DTC P0A81-11: Hybrid/EV Battery Cooling Fan 1 Circuit Short to Ground [11/2015 - 12/2018]: Procedure

CHECK DTC OUTPUT (HYBRID CONTROL)

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

Check for DTCs.

Result

Result	Proceed to
P0AFC-00 or P0AFC-96 is output	A
Other than above	B

Turn the power switch off.

Result:

GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2015 - 11/2017] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2017 - 12/2018]

Result:

See step 2

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

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

Enter the following menus: Powertrain / Hybrid Control / Active Test / Control the Hybrid Battery Cooling Fan.

Powertrain > Hybrid Control > Active Test

Active Test Display
Control the Hybrid Battery Cooling Fan

Data List Display
Hybrid Battery Cooling Fan

Powertrain > Hybrid Control > Active Test

Tester Display	Measurement Item	Control Range	Restrict Condition
Control the Hybrid 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

Select air volume mode 6 in the "Control the Hybrid Battery Cooling Fan" Active Test to operate the battery cooling blower assembly.
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 hybrid vehicle control ECU 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 Battery Cooling Fan" Active Test. This is due to HV system control and is not a malfunction.

Battery cooling blower assembly operates

Result

Proceed to
OK
NG

Turn the power switch off.

Result:

See step 7

Result:

See step 3

CHECK HARNESS AND CONNECTOR (BATTERY VOLTAGE SENSOR - 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 repair information because this may cause a malfunction.
Remove the No. 1 HV battery shield panel.
HINT:

Refer to PROCEDURE - Step 35
Disconnect the M35 battery voltage sensor connector.
HINT:

Refer to PROCEDURE - Step 36

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

Disconnect the M38 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	Rear view of wire harness connector (to Battery Voltage Sensor)
*b	Front view of wire harness connector (to Battery Cooling Blower Assembly)

Standard Resistance

(M35, M38)

(M35)

(M38)

Tester Connection	Condition	Specified Condition
M35-8 (FP0) - M38-1 (FP0)	Power switch off	Below 1 Ω
M35-8 (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

(M35)

Tester Connection	Condition	Specified Condition
M35-8 (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 voltage sensor connector and battery cooling blower assembly.

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Reconnect the M38 battery cooling blower assembly connector.
Reconnect the M35 battery voltage sensor connector.

Install the No. 1 HV battery shield panel.

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 4

READ VALUE USING TECHSTREAM (COOLING FAN FREQUENCY)

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 repair information because this may cause a malfunction.
Remove the No. 1 HV battery shield panel.
HINT:

Refer to PROCEDURE - Step 35
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.
Powertrain > Hybrid Control > Clear DTCs

Enter the following menus: Powertrain / Hybrid Control / Active Test / Control the Hybrid Battery Cooling Fan.

Powertrain > Hybrid Control > Active Test

Active Test Display
Control the Hybrid Battery Cooling Fan

Data List Display
Hybrid Battery Cooling Fan
Hybrid Battery Cooling Fan 1 Frequency

Powertrain > Hybrid Control > Active Test

Tester Display	Measurement Item	Control Range	Restrict Condition
Control the Hybrid 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

Enter the following menus: Powertrain / Hybrid Control / Data List / Hybrid Battery Cooling Fan 1 Frequency.
Select each air volume mode 1 to 6 in the "Control the Hybrid Battery Cooling Fan" Active Test to operate the battery cooling blower assembly.
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 hybrid vehicle control ECU sends a command to operate the battery cooling fan assembly.

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

Specified Condition

(M35)

Tester Connection	Condition
M35-8 (FP0) - M35-5 (GND)	Battery cooling blower assembly is operating.

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 Voltage Sensor)

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 Battery Cooling Fan 1 Frequency) and the actual measured value at the battery voltage sensor 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. 1 HV battery shield panel.

Result:

See step 6

Result:

See step 5

CHECK BATTERY VOLTAGE SENSOR

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 repair information because this may cause a malfunction.
Remove the rear seat cushion assembly.
HINT:

Refer to PROCEDURE - Step 7

Disconnect the M38 battery cooling bower 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

(M38)

Tester Connection	Condition	Specified Condition
M38-1 (FP0) - M38-3 (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 M38 battery cooling blower assembly connector.

Install the rear seat cushion assembly.

Result

Proceed to
OK
NG

Result:

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to REMOVAL [11/2015 -]

Result:

REPLACE BATTERY VOLTAGE SENSOR. Refer to REMOVAL [11/2015 - 12/2018]

CHECK BATTERY VOLTAGE SENSOR (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 repair information because this may cause a malfunction.
Remove the No. 1 HV battery shield panel.
HINT:

Refer to PROCEDURE - Step 35
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

Enter the following menus: Powertrain / Hybrid Control / Active Test / Control the Hybrid Battery Cooling Fan.

Powertrain > Hybrid Control > Active Test

Active Test Display
Control the Hybrid Battery Cooling Fan

Data List Display
Hybrid Battery Cooling Fan
Hybrid Battery Cooling Fan 1 Frequency

Powertrain > Hybrid Control > Active Test

Tester Display	Measurement Item	Control Range	Restrict Condition
Control the Hybrid 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

Enter the following menus: Powertrain / Hybrid Control / Data List / Hybrid Battery Cooling Fan 1 Frequency.
Select each air volume mode 1 to 6 in the "Control the Hybrid Battery Cooling Fan" Active Test to operate the battery cooling blower assembly.
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 hybrid vehicle control ECU sends a command to operate the battery cooling blower assembly.

Specified Condition

(M35)

Tester Connection	Condition
M35-8 (FP0) - M35-5 (GND)	Battery cooling blower assembly is operating.

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 Voltage Sensor)

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
Difference between the value in the Data List (Hybrid Battery Cooling Fan 1 Frequency) and the actual measured value at the battery voltage sensor connector is 10% or less.	A
Other than above	B

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Install the No. 1 HV battery shield panel.

Result:

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to REMOVAL [11/2015 -]

Result:

REPLACE BATTERY VOLTAGE SENSOR. Refer to REMOVAL [11/2015 - 12/2018]

CHECK FUSE (BATT FAN)

Remove the BATT FAN fuse from the No. 1 engine room relay block and No. 1 junction block assembly.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
*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 to the No. 1 engine room relay block and No. 1 junction block assembly.

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 repair information because this may cause a malfunction.
Remove the rear seat cushion assembly.
HINT:

Refer to PROCEDURE - Step 7

Disconnect the M38 battery cooling bower 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.
Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
Clear the DTCs.
Powertrain > Hybrid Control > Clear DTCs

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

Standard Voltage

(M38)

Tester Connection	Condition	Specified Condition
M38-2 (IG0) - M38-3 (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.
Turning the power switch on (IG) 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)

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.

Install the rear seat cushion assembly.

Result

Proceed to
OK
NG

Result:

See step 13

Result:

See step 9

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - 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 repair information because this may cause a malfunction.
Disconnect the F2 hybrid vehicle control ECU connector.
NOTE:
- Before disconnecting the connector, check that it is not loose or disconnected.
- Check that each connector between the hybrid vehicle control ECU and battery cooling blower assembly is not loose or disconnected.
Remove the rear seat cushion assembly.
HINT:

Refer to PROCEDURE - Step 7

Disconnect the M38 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 Hybrid Vehicle Control ECU)
*b	Front view of wire harness connector (to Battery Cooling Blower Assembly)

Standard Resistance

(F2, M38)

(F2)

(M38)

Tester Connection	Condition	Specified Condition
F2-38 (SI0) - M38-4 (SI0)	Power switch off	Below 1 Ω
M38-4 (SI0) - Body ground and other terminals	Power switch off	10 kΩ or higher

NOTE:

Make sure that each connector between the hybrid vehicle control ECU 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

(M38)

Tester Connection	Condition	Specified Condition
M38-4 (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 hybrid vehicle control ECU connector and battery cooling blower assembly.

Turn the power switch off.
Disconnect the cable from the negative (-) auxiliary battery terminal.
Reconnect the M38 battery cooling blower assembly connector.
Install the rear seat cushion assembly.

Reconnect the F2 hybrid vehicle control ECU connector.

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 10

CHECK HYBRID VEHICLE CONTROL ECU

Remove the hybrid vehicle control ECU.
HINT:

Refer to REMOVAL [11/2015 - 12/2018]

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Component without harness connected
(Hybrid Vehicle Control ECU)

Standard Resistance

(F2)

Tester Connection	Condition	Specified Condition
F2-38 (SI0) - F2-12 (E01)	IG OFF	10 kΩ or higher

Install the hybrid vehicle control ECU.

Result

Proceed to
OK
NG

Result:

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to REMOVAL [11/2015 - 12/2018]

Result:

See step 11

CHECK HYBRID VEHICLE CONTROL ECU (SI0 VOLTAGE)

Turn the power switch on (IG).

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Component with harness connected
(Hybrid Vehicle Control ECU)

Standard Voltage

(F2)

Tester Connection	Condition	Specified Condition
F2-38 (SI0) - F2-12 (E01)	Power switch on (IG)	4.5 to 5.5 V

Turn the power switch off.

Result

Proceed to
OK
NG

Result:

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to REMOVAL [11/2015 -]

Result:

See step 12

CHECK BATTERY COOLING BLOWER ASSEMBLY

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.
Powertrain > Hybrid Control > Clear DTCs

Enter the following menus: Powertrain / Hybrid Control / Active Test / Control the Hybrid Battery Cooling Fan.

Powertrain > Hybrid Control > Active Test

Active Test Display
Control the Hybrid Battery Cooling Fan

Data List Display
Hybrid Battery Cooling Fan

Powertrain > Hybrid Control > Active Test

Tester Display	Measurement Item	Control Range	Restrict Condition
Control the Hybrid 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

Select each air volume mode 1 to 6 in the "Control the Hybrid Battery Cooling Fan" Active Test to operate the battery cooling blower assembly.
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 hybrid vehicle control ECU sends a command to operate the battery cooling blower assembly.

Connect an oscilloscope to the F2 hybrid vehicle control ECU connector and check the waveform.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Component with harness connected
(Hybrid Vehicle Control ECU)

Item	Content
Tester Connection	F2-38(SI0) - F2-12(E01)
Equipment Setting	10 V/DIV., 1 ms./DIV.
Condition	Power switch on (IG), during Active Test

HINT:

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

Turn the power switch off.

Disconnect the cable from the negative (-) auxiliary battery terminal.

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

Result:

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to REMOVAL [11/2015 -]

Result:

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to REMOVAL [11/2015 - 12/2018]

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 repair information because this may cause a malfunction.
Remove the rear seat cushion assembly.
HINT:

Refer to PROCEDURE - Step 7

Disconnect the M38 battery cooling bower 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

(M38)

Tester Connection	Condition	Specified Condition
M38-3 (GND0) - Body ground	Power switch off	Below 1 Ω

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

Connect the M38 battery cooling bower assembly connector.

Install the rear seat cushion assembly.

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 14

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BODY GROUND)

Disconnect the F2 hybrid vehicle control ECU 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

(F2)

Tester Connection	Condition	Specified Condition
F2-12 (E01) - Body ground	Power switch off	Below 1 Ω

*a	Front view of wire harness connector (to Hybrid Vehicle Control ECU)

Reconnect the F2 hybrid vehicle control ECU connector.

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 15

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BODY GROUND)

Disconnect the F2 hybrid vehicle control ECU 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

(F2)

Tester Connection	Condition	Specified Condition
F2-11 (E02) - Body ground	Power switch off	Below 1 Ω

*a	Front view of wire harness connector (to Hybrid Vehicle Control ECU)

Reconnect the F2 hybrid vehicle control ECU connector.

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 repair information because this may cause a malfunction.
Remove the IGCT relay from the No. 1 engine room relay block and No. 1 junction block assembly.
NOTE:
Check the terminals of the relay for deformation and corrosion.
Remove the rear seat cushion assembly.
HINT:

Refer to PROCEDURE - Step 7

Disconnect the M38 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

(M38)

Tester Connection	Condition	Specified Condition
IGCT relay terminal 5 - M38-2 (IG0)	Power switch off	Below 1 Ω

*1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
*a	Front view of wire harness connector (to Battery Cooling Blower Assembly)
*b	IGCT Relay Holder

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.

Reconnect the M38 battery cooling blower assembly connector.
Install the rear seat cushion assembly.

Install the IGCT relay to the No. 1 engine room relay block and No. 1 junction block assembly.

Result

Proceed to
OK
NG

Result:

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to REMOVAL [11/2015 - 12/2018]

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 repair information because this may cause a malfunction.
Remove the BATT FAN fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
Remove the rear seat cushion assembly.
HINT:

Refer to PROCEDURE - Step 7

Disconnect the M38 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

(M38)

Tester Connection	Condition	Specified Condition
M38-2 (IG0) - Terminals other than 2 (BATT FAN fuse) and body ground	Power switch off	10 kΩ or higher

*1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
*a	Front view of wire harness connector (to Battery Cooling Blower Assembly)
*b	BATT FAN Fuse Holder

NOTE:

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

Reconnect the M38 battery cooling blower assembly connector.
Install the rear seat cushion assembly.

Install the BATT FAN fuse to the No. 1 engine room relay block and No. 1 junction block assembly.

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 repair information because this may cause a malfunction.
Remove the rear seat cushion assembly.
HINT:

Refer to PROCEDURE - Step 7

Disconnect the M38 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

(M38)

Tester Connection	Condition	Specified Condition
M38-2 (IG0) - M38-3 (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 M38 battery cooling blower assembly connector.

Install the rear seat cushion assembly.

Result

Proceed to
OK
NG

Result:

REPLACE FUSE (BATT FAN)

Result:

See step 19

REPLACE BATTERY COOLING BLOWER ASSEMBLY
HINT:

Refer to REMOVAL [11/2015 -]

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)