Climate Control Seat System Does Not Operate
SEAT: CLIMATE CONTROL SEAT SYSTEM: Climate Control Seat System does not Operate
- Climate Control Seat System does not Operate
DESCRIPTION
The A/C amplifier assembly receives seat heater switch position signals when the power switch is on (IG), and then transmits airflow amount signals to each seat climate blower.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1. SYSTEM CHECK
(a) Check the climate control seat operation.
Result:
C -- INSPECT SEAT HEATER SWITCH
B -- SYSTEM CHECK
A -- Continue to next step.
2. SYSTEM CHECK
(a) Check the climate control operation again.
Result:
B -- CHECK HARNESS AND CONNECTOR (SEAT CUSHION BLOWER POWER SUPPLY)
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (SEAT BACK BLOWER POWER SUPPLY)
(a) Disconnect the T13 connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- CHECK HARNESS AND CONNECTOR (SEAT CUSHION BLOWER - SEAT BACK BLOWER)
OK -- REPLACE SEAT BACK CLIMATE CONTROL BLOWER LH Disassembly
4. CHECK HARNESS AND CONNECTOR (SEAT CUSHION BLOWER - SEAT BACK BLOWER)
(a) Disconnect the T12 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH Disassembly
5. CHECK HARNESS AND CONNECTOR (SEAT CUSHION BLOWER POWER SUPPLY)
(a) Disconnect the T12 connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage and Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
(a) Reconnect the T12 connector.
(b) Check the input signal waveform.
(1) Connect an oscilloscope to terminal 3 and body ground with the seat cushion climate control blower assembly LH connector still connected.
(2) Check the signal waveform according to the condition(s) in the table below.
Text in Illustration
NG -- CHECK HARNESS AND CONNECTOR (SEAT CUSHION BLOWER - A/C AMPLIFIER)
OK -- REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY LH Disassembly
7. CHECK HARNESS AND CONNECTOR (SEAT CUSHION BLOWER - A/C AMPLIFIER)
(a) Disconnect the T12 and F48 connectors.
(b) 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.
8. INSPECT SEAT HEATER SWITCH
(a) Remove the seat heater switch Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE SEAT HEATER SWITCH Removal
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH - A/C AMPLIFIER)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
10. SYSTEM CHECK
(a) Check the climate control operation again.
Result:
B -- CHECK HARNESS AND CONNECTOR (SEAT CUSHION BLOWER POWER SUPPLY)
A -- Continue to next step.
11. CHECK HARNESS AND CONNECTOR (SEAT BACK BLOWER POWER SUPPLY)
(a) Disconnect the S8 connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- CHECK HARNESS AND CONNECTOR (SEAT BACK BLOWER - SEAT CUSHION BLOWER)
OK -- REPLACE SEAT BACK CLIMATE CONTROL BLOWER RH Disassembly
12. CHECK HARNESS AND CONNECTOR (SEAT BACK BLOWER - SEAT CUSHION BLOWER)
(a) Disconnect the S7 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH Disassembly
13. CHECK HARNESS AND CONNECTOR (SEAT CUSHION BLOWER POWER SUPPLY)
(a) Disconnect the S7 connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage and Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
14. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
(a) Reconnect the S7 connector.
(b) Check the input signal waveform.
(1) Connect an oscilloscope to terminal 3 and body ground with the climate control blower assembly RH connector still connected.
(2) Check the signal waveform according to the condition(s) in the table below.
Text in Illustration
NG -- CHECK HARNESS AND CONNECTOR (SEAT CUSHION BLOWER - A/C AMPLIFIER)
OK -- REPLACE SEAT CUSHION CLIMATE CONTROL BLOWER ASSEMBLY RH Disassembly
15. CHECK HARNESS AND CONNECTOR (SEAT CUSHION BLOWER - A/C AMPLIFIER)
(a) Disconnect the S7 and F48 connectors.
(b) 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.
16. INSPECT SEAT HEATER SWITCH
(a) Remove the seat heater switch Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE SEAT HEATER SWITCH Removal
OK -- Continue to next step.
17. CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH - A/C AMPLIFIER)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
18. INSPECT SEAT HEATER SWITCH
(a) Remove the seat heater switch Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE SEAT HEATER SWITCH Removal
OK -- Continue to next step.
19. CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH - A/C AMPLIFIER)
(a) Disconnect the F48 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal