Toyota CH-R Service Manual: Seat Heater for Front Right Seat does not Operate

Toyota CH-R Service Manual / Seat / Seat Heater System / Seat Heater for Front Right Seat does not Operate

DESCRIPTION

When the seat heater switch on air conditioning control assembly is operated, the seat heater control sub-assembly RH receives the signal. The seat heater control sub-assembly RH receives the signal and operates the front seat heater.

WIRING DIAGRAM

for TMC Made

for TMMT Made

CAUTION / NOTICE / HINT

NOTICE:

If the battery voltage is low, the seat heater system may not operate. Refer to Data List for the power steering system.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Air Conditioner > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

OK:

DTC B14B5 is not output.

Result	Proceed to
OK (for TMC Made)	A
OK (for TMMT Made)	B
NG	C

GO TO STEP 12

GO TO DIAGNOSTIC TROUBLE CODE CHART

3.	CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT HEATER CONTROL SUB-ASSEMBLY RH)

(a) Disconnect the seat heater control sub-assembly RH connector.

*a	Front view of wire harness connector (to Seat Heater Control Sub-assembly RH)

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
Y4-1 (+B1) - Body ground	Ignition switch ON	11 to 14 V
Y4-1 (+B1) - Body ground	Ignition switch off	Below 1 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (SEAT HEATER CONTROL SUB-ASSEMBLY RH - FRONT SEAT CUSHION HEATER ASSEMBLY RH - BODY GROUND)

(a) Disconnect the Y4 seat heater control sub-assembly RH connector.

(b) Disconnect the Y2 front seat cushion heater assembly RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Y4-7 (HTR1) - Y2-1	Always	Below 1 Ω
Y4-9 (THR+) - Y2-4	Always	Below 1 Ω
Y4-5 (THR-) - Y2-5	Always	Below 1 Ω
Y4-10 (E) - Y2-6	Always	Below 1 Ω
Y2-2 - Body ground	Always	Below 1 Ω
Y4-7 (HTR1) or Y2-1 - Body ground	Always	10 kΩ or higher
Y4-9 (THR+) or Y2-4 - Body ground	Always	10 kΩ or higher
Y4-5 (THR-) or Y2-5 - Body ground	Always	10 kΩ or higher
Y4-10 (E) or Y2-6 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY RH

(a) Remove the front seat cushion heater assembly RH.

Click here

(b) Inspect the front seat cushion heater assembly RH.

Click here

REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY RH

6.	INSPECT FRONT SEATBACK HEATER ASSEMBLY RH

(a) Remove the front seatback heater assembly RH.

Click here

(b) Inspect the front seatback heater assembly RH.

Click here

REPLACE FRONT SEATBACK HEATER ASSEMBLY RH

7.	CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) - SEAT HEATER CONTROL SUB-ASSEMBLY RH)

(a) Disconnect the F61 seat heater switch (air conditioning control assembly) connector.

(b) Disconnect the Y4 seat heater control sub-assembly RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F61-11 (SW) - Y4-2 (SWR)	Always	Below 1 Ω
F61-4 (RV) - Y4-3 (VOL)	Always	Below 1 Ω
F61-11 (SW) or Y4-2 (SWR) - Body ground	Always	10 kΩ or higher
F61-4 (RV) or Y4-3 (VOL) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY RH

(a) Temporarily replace the heater control sub-assembly RH with a new or known good one.

Click here

9.	CHECK SEAT HEATER SYSTEM OPERATION

(a) Check that the seat heater system is operated normally.

OK:

The seat heater system is operated normally.

END (SEAT HEATER CONTROL SUB-ASSEMBLY WAS DEFECTIVE)

10.	REPLACE SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY)

(a) Temporarily replace the seat heater switch (air conditioning control assembly) with a new or known good one.

Click here

11.	CHECK SEAT HEATER SYSTEM OPERATION

(a) Check that the seat heater system is operated normally.

OK:

The seat heater system is operated normally.

END (SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) WAS DEFECTIVE)

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

12.	CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT HEATER CONTROL SUB-ASSEMBLY RH)

(a) Disconnect the seat heater control sub-assembly RH connector.

*a	Front view of wire harness connector (to Seat Heater Control Sub-assembly RH)

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
Y4-8 (+B1) - Body ground	Ignition switch ON	11 to 14 V
Y4-8 (+B1) - Body ground	Ignition switch off	Below 1 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.	CHECK HARNESS AND CONNECTOR (SEAT HEATER CONTROL SUB-ASSEMBLY RH - FRONT SEAT CUSHION HEATER ASSEMBLY RH - BODY GROUND)

(a) Disconnect the Y4 seat heater control sub-assembly RH connector.

(b) Disconnect the Y2 front seat cushion heater assembly RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Y4-1 (HTR1) - Y2-1	Always	Below 1 Ω
Y4-6 (THR+) - Y2-4	Always	Below 1 Ω
Y4-11 (THR-) - Y2-5	Always	Below 1 Ω
Y4-7 (E) - Y2-6	Always	Below 1 Ω
Y2-2 - Body ground	Always	Below 1 Ω
Y4-1 (HTR1) or Y2-1 - Body ground	Always	10 kΩ or higher
Y4-6 (THR+) or Y2-4 - Body ground	Always	10 kΩ or higher
Y4-11 (THR-) or Y2-5 - Body ground	Always	10 kΩ or higher
Y4-7 (E) or Y2-6 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.	INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY RH

(a) Remove the front seat cushion heater assembly RH.

Click here

(b) Inspect the front seat cushion heater assembly RH.

Click here

REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY RH

15.	INSPECT FRONT SEATBACK HEATER ASSEMBLY RH

(a) Remove the front seatback heater assembly RH.

Click here

(b) Inspect the front seatback heater assembly RH.

Click here

REPLACE FRONT SEATBACK HEATER ASSEMBLY RH

16.	CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) - SEAT HEATER CONTROL SUB-ASSEMBLY RH)

(a) Disconnect the F61 seat heater switch (air conditioning control assembly) connector.

(b) Disconnect the Y4 seat heater control sub-assembly RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F61-11 (SW) - Y4-3 (SWR)	Always	Below 1 Ω
F61-4 (RV) - Y4-4 (VOL)	Always	Below 1 Ω
F61-11 (SW) or Y4-3 (SWR) - Body ground	Always	10 kΩ or higher
F61-4 (RV) or Y4-4 (VOL) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

17.	REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY RH

(a) Temporarily replace the heater control sub-assembly RH with a new or known good one.

Click here

18.	CHECK SEAT HEATER SYSTEM OPERATION

(a) Check that the seat heater system is operated normally.

OK:

The seat heater system is operated normally.

END (SEAT HEATER CONTROL SUB-ASSEMBLY WAS DEFECTIVE)

19.	REPLACE SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY)

(a) Temporarily replace the seat heater switch (air conditioning control assembly) with a new or known good one.

Click here

20.	CHECK SEAT HEATER SYSTEM OPERATION

(a) Check that the seat heater system is operated normally.

OK:

The seat heater system is operated normally.

END (SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) WAS DEFECTIVE)

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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