DTC P0A81-11: Hybrid/EV Battery Cooling Fan 1 Circuit Short to Ground [08/2020 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, and 2021 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / HV Battery and Hybrid Control / Trouble Codes.

Check for DTCs.

Powertrain > HV Battery > Trouble Codes

Powertrain > Hybrid Control > Trouble Codes

Result

Result	Proceed to
P0A81-11 only is output, or DTCs except the ones in the table below are also output.	A
DTCs of hybrid battery system in the table below are output.	B
DTCs of hybrid control system in the table below are output.	C

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

Turn the power switch off.

Result:

GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2020 - ]

Result:

GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2020 - 08/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2021 - ]

Result:

See step 2

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE HYBRID/EV BATTERY COOLING FAN)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / HV Battery / Trouble Codes.
Clear the DTCs and freeze frame data.
Powertrain > HV Battery > Clear DTCs
Enter the following menus: Powertrain / HV Battery / Active Test / Control the Hybrid/EV Battery Cooling Fan.

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

Powertrain > HV Battery > Active Test

Tester Display	Measurement Item	Control Range	Restrict Condition
Control the Hybrid/EV Battery Cooling Fan	Change the battery cooling blower assembly operation and blower volume.	0, 1, 2, 3, 4, 5, 6	Intake air temperature -10°C (14°F) or higher

Powertrain > HV 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.

Turn the power switch off.

Result

Proceed to
OK
NG

Result:

See step 7

Result:

See step 3

CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - BATTERY COOLING BLOWER ASSEMBLY)

WARNING:

Be sure to wear insulated gloves and protective goggles.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the No. 1 HV battery hose.
Refer to PROCEDURE - Step 21 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 21 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 21 [09/2022 - ]

Disconnect the y16 battery ECU assembly connector.

NOTE:

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the N24 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.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Condition	Specified Condition
N24-1 (FP0) - y16-15 (FP0)	Power switch off	Below 1 Ω
y16-15 (FP0) - Body ground and other terminals	Power switch off	10 kΩ or higher

Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).

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

Standard Voltage

Tester Connection	Condition	Specified Condition
y16-15 (FP0) - Body ground	Power switch on (IG)	Below 1 V

NOTE:

Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
If the power switch is turned on (IG) with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

HINT:

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

Check the condition of each wire harness and each connector between the battery ECU assembly connector and battery cooling blower assembly.

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Reconnect the N24 battery cooling blower assembly connector.
Reconnect the y16 battery ECU assembly connector.

Install the No. 1 HV battery hose.

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 4

READ VALUE USING TECHSTREAM (HYBRID/EV BATTERY COOLING FAN 1 FREQUENCY)

WARNING:

Be sure to wear insulated gloves and protective goggles.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the No. 4 HV battery protector.
Refer to PROCEDURE - Step 18 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 18 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 18 [09/2022 - ]
Connect the cable to the negative (-) auxiliary battery terminal.
Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / HV Battery / Trouble Codes.
Clear the DTCs and freeze frame data.
Powertrain > HV Battery > Clear DTCs
Enter the following menus: Powertrain / HV Battery / Active Test / Control the Hybrid/EV Battery Cooling Fan / Data List / Hybrid/EV Battery Cooling Fan 1 Frequency.

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

Powertrain > HV Battery > Active Test

Tester Display	Measurement Item	Control Range	Restrict Condition
Control the Hybrid/EV Battery Cooling Fan	Change the battery cooling blower assembly operation and blower volume.	0, 1, 2, 3, 4, 5, 6	Intake air temperature -10°C (14°F) or higher

Powertrain > HV 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
N122-14 (FP0) - N122-4 (GND)	Battery cooling blower assembly operating (Active Test of cooling fan being performed)

NOTE:

Turning the power switch on (IG) with the service plug grip 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 (Battery ECU Assembly)

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

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Install the No. 4 HV battery protector.

Result:

See step 6

Result:

See step 5

CHECK BATTERY ECU ASSEMBLY

WARNING:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the rear seat cushion leg sub-assembly.
Refer to PROCEDURE - Step 8

Disconnect the N24 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 power switch on (IG).

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

Standard Voltage

Tester Connection	Condition	Specified Condition
N24-1 (FP0) - N24-3 (GND0)	Power switch on (IG)	4.5 to 5.5 V

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

NOTE:

Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
If the power switch is turned on (IG) with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Reconnect the N24 battery cooling blower assembly connector.

Install the rear seat cushion leg sub-assembly.

Result

Proceed to
OK
NG

Result:

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to REMOVAL [06/2018 - ]

Result:

REPLACE BATTERY ECU ASSEMBLY. Refer to REMOVAL [08/2020 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

CHECK BATTERY ECU ASSEMBLY (FREQUENCY)

WARNING:

Be sure to wear insulated gloves and protective goggles.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the No. 4 HV battery protector.
Refer to PROCEDURE - Step 18 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 18 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 18 [09/2022 - ]
Connect the cable to the negative (-) auxiliary battery terminal.
Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / HV Battery / Trouble Codes.
Clear the DTCs and freeze frame data.
Powertrain > HV Battery > Clear DTCs
Enter the following menus: Powertrain / HV Battery / Active Test / Control the Hybrid/EV Battery Cooling Fan / Data List / Hybrid/EV Battery Cooling Fan 1 Frequency.

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

Powertrain > HV Battery > Active Test

Tester Display	Measurement Item	Control Range	Restrict Condition
Control the Hybrid/EV Battery Cooling Fan	Change the battery cooling blower assembly operation and blower volume.	0, 1, 2, 3, 4, 5, 6	Intake air temperature -10°C (14°F) or higher

Powertrain > HV Battery > Active Test

Active Test Display
Control the Hybrid/EV Battery Cooling Fan

Data List Display
Hybrid/EV Battery Cooling Fan 1 Frequency

NOTE:

Specified Condition

Tester Connection	Condition	Specified Condition
N122-14 (FP0) - N122-4 (GND)	Battery cooling blower assembly operating (Active Test of cooling fan being performed)	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 power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

HINT:

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Component with harness connected (Battery ECU Assembly)

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.

Install the No. 4 HV battery protector.

Result

Proceed to
OK
NG

Result:

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to REMOVAL [06/2018 - ]

Result:

REPLACE BATTERY ECU ASSEMBLY. Refer to REMOVAL [08/2020 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

CHECK FUSE (BATT FAN)

Remove the BATT FAN fuse from the No. 4 relay block.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	No. 4 Relay Block
*2	BATT FAN Fuse

Measure the resistance of the BATT FAN fuse.

Standard Resistance

Tester Connection	Condition	Specified Condition
BATT FAN fuse	Power switch off	Below 1 Ω

Install the BATT FAN fuse.

Result

Proceed to
OK
NG

Result:

See step 17

Result:

See step 8

CHECK HARNESS AND CONNECTOR (IGCT RELAY - BATTERY COOLING BLOWER ASSEMBLY) (VOLTAGE)

WARNING:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the rear seat cushion leg sub-assembly.
Refer to PROCEDURE - Step 8

Disconnect the N24 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.
Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
Clear the DTCs and freeze frame data.
Powertrain > Hybrid Control > Clear DTCs

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

Standard Voltage

Tester Connection	Condition	Specified Condition
N24-2 (IG0) - N24-3 (GND0)	Power switch on (IG)	11 to 14 V

NOTE:

Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
If the power switch is turned on (IG) with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the 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)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Reconnect the N24 battery cooling blower assembly connector.

Install the rear seat cushion leg sub-assembly.

Result

Proceed to
OK
NG

Result:

See step 13

Result:

See step 9

CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - BATTERY COOLING BLOWER ASSEMBLY)

WARNING:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the No. 1 HV battery hose.
Refer to PROCEDURE - Step 21 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 21 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 21 [09/2022 - ]

Disconnect the y16 battery ECU assembly connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE:

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

Disconnect the N24 battery cooling blower assembly connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

Tester Connection	Condition	Specified Condition
y16-14 (SI0) - N24-4 (SI0)	Power switch off	Below 1 Ω
N24-4 (SI0) - Body ground and other terminals	Power switch off	10 kΩ or higher

NOTE:

Make sure that each connector between the battery ECU assembly and battery cooling blower assembly is not loose or disconnected and its terminals are not deformed or corroded.

Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).

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

Standard Voltage

Tester Connection	Condition	Specified Condition
N24-4 (SI0) - Body ground	Power switch on (IG)	Below 1 V

NOTE:

Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
If the power switch is turned on (IG) with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

HINT:

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

Check the condition of each wire harness and each connector between the battery ECU assembly connector and battery cooling blower assembly.

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Reconnect the N24 battery cooling blower assembly connector.
Reconnect the y16 battery ECU assembly connector.

Install the No. 1 HV battery hose.

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 10

CHECK BATTERY ECU ASSEMBLY

Remove the battery ECU assembly.
Refer to REMOVAL [08/2020 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Component without harness connected
(Battery ECU Assembly)

Standard Resistance

Tester Connection	Condition	Specified Condition
y16-14 (SI0) -y16-27 (GND)	Power switch off	10 kΩ or higher

Install the battery ECU assembly.

Result

Proceed to
OK
NG

Result:

REPLACE BATTERY ECU ASSEMBLY. Refer to REMOVAL [08/2020 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

Result:

See step 11

CHECK BATTERY ECU ASSEMBLY (SI0 VOLTAGE)

WARNING:

Be sure to wear insulated gloves and protective goggles.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the No. 4 HV battery protector.
Refer to PROCEDURE - Step 18 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 18 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 18 [09/2022 - ]
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).

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

Standard Voltage

Tester Connection	Condition	Specified Condition
N122-12 (SI0) -N122-4 (GND)	Power switch on (IG)	4.5 to 5.5 V

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Component with harness connected (Battery ECU Assembly)

NOTE:

Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.

Install the No. 4 HV battery protector.

Result

Proceed to
OK
NG

Result:

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to REMOVAL [06/2018 - ]

Result:

See step 12

CHECK BATTERY COOLING BLOWER ASSEMBLY

WARNING:

Be sure to wear insulated gloves and protective goggles.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the No. 4 HV battery protector.
Refer to PROCEDURE - Step 18 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 18 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 18 [09/2022 - ]
Connect the cable to the negative (-) auxiliary battery terminal.
Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / HV Battery / Trouble Codes.
Clear the DTCs and freeze frame data.
Powertrain > HV Battery > Clear DTCs
Enter the following menus: Powertrain / HV Battery / Active Test / Control the Hybrid/EV Battery Cooling Fan.

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

Powertrain > HV Battery > Active Test

Tester Display	Measurement Item	Control Range	Restrict Condition
Control the Hybrid/EV Battery Cooling Fan	Change the battery cooling blower assembly operation and blower volume.	0, 1, 2, 3, 4, 5, 6	Intake air temperature -10°C (14°F) or higher

Powertrain > HV 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 N122 battery ECU assembly connector and check the waveform.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Component with harness connected (Battery ECU Assembly)

Item	Content
Tester Connection	N122-12 (SI0) - N122-4 (GND)
Equipment Setting	10 V/DIV., 1 ms./DIV.
Condition	Battery cooling blower assembly operating (Active Test of cooling fan being performed)

NOTE:

Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

HINT:

Perform this inspection with the battery ECU assembly connector connected.
The wave length will vary with the operating speed of the battery cooling blower assembly.

Result

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

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.

Install the No. 4 HV battery protector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Waveform 1

Result:

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to REMOVAL [06/2018 - ]

Result:

REPLACE BATTERY ECU ASSEMBLY. Refer to REMOVAL [08/2020 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

CHECK HARNESS AND CONNECTOR (BATTERY COOLING BLOWER ASSEMBLY - BODY GROUND)

WARNING:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the rear seat cushion leg sub-assembly.
Refer to PROCEDURE - Step 8

Disconnect the N24 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
N24-3 (GND0) - Body ground	Power switch off	Below 1 Ω

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

Connect the N24 battery cooling blower assembly connector.

Install the rear seat cushion leg sub-assembly.

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 14

CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - BODY GROUND)

WARNING:

Be sure to wear insulated gloves and protective goggles.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the No. 1 HV battery hose.
Refer to PROCEDURE - Step 21 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 21 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 21 [09/2022 - ]

Disconnect the y16 battery ECU 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.

Standard Resistance

Tester Connection	Condition	Specified Condition
y16-27 (GND) - Body ground	Power switch off	Below 1 Ω

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

Reconnect the y16 battery ECU assembly connector.

Install the No. 1 HV battery hose.

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 15

CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - BODY GROUND)

WARNING:

Be sure to wear insulated gloves and protective goggles.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the No. 1 HV battery hose.
Refer to PROCEDURE - Step 21 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 21 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 21 [09/2022 - ]

Disconnect the y16 battery ECU 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.

Standard Resistance

Tester Connection	Condition	Specified Condition
y16-3 (GND1) - Body ground	Power switch off	Below 1 Ω

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

Reconnect the y16 battery ECU assembly connector.

Install the No. 1 HV battery hose.

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 16

CHECK HARNESS AND CONNECTOR (IGCT RELAY - BATTERY COOLING BLOWER ASSEMBLY)

WARNING:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the IGCT relay from the No. 3 relay block.
NOTE:
Check the terminals of the relay for deformation and corrosion.
Remove the rear seat cushion leg sub-assembly.
Refer to PROCEDURE - Step 8

Disconnect the N24 battery cooling blower assembly connector.

NOTE:

Check that each connector between the IGCT relay and battery cooling blower assembly is not loose or disconnected.
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
IGCT relay holder 5 - N24-2 (IG0)	Power switch off	Below 1 Ω

NOTE:

When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.
Check that each connector between the IGCT relay and battery cooling blower assembly is not loose or disconnected.

*1	No. 3 Relay Block
*2	IGCT Relay Holder
*a	Front view of wire harness connector (to Battery Cooling Blower Assembly)

Reconnect the N24 battery cooling blower assembly connector.
Install the rear seat cushion leg sub-assembly.

Install the IGCT relay.

Result

Proceed to
OK
NG

Result:

REPLACE BATTERY ECU ASSEMBLY. Refer to REMOVAL [08/2020 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (BATT FAN FUSE - BATTERY COOLING BLOWER ASSEMBLY)

WARNING:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the BATT FAN fuse from the No. 4 relay block.
Remove the rear seat cushion leg sub-assembly.
Refer to PROCEDURE - Step 8

Disconnect the N24 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.

Standard Resistance

Tester Connection	Condition	Specified Condition
N24-2 (IG0) - Terminals other than 2 (BATT FAN fuse holder) and body ground	Power switch off	10 kΩ or higher

NOTE:

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

*1	No. 4 Relay Block
*2	BATT FAN Fuse Holder
*a	Front view of wire harness connector (to Battery Cooling Blower Assembly)

Reconnect the N24 battery cooling blower assembly connector.
Install the rear seat cushion leg sub-assembly.

Install the BATT FAN fuse.

Result

Proceed to
OK
NG

Result:

See step 20

Result:

See step 18

CHECK BATTERY COOLING BLOWER ASSEMBLY

WARNING:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the rear seat cushion leg sub-assembly.
Refer to PROCEDURE - Step 8

Disconnect the N24 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.

Standard Resistance

Tester Connection	Condition	Specified Condition
N24-2 (IG0) - N24-3 (GND0) and Body ground	Power switch off	10 kΩ or higher

*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.

Reconnect the N24 battery cooling blower assembly connector.

Install the rear seat cushion leg sub-assembly.

Result

Proceed to
OK
NG

Result:

REPLACE FUSE (BATT FAN)

Result:

See step 19

REPLACE BATTERY COOLING BLOWER ASSEMBLY
Refer to REMOVAL [06/2018 - ]

Result

Proceed to

NEXT

Result:

NEXT

REPLACE FUSE (BATT FAN)
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result

Proceed to

NEXT

Result:

NEXT

REPLACE FUSE (BATT FAN)