Climate Control System Does Not Operate on Rear Left Side
SEAT: CLIMATE CONTROL SEAT SYSTEM: Climate Control System does not Operate on Rear Left Side
- Climate Control System does not Operate on Rear Left Side
DESCRIPTION
When the curtain switch assembly's* seat heater switch is operated, the rear power seat switch receives the signal. The rear power seat switch then sends the signal to the seat climate control ECU through LIN communication. The seat climate control ECU receives the signal and operates the air seat.
HINT
*: except 4-Passenger with Ottoman
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no LIN communication malfunctions before troubleshooting this problem.
PROCEDURE
1. CONFIRM PROBLEM SYMPTOMS
Result
B -- CONFIRM TROUBLE AREAS
C -- READ VALUE USING TECHSTREAM (REAR POWER SEAT MODULE SWITCH)
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (REAR POWER SEAT MODULE SWITCH)
(a) Check the Data List for proper functioning of the rear power seat module switch.
Rear Console Switch
OK:
Tester display changes normally when rear left seat A/C switch is operated
Result
B -- REPLACE REAR POWER SEAT MODULE SWITCH Removal
C -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
D -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
A -- Continue to next step.
3. INSPECT CURTAIN SWITCH ASSEMBLY
(a) Measure the voltage according to the value(s) in the table below.
Standard voltage:
HINT
As the circuit has a diode, perform the measurement with the tester in diode mode.
(b) Disconnect the r3 curtain switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Result
B -- REPLACE CURTAIN SWITCH ASSEMBLY Disassembly
C -- REPLACE CURTAIN SWITCH ASSEMBLY Disassembly
A -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT MODULE SWITCH - CURTAIN SWITCH)
(a) Disconnect the r1 power seat switch connector.
(b) Disconnect the r3 curtain switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Result
B -- REPLACE REAR POWER SEAT MODULE SWITCH Disassembly
C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- REPLACE REAR POWER SEAT MODULE SWITCH Disassembly
5. CONFIRM TROUBLE AREAS
Result
B -- PERFORM ACTIVE TEST USING TECHSTREAM
C -- PERFORM ACTIVE TEST USING TECHSTREAM
A -- Continue to next step.
6. READ VALUE USING TECHSTREAM (REAR POWER SEAT MODULE SWITCH)
(a) Check the Data List for proper functioning of the rear power seat module switch.
Rear Console Switch
OK:
Tester display changes normally when rear left seat A/C switch is operated
Result
B -- REPLACE REAR POWER SEAT MODULE SWITCH Removal
C -- PERFORM ACTIVE TEST USING TECHSTREAM
A -- Continue to next step.
7. INSPECT CURTAIN SWITCH ASSEMBLY
(a) Disconnect the r3 curtain switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Result
B -- REPLACE CURTAIN SWITCH ASSEMBLY Disassembly
C -- REPLACE CURTAIN SWITCH ASSEMBLY Disassembly
A -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT MODULE SWITCH - CURTAIN SWITCH)
(a) Disconnect the r1 power seat switch connector.
(b) Disconnect the r3 curtain switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Result
B -- REPLACE REAR POWER SEAT MODULE SWITCH Disassembly
C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- REPLACE REAR POWER SEAT MODULE SWITCH Disassembly
9. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Select the Active Test, use the Techstream to generate a control command, and then check the climate control seat function.
Rear Left Seat A/C
OK:
Cool air operates normally
Result
B -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
C -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
A -- Continue to next step.
10. CHECK SEAT CLIMATE CONTROL CONTROLLER LH
(a) w/o Ottoman:
Replace the seat climate control controller LH Disassembly.
(b) w/ Ottoman:
Replace the seat climate control controller LH Disassembly.
(c) Check the climate control seat function is normal.
OK:
Climate control seat function is normal
NG -- CHECK REAR SEATBACK CLIMATE CONTROL BLOWER LH
OK -- END (SEAT CLIMATE CONTROL CONTROLLER LH WAS DEFECTIVE)
11. CHECK REAR SEATBACK CLIMATE CONTROL BLOWER LH
(a) w/o Ottoman:
Replace the rear seatback climate control blower LH Disassembly.
(b) w/ Ottoman:
Replace the rear seatback climate control blower LH Disassembly.
(c) Check the climate control seat function is normal.
OK:
Climate control seat function is normal
NG -- CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL CONTROLLER LH AND REAR SEATBACK CLIMATE CONTROL BLOWER LH)
OK -- END (REAR SEATBACK CLIMATE CONTROL BLOWER LH WAS DEFECTIVE)
12. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL CONTROLLER LH AND REAR SEATBACK CLIMATE CONTROL BLOWER LH)
(a) Disconnect the f28 ECU connector.
(b) Disconnect the p3 climate control controller connector.
(c) Disconnect the f32 climate control blower connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Result
B -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
13. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Select the Active Test, use the Techstream to generate a control command, and then check the blower motor function.
Rear Left Seat A/C
OK:
Blower motor operates normally
Result
B -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
C -- CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL BLOWER LH)
A -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
14. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - SEAT CLIMATE CONTROL BLOWER LH)
(a) Disconnect the f28 ECU connector.
(b) Disconnect the p4 climate control blower connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
15. CHECK SEAT CLIMATE CONTROL ECU
(a) Disconnect the p4 climate control blower connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
Result
B -- REPLACE SEAT CLIMATE CONTROL BLOWER LH Disassembly
C -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
D -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
A -- REPLACE SEAT CLIMATE CONTROL BLOWER LH Disassembly
16. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Select the Active Test, use the Techstream to generate a control command, and then check the blower motor function.
Rear Left Seat A/C
OK:
Blower motor operates normally
Result
B -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
C -- CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK CLIMATE CONTROL BLOWER LH)
A -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
17. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK CLIMATE CONTROL BLOWER LH)
(a) Disconnect the f28 ECU connector.
(b) Disconnect the f31 climate control blower connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
18. CHECK SEAT CLIMATE CONTROL ECU
(a) Disconnect the f31 climate control blower connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
Result
B -- REPLACE SEAT CLIMATE CONTROL BLOWER LH Disassembly
C -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
D -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
A -- REPLACE SEAT CLIMATE CONTROL BLOWER LH Disassembly
19. READ VALUE USING TECHSTREAM (REAR POWER SEAT MODULE SWITCH)
(a) Check the Data List for proper functioning of the rear power seat module switch.
Rear Console Switch
OK:
Tester display changes normally when rear left seat A/C switch is operated
Result
B -- INSPECT CURTAIN SWITCH ASSEMBLY
C -- REPLACE REAR POWER SEAT MODULE SWITCH Removal
A -- Continue to next step.
20. INSPECT REAR SEATBACK COVER LH
(a) Remove the rear seatback cover LH.
(b) Check the seatback heater.
(1) Measure the resistance according to the value(s) in the table below.
Standard resistance:
If the result is not as specified, replace the rear seatback cover LH.
(c) Check the rear wing heater.
(1) Measure the resistance according to the value(s) in the table below.
Standard resistance:
If the result is not as specified, replace the rear seatback cover LH.
Result
B -- REPLACE REAR SEATBACK COVER LH Removal
C -- REPLACE REAR SEATBACK COVER LH Removal
A -- Continue to next step.
21. INSPECT REAR SEAT CUSHION COVER LH
(a) Remove the rear seat cushion cover LH.
(b) Check the rear seat cushion heater.
(1) Measure the resistance according to the value(s) in the table below.
Standard resistance:
If the result is not as specified, replace the rear seat cushion cover LH.
(c) Check the rear wing heater.
(1) Measure the resistance according to the value(s) in the table below.
Standard resistance:
If the result is not as specified, replace the rear seat cushion cover LH.
Result
B -- REPLACE REAR SEAT CUSHION COVER LH Removal
C -- REPLACE REAR SEAT CUSHION COVER LH Removal
A -- Continue to next step.
22. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK COVER LH)
(a) Disconnect the f27 ECU connector.
(b) Disconnect the f23 seatback cover connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Result
B -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- REPLACE SEAT CLIMATE CONTROL ECU Disassembly
23. INSPECT CURTAIN SWITCH ASSEMBLY
(a) Disconnect the r3 curtain switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Result
B -- REPLACE CURTAIN SWITCH ASSEMBLY Disassembly
C -- REPLACE CURTAIN SWITCH ASSEMBLY Disassembly
A -- Continue to next step.
24. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT MODULE SWITCH - CURTAIN SWITCH)
(a) Disconnect the r1 rear power seat switch connector.
(b) Disconnect the r3 curtain switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Result
B -- REPLACE REAR POWER SEAT MODULE SWITCH Disassembly
C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- REPLACE REAR POWER SEAT MODULE SWITCH Disassembly