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 position signals when the engine switch is on (IG), and then transmits airflow amount signals to each seat climate blower.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. SYSTEM CHECK

(a) Check if the climate control seat system operates normally.

Result:





B -- CHECK WIRE HARNESS

C -- CHECK WIRE HARNESS
A -- Continue to next step.

2. CHECK WIRE HARNESS

(a) Disconnect the U15 connector.





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

Standard resistance:





Standard voltage:





(c) Reconnect the U15 connector.

(d) Disconnect the U14 connector.





(e) Measure the voltage and resistance according to the value(s) in the table below.

Standard resistance:





Standard voltage:





NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.

3. INSPECT SEAT CLIMATE CONTROL BLOWER

(a) Check the input signal waveform.





(1) Connect an oscilloscope to terminal U15-3 (SIGN) and body ground with the climate control blower connector still connected.

(2) Check the signal waveform according to the condition(s) in the table below.





OK:

The waveform is displayed as shown in the illustration.

Result:





B -- REPLACE SEAT CUSHION BLOWER

C -- REPLACE SEATBACK BLOWER
A -- Continue to next step.

4. CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER)

(a) Disconnect the E2 and U15 connectors.





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

Standard resistance:





NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.

5. CHECK WIRE HARNESS (SEAT HEATER SWITCH)

(a) Disconnect the F3 connector.





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

Standard resistance:





Standard voltage:





NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.

6. INSPECT SEAT HEATER SWITCH

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





Standard resistance:





NG -- REPLACE SEAT HEATER SWITCH
OK -- Continue to next step.

7. CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY)

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





Standard resistance:





NG -- REPAIR OR REPLACE WIRE HARNESS

OK -- REPLACE A/C AMPLIFIER ASSEMBLY

8. CHECK WIRE HARNESS

(a) Disconnect the T17 connector.





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

Standard resistance:





Standard voltage:





(c) Reconnect the T17 connector.

(d) Disconnect the T16 connector.





(e) Measure the voltage and resistance according to the value(s) in the table below.

Standard resistance:





Standard voltage:





NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.

9. INSPECT SEAT CLIMATE CONTROL BLOWER

(a) Check the input signal waveform.





(1) Connect an oscilloscope to terminal T17-3 (SIGN) and body ground with the climate control blower connector still connected.

(2) Check the signal waveform according to the condition(s) in the table below.





OK:

The waveform is displayed as shown in the illustration.

Result:





B -- REPLACE SEAT CUSHION BLOWER

C -- REPLACE SEATBACK BLOWER
A -- Continue to next step.

10. CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER)

(a) Disconnect the E2 and T17 connectors.





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

Standard resistance:





NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.

11. CHECK WIRE HARNESS (SEAT HEATER SWITCH)

(a) Disconnect the F3 connector.





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

Standard resistance:





Standard voltage:





NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.

12. INSPECT SEAT HEATER SWITCH

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





Standard resistance:





NG -- REPLACE SEAT HEATER SWITCH
OK -- Continue to next step.

13. CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY)

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





Standard resistance:





NG -- REPAIR OR REPLACE WIRE HARNESS

OK -- REPLACE A/C AMPLIFIER ASSEMBLY

14. CHECK WIRE HARNESS

(a) Disconnect the U15 and T17 connectors.





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

Standard resistance:

Front LH
Front RH










Standard voltage:

Front LH
Front RH










(c) Reconnect the U15 and T17 connectors.

(d) Disconnect the U14 and T16 connectors.





(e) Measure the voltage and resistance according to the value(s) in the table below.

Standard resistance:

Front LH
Front RH










Standard voltage:

Front LH
Front RH










NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.

15. INSPECT SEAT CLIMATE CONTROL BLOWER

(a) Check the input signal waveform.





(1) Connect an oscilloscope to terminal 3 and body ground with the climate control blower connector still connected.

(2) Check the signal waveform according to the condition(s) in the table below.





OK:

The waveform is displayed as shown in the illustration.

Result:





B -- REPLACE SEAT CUSHION BLOWER

C -- REPLACE SEATBACK BLOWER
A -- Continue to next step.

16. CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER)

(a) Disconnect the E2, U15 and T17 connectors.





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

Standard resistance:

Front LH
Front RH










NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.

17. CHECK WIRE HARNESS (SEAT HEATER SWITCH)

(a) Disconnect the F3 connector.





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

Standard resistance:





Standard voltage:





NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.

18. INSPECT SEAT HEATER SWITCH

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





Standard resistance:

Front LH
Front RH










NG -- REPLACE SEAT HEATER SWITCH
OK -- Continue to next step.

19. CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY)

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





Standard resistance:

Front LH
Front RH










NG -- REPAIR OR REPLACE WIRE HARNESS

OK -- REPLACE A/C AMPLIFIER ASSEMBLY