DTC P0A81-11: Hybrid/EV Battery Cooling Fan 1 Circuit Short to Ground; DTC P0A81-4B: Hybrid/EV Battery Cooling Fan 1 Over Temperature [11/2020 - 12/2022]: Procedure

Pre-procedure1

• None.

• Check for DTCs.

  Powertrain > EV Battery > Trouble Codes 

  Powertrain > EV > Trouble Codes 

  Result

  Result	Proceed to
  Only P0A81-11 or P0A81-4B for Hybrid battery system is output	A
  P0A81-11 or P0A81-4B is output and DTCs other than the DTCs in the table below are output	B
  P0A81-11 or P0A81-4B is output and Hybrid battery system DTCs in the table below are output	C
  P0A81-11 or P0A81-4B is output and Hybrid control system DTCs in the table below are output	D

  System	Relevant DTC
  Hybrid battery system	P060A-47	Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure
  	P060B-49	Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure
  	P0606-87	Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message
  Hybrid control system	P0A1F-94	Hybrid/EV Battery Energy Control Module Unexpected Operation

Post-procedure1

• Turn the ignition switch off.

Result: 

B 

See step  2

Result: 

C 

GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2020 - 12/2022] 

Result: 

D 

GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2020 - 12/2022] 

Result: 

A 

See step  2

Pre-procedure1

• Clear the DTCs and freeze frame data.

  Powertrain > EV Battery > Clear DTCs 

• Select air volume mode 6 in the "Control the Hybrid/EV Battery Cooling Fan" Active Test to operate the battery cooling blower assembly.

  Powertrain > EV Battery > Active Test 

  Tester Display	Measurement Item	Control Range	Restrict Condition
  Control the Hybrid/EV Battery Cooling Fan	Battery cooling blower assembly operation and blower volume can be checked.	OFF, 1, 2, 3, 4, 5, 6	Intake air temperature -10°C (14°F) or higher

  Powertrain > EV Battery > Active Test 

  Tester Display
  Control the Hybrid/EV Battery Cooling Fan

  NOTE:

  If the Active Test cannot be performed, skip it and proceed to the next step to check if the fan operates and air is sucked. In accordance with fail-safe system operation, the battery ECU assembly sends a command to operate the battery cooling blower assembly.

• Check that the battery cooling blower assembly operates, air is sucked into the inlet duct and the operation sound is normal.

  HINT: 

  The battery cooling blower assembly may not stop even when turning the cooling fan off in the "Control the Hybrid/EV Battery Cooling Fan" Active Test. This is due to HV system control and is not a malfunction.

  OK

  The battery cooling blower assembly operates.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.

Result: 

NG 

See step  9

Result: 

OK 

See step  3

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the G156 No. 2 EV battery pack wire connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

• Disconnect the G31 battery cooling blower assembly connector.
  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

• Measure the resistance according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (No. 2 EV Battery Pack Wire Connector)
  *b	Front view of wire harness connector (to Battery Cooling Blower Assembly)

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  G156-12 (FP0) - G31-2 (FP0)	Ignition switch off	Below 1 Ω	Ω
  G156-12 (FP0) or G31-2 (FP0) - Body ground and other terminals	Ignition switch off	10 kΩ or higher	kΩ

• Connect the cable to the negative (-) auxiliary battery terminal.
• Turn the ignition switch to ON.
• Measure the voltage according to the value(s) in the table below.

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  G156-12 (FP0) - G31-2 (FP0) - Body ground	Ignition switch ON	Below 1 V	V

  NOTE:

  • Turning the ignition switch to ON with the service plug grip and FC converter power outlet cable removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
  • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.
• Disconnect the cable from the negative (-) auxiliary battery terminal.
• Reconnect the G31 battery cooling blower assembly connector.
• Reconnect the G156 No. 2 EV battery pack wire connector.
• Install the center No. 2 floor to brace extension.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Connect the cable to the negative (-) auxiliary battery terminal.
• Clear the DTCs and freeze frame data.

  Powertrain > EV Battery > Clear DTCs 

• Select each air volume mode (1 to 6) in the "Control the Hybrid/EV Battery Cooling Fan" Active Test to operate the battery cooling blower assembly.

  Powertrain > EV Battery > Active Test 

  Tester Display	Measurement Item	Control Range	Restrict Condition
  Control the Hybrid/EV Battery Cooling Fan	Battery cooling blower assembly operation and blower volume can be checked.	OFF, 1, 2, 3, 4, 5, 6	Intake air temperature -10°C (14°F) or higher

  Powertrain > EV Battery > Active Test 

  Active Test Display
  Control the Hybrid/EV Battery Cooling Fan

  Data List Display
  Hybrid/EV Battery Cooling Fan 1 Frequency

  NOTE:

  If the Active Test cannot turn off the battery cooling blower assembly, skip it and proceed to the next step to check the frequency value. In accordance with fail-safe system operation, the battery ECU assembly sends a command to operate the battery cooling fan assembly.

• While the cooling fan is operating, compare the value in the Data List (Hybrid/EV Battery Cooling Fan 1 Frequency) with the frequency value that was actually measured at the battery ECU assembly connector.

  Specified Condition

  Tester Connection	Condition
  G156-12 (FP0) - G156-1 (GND)	Battery cooling blower assembly is operating.

  NOTE:

  Turning the ignition switch to ON with the service plug grip and FC converter power outlet cable removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Component with harness connected (No. 2 EV Battery Pack Wire Connector)

  HINT: 

  Compare the values in each air volume mode (1 to 6). If the Active Test cannot be performed, compare the values only in the current air volume mode.

  Result

  Result	Proceed to
  Both of the value in the Data List (Hybrid/EV Battery Cooling Fan 1 Frequency) and the actual measured value at the battery ECU assembly connector are 0 Hz.	A
  Other than above	B

Post-procedure1

• Turn the ignition switch off.
• Disconnect the cable from the negative (-) auxiliary battery terminal.
• Install the center No. 2 floor to brace extension.

Result: 

B 

See step  7

Result: 

A 

See step  5

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the G31 battery cooling blower assembly connector.
  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• Connect the cable to the negative (-) auxiliary battery terminal.
• Turn the ignition switch to ON.

• Measure the voltage according to the value(s) in the table below.

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  G31-2 (FP0) - G31-4 (GND0)	Ignition switch ON	4.5 to 5.5 V	V

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to Battery Cooling Blower Assembly)

  NOTE:

  • Turning the ignition switch to ON with the service plug grip and FC converter power outlet cable removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
  • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.
• Disconnect the cable from the negative (-) auxiliary battery terminal.
• Reconnect the G31 battery cooling blower assembly connector.
• Install the center No. 2 floor to brace extension.

Result: 

OK 

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

Result: 

NG 

See step  6

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the upper No. 1 EV battery cover sub-assembly.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the z26 battery ECU assembly connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

• Measure the resistance according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (No. 2 EV Battery Pack Wire Connector)
  *b	Rear view of wire harness connector (to Battery ECU Assembly)

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  G156-12 (FP0) - z26-32 (FP0)	Always	Below 1 Ω	Ω
  G156-12 (FP0) or z26-32 (FP0) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the z26 battery ECU assembly connector.
• Install the upper No. 1 EV battery cover sub-assembly.

Result: 

OK 

REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Connect the cable to the negative (-) auxiliary battery terminal.
• Clear the DTCs and freeze frame data.

  Powertrain > EV Battery > Clear DTCs 

• Select each air volume mode (1 to 6) in the "Control the Hybrid/EV Battery Cooling Fan" Active Test to operate the battery cooling blower assembly.

  Powertrain > EV Battery > Active Test 

  Tester Display	Measurement Item	Control Range	Restrict Condition
  Control the Hybrid/EV Battery Cooling Fan	Battery cooling blower assembly operation and blower volume can be checked.	OFF, 1, 2, 3, 4, 5, 6	Intake air temperature -10°C (14°F) or higher

  Powertrain > EV Battery > Active Test 

  Active Test Display
  Control the Hybrid/EV Battery Cooling Fan

  Data List Display
  Hybrid/EV Battery Cooling Fan 1 Frequency

  NOTE:

  If the Active Test cannot turn off the battery cooling blower assembly, skip it and proceed to the next step to check the frequency value. In accordance with fail-safe system operation, the battery ECU assembly sends a command to operate the battery cooling blower assembly.

• While the cooling fan is operating, compare the value in the Data List (Hybrid/EV Battery Cooling Fan 1 Frequency) with the frequency value that was actually measured at the battery ECU assembly connector.

  Specified Condition

  Tester Connection	Condition	Specified Condition
  G156-12 (FP0) - G156-1 (GND)	Battery cooling blower assembly is operating.	Difference between the value in the Data List (Hybrid/EV Battery Cooling Fan 1 Frequency) and the actual measured value at the battery ECU assembly connector is 10% or less.

  NOTE:

  Turning the ignition switch to ON with the service plug grip and FC converter power outlet cable removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Component with harness connected (No. 2 EV Battery Pack Wire Connector)

  HINT: 

  Compare the values in each air volume mode (1 to 6). If the Active Test cannot be performed, compare the values only in the current air volume mode.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.
• Disconnect the cable from the negative (-) auxiliary battery terminal.
• Install the center No. 2 floor to brace extension.

Result: 

OK 

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

Result: 

NG 

See step  8

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the upper No. 1 EV battery cover sub-assembly.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the z26 battery ECU assembly connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

• Measure the resistance according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (No. 2 EV Battery Pack Wire Connector)
  *b	Rear view of wire harness connector (to Battery ECU Assembly)

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  G156-12 (FP0) - z26-32 (FP0)	Always	Below 1 Ω	Ω
  G156-12 (FP0) or z26-32 (FP0) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the z26 battery ECU assembly connector.
• Install the upper No. 1 EV battery cover sub-assembly.

Result: 

OK 

REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Pre-procedure1

• Remove the BATT FAN fuse from the luggage room relay block assembly.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	Luggage Room Relay Block Assembly
  *a	BATT FAN Fuse

• Measure the resistance of the BATT FAN fuse.

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  BATT FAN fuse terminals 1 - 2	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the BATT FAN fuse to the luggage room relay block assembly.

Result: 

NG 

See step  20

Result: 

OK 

See step  10

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the G31 battery cooling blower assembly connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

• Connect the cable to the negative (-) auxiliary battery terminal.
• Clear the DTCs and freeze frame data.

  Powertrain > EV Battery > Clear DTCs 

• Measure the voltage according to the value(s) in the table below.

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  G31-1 (IG0) - G31-4 (GND0)	Ignition switch ON	11 to 14 V	V

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to Battery Cooling Blower Assembly)

  NOTE:

  • Turning the ignition switch to ON with the service plug grip and FC converter power outlet cable removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
  • Turning the ignition switch to ON with the connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

  HINT: 

  As there might be an intermittent malfunction, inspect the following items even if the measured voltage is as specified.

  • Installation condition of fuse(s) (before removing fuse(s)) (IG circuit)
  • Fuse condition (before and after removing fuse(s)) (IG circuit)
  • Connection condition of connectors (IG circuit)
  • Wire harness condition (IG circuit)
  • Wire harness condition (GND circuit)

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.
• Disconnect the cable from the negative (-) auxiliary battery terminal.
• Connect the G31 battery cooling blower assembly connector.
• Install the center No. 2 floor to brace extension.

Result: 

NG 

See step  16

Result: 

OK 

See step  11

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the G156 No. 2 EV battery pack wire connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

• Disconnect the G31 battery cooling blower assembly connector.
  NOTE:

  • Before disconnecting the connector, check that it is not loose or disconnected.

  • Check the terminals of the connector for deformation and corrosion.

• Measure the resistance according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (No. 2 EV Battery Pack Wire Connector)
  *b	Front view of wire harness connector (to Battery Cooling Blower Assembly)

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  G156-3 (SI0) - G31-3 (SI0)	Ignition switch off	Below 1 Ω	Ω
  G156-3 (SI0) or G31-3 (SI0) - Body ground and other terminals	Ignition switch off	10 kΩ or higher	kΩ

• Connect the cable to the negative (-) auxiliary battery terminal.
• Turn the ignition switch to ON.
• Measure the voltage according to the value(s) in the table below.

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  G156-3 (SI0) or G31-3 (SI0) - Body ground	Ignition switch ON	Below 1 V	V

  NOTE:

  • Turning the ignition switch to ON with the service plug grip and FC converter power outlet cable removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
  • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.
• Disconnect the cable from the negative (-) auxiliary battery terminal.
• Reconnect the G31 battery cooling blower assembly connector.
• Reconnect the G156 No. 2 EV battery pack wire connector.
• Install the center No. 2 floor to brace extension.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  12

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Connect the cable to the negative (-) auxiliary battery terminal.
• Turn the ignition switch to ON.

• Measure the voltage according to the value(s) in the table below.

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  G156-3 (SI0) - G156-1 (GND)	Ignition switch ON	4.5 to 5.5 V	V

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Component with harness connected (No. 2 EV Battery Pack Wire Connector)

  NOTE:

  Turning the ignition switch to ON with the service plug grip and FC converter power outlet cable removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.
• Disconnect the cable from the negative (-) auxiliary battery terminal.
• Install the center No. 2 floor to brace extension.

Result: 

NG 

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

Result: 

OK 

See step  13

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Connect the cable to the negative (-) auxiliary battery terminal.
• Clear the DTCs and freeze frame data.

  Powertrain > EV Battery > Clear DTCs 

• Select each air volume mode (1 to 6) in the "Control the Hybrid/EV Battery Cooling Fan" Active Test to operate the battery cooling blower assembly.

  Powertrain > EV Battery > Active Test 

  Tester Display	Measurement Item	Control Range	Restrict Condition
  Control the Hybrid/EV Battery Cooling Fan	Battery cooling blower assembly operation and blower volume	OFF, 1, 2, 3, 4, 5, 6	Intake air temperature -10°C (14°F) or higher

  Powertrain > EV Battery > Active Test 

  Tester Display
  Control the Hybrid/EV Battery Cooling Fan

  NOTE:

  If the Active Test cannot turn off the battery cooling blower assembly, skip it and proceed to the next step to check the waveform. In accordance with fail-safe system operation, the battery ECU assembly sends a command to operate the battery cooling blower assembly.

• Connect an oscilloscope to the G156 No. 2 EV battery pack wire connector and check the waveform.

  Item	Content
  Tester Connection	G156-3 (SI0) - G156-1 (GND)
  Equipment Setting	10 V/DIV., 1 ms./DIV.
  Condition	Ignition switch ON, during Active Test

  NOTE:

  Turning the ignition switch to ON with the service plug grip and FC converter power outlet cable removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

  HINT: 

  • Perform this inspection with the No. 2 EV battery pack wire connector connected.
  • The wave length will vary with the operating speed of the battery cooling blower assembly.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Component with harness connected (No. 2 EV Battery Pack Wire Connector)

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Waveform 1

  Result

  Result	Proceed to
  Normal (The pulse output of waveform 1)	A
  No pulse generation	B

Post-procedure1

• Turn the ignition switch off.
• Disconnect the cable from the negative (-) auxiliary battery terminal.
• Install the center No. 2 floor to brace extension.

Result: 

A 

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

Result: 

B 

See step  14

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the upper No. 1 EV battery cover sub-assembly.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the z26 battery ECU assembly connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

• Measure the resistance according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (No. 2 EV Battery Pack Wire Connector)
  *b	Rear view of wire harness connector (to Battery ECU Assembly)

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  G156-3 (SI0) - z26-33 (SI0)	Always	Below 1 Ω	Ω
  G156-3 (SI0) or z26-33 (SI0) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the z26 battery ECU assembly connector.
• Install the upper No. 1 EV battery cover sub-assembly.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  15

Pre-procedure1

• Remove the upper No. 1 EV battery cover sub-assembly.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the z26 battery ECU assembly connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  z26-33 (SI0) - z26-11 (GND)	Always	10 kΩ or higher	kΩ
  z26-33 (SI0) - z26-31 (GND1)	Always	10 kΩ or higher	kΩ

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Component without harness connected (Battery ECU Assembly)

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the z26 battery ECU assembly connector.
• Install the upper No. 1 EV battery cover sub-assembly.

Result: 

OK 

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

Result: 

NG 

REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the G31 battery cooling blower assembly connector.
  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  G31-4 (GND0) - Body ground	Ignition switch off	Below 1 Ω	Ω

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to Battery Cooling Blower Assembly)

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Connect the G31 battery cooling blower assembly connector.
• Install the center No. 2 floor to brace extension.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  17

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the G156 No. 2 EV battery pack wire connector.
  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  G156-1 (GND) - Body ground	Ignition switch off	Below 1 Ω	Ω
  G156-10 (GND1) - Body ground	Ignition switch off	Below 1 Ω	Ω

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (No. 2 EV Battery Pack Wire Connector)

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the G156 No. 2 EV battery pack wire connector.
• Install the center No. 2 floor to brace extension.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  18

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the G31 battery cooling blower assembly connector.
  NOTE:

  • Before disconnecting the connector, check that it is not loose or disconnected.
  • Check that each connector between the BATT FAN relay and battery cooling blower assembly is not loose or disconnected.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• Remove the BATT FAN relay from the luggage room relay block assembly.
  NOTE:

  Check the relay for deformation and corrosion.

• Measure the resistance according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	Luggage Room Relay Block Assembly	-	-
  *a	Front view of wire harness connector (to Battery Cooling Blower Assembly)	*b	BATT FAN Relay Holder

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  G31-1 (IG0) - 5 (BATT FAN relay holder)	Ignition switch off	Below 1 Ω	Ω

  NOTE:

  • When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.
  • Make sure that each connector between the battery cooling blower assembly and BATT FAN relay holder is not loose or disconnected and its terminals are not deformed or corroded.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the BATT FAN relay to the luggage room relay block assembly.
• Reconnect the G31 battery cooling blower assembly connector.
• Install the center No. 2 floor to brace extension.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  19

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the upper No. 1 EV battery cover sub-assembly.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the z26 battery ECU assembly connector.
  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  z26-11 (GND) - Body ground	Always	Below 1 Ω	Ω
  z26-31 (GND1) - Body ground	Always	Below 1 Ω	Ω

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Rear view of wire harness connector (to Battery ECU Assembly)

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the z26 battery ECU assembly connector.
• Install the upper No. 1 EV battery cover sub-assembly.

Result: 

OK 

REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the G31 battery cooling blower assembly connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

• Remove the BATT FAN fuse from the luggage room relay block assembly.

• Measure the resistance according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	Luggage Room Relay Block Assembly	-	-
  *a	Front view of wire harness connector (to Battery Cooling Blower Assembly)	*b	BATT FAN Fuse Holder

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  G31-1 (IG0) - Terminals other than 2 (BATT FAN fuse holder) and body ground	Ignition switch off	10 kΩ or higher	kΩ

  NOTE:

  When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the BATT FAN fuse to the luggage room relay block assembly.
• Reconnect the G31 battery cooling blower assembly connector.
• Install the center No. 2 floor to brace extension.

Result: 

NG 

See step  23

Result: 

OK 

See step  21

Pre-procedure1

• Check that the service plug grip and FC converter power outlet cable are not installed.
  NOTE:

  After removing the service plug grip and FC converter power outlet cable, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

• Remove the center No. 2 floor to brace extension.

  HINT: 

  Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

• Disconnect the G31 battery cooling blower assembly connector.
  NOTE:

  Before disconnecting the connector, check that it is not loose or disconnected.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  G31-1 (IG0) - G31-4 (GND0) and Body ground	Always	10 kΩ or higher	kΩ

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Component without harness connected (Battery Cooling Blower Assembly)

  NOTE:

  When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the G31 battery cooling blower assembly connector.
• Install the center No. 2 floor to brace extension.

Result: 

OK 

REPLACE FUSE (BATT FAN) 

Result: 

NG 

See step  22

HINT: 

Refer to REMOVAL [11/2020 - 11/2021] , or refer to REMOVAL [11/2021 - 12/2022]

Result

Result: 

NEXT 

REPLACE FUSE (BATT FAN) 

Result

Result: 

NEXT 

REPLACE FUSE (BATT FAN)