Toyota CH-R Service Manual: 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
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- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. |
CLEAR DTC |
(a) Clear the DTCs.
Click here
|
.gif)
|
2. |
CHECK FOR DTC |
(a) Check for DTCs.
Click here
OK:
DTC B14B5 is not output.
|
Result |
Proceed to |
|---|---|
|
OK (for TMC Made) |
A |
|
OK (for TMMT Made) |
B |
|
NG |
C |
| B | .gif) |
GO TO STEP 12 |
| C | |
GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
|
3. |
CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT HEATER CONTROL SUB-ASSEMBLY LH) |
|
(a) Disconnect the seat heater control sub-assembly LH connector. |
|
(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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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
|
|
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) |
|
|
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.
| 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. |
|
(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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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
|
|
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) |
|
|
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.
| OK | |
END (SEAT HEATER SWITCH (AIR CONDITIONING CONTROL ASSEMBLY) WAS DEFECTIVE) |
| NG | |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
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DESCRIPTION
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Toyota C-HR (AX20) 2023-2026 Owner's Manual
Toyota CH-R Owners Manual
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