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

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

DESCRIPTION

When the seat heater switch on air conditioning control assembly is operated, the seat heater control sub-assembly LH receives the signal. The seat heater control sub-assembly LH 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

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Air Conditioner > Clear DTCs
NEXT

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

B

GO TO STEP 12

C

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

3.

CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT HEATER CONTROL SUB-ASSEMBLY LH)

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

*a

Front view of wire harness connector

(to Seat Heater Control Sub-assembly LH)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Z2-1 (+B1) - Body ground

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

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

(a) Disconnect the Z2 seat heater control sub-assembly LH connector.

(b) Disconnect the Z1 front seat cushion heater assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z2-7 (HTR1) - Z1-1

Always

Below 1 Ω

Z2-9 (THR+) - Z1-4

Always

Below 1 Ω

Z2-5 (THR-) - Z1-5

Always

Below 1 Ω

Z2-10 (E) - Z1-6

Always

Below 1 Ω

Z1-2 - Body ground

Always

Below 1 Ω

Z2-7 (HTR1) or Z1-1 - Body ground

Always

10 kΩ or higher

Z2-9 (THR+) or Z1-4 - Body ground

Always

10 kΩ or higher

Z2-5 (THR-) or Z1-5 - Body ground

Always

10 kΩ or higher

Z2-10 (E) or Z1-6 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY LH

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

Click here

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

Click here

NG

REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH

OK

6.

INSPECT FRONT SEATBACK HEATER ASSEMBLY LH

(a) Remove the front seatback heater assembly LH.

Click here

(b) Inspect the front seatback heater assembly LH.

Click here

NG

REPLACE FRONT SEATBACK HEATER ASSEMBLY LH

OK

7.

CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) - SEAT HEATER CONTROL SUB-ASSEMBLY LH)

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

(b) Disconnect the Z2 seat heater control sub-assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F61-12 (SW) - Z2-2 (SWR)

Always

Below 1 Ω

F61-6 (RV) - Z2-3 (VOL)

Always

Below 1 Ω

F61-12 (SW) or Z2-2 (SWR) - Body ground

Always

10 kΩ or higher

F61-6 (RV) or Z2-3 (VOL) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY LH

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

Click here

NEXT

9.

CHECK SEAT HEATER SYSTEM OPERATION

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

OK:

The seat heater system is operated normally.

OK

END (SEAT HEATER CONTROL SUB-ASSEMBLY LH WAS DEFECTIVE)

NG

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

NEXT

11.

CHECK SEAT HEATER SYSTEM OPERATION

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

OK:

The seat heater system is operated normally.

OK

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

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

12.

CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT HEATER CONTROL SUB-ASSEMBLY LH)

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

*a

Front view of wire harness connector

(to Seat Heater Control Sub-assembly LH)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Z2-8 (+B1) - Body ground

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

13.

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

(a) Disconnect the Z2 seat heater control sub-assembly LH connector.

(b) Disconnect the Z1 front seat cushion heater assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z2-1 (HTR1) - Z1-1

Always

Below 1 Ω

Z2-6 (THR+) - Z1-4

Always

Below 1 Ω

Z2-11 (THR-) - Z1-5

Always

Below 1 Ω

Z2-7 (E) - Z1-6

Always

Below 1 Ω

Z1-2 - Body ground

Always

Below 1 Ω

Z2-1 (HTR1) or Z1-1 - Body ground

Always

10 kΩ or higher

Z2-6 (THR+) or Z1-4 - Body ground

Always

10 kΩ or higher

Z2-11 (THR-) or Z1-5 - Body ground

Always

10 kΩ or higher

Z2-7 (E) or Z1-6 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

14.

INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY LH

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

Click here

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

Click here

NG

REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH

OK

15.

INSPECT FRONT SEATBACK HEATER ASSEMBLY LH

(a) Remove the front seatback heater assembly LH.

Click here

(b) Inspect the front seatback heater assembly LH.

Click here

NG

REPLACE FRONT SEATBACK HEATER ASSEMBLY LH

OK

16.

CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) - SEAT HEATER CONTROL SUB-ASSEMBLY LH)

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

(b) Disconnect the Z2 seat heater control sub-assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F61-12 (SW) - Z2-3 (SWR)

Always

Below 1 Ω

F61-6 (RV) - Z2-4 (VOL)

Always

Below 1 Ω

F61-12 (SW) or Z2-3 (SWR) - Body ground

Always

10 kΩ or higher

F61-6 (RV) or Z2-4 (VOL) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

17.

REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY LH

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

Click here

NEXT

18.

CHECK SEAT HEATER SYSTEM OPERATION

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

OK:

The seat heater system is operated normally.

OK

END (SEAT HEATER CONTROL SUB-ASSEMBLY LH WAS DEFECTIVE)

NG

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

NEXT

20.

CHECK SEAT HEATER SYSTEM OPERATION

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

OK:

The seat heater system is operated normally.

OK

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

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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