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

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

(a) Disconnect the U12 connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
Resistance:

Voltage:

(d) Disconnect the U13 connector.
(e) Measure the voltage and resistance according to the value(s) in the table below.
Resistance:

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 the 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:

C -- REPLACE SEATBACK BLOWER
B -- REPLACE SEAT CUSHION BLOWER
A -- Continue to next step.
4. CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER)

(a) Disconnect the J59, U12 and U13 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.
5. CHECK WIRE HARNESS (SEAT HEATER SWITCH)

(a) Disconnect the J45 connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
Resistance:

Voltage:

NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.
6. INSPECT SEAT HEATER SWITCH

(a) Disconnect the J45 switch.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPLACE SEAT HEATER SWITCH
OK -- Continue to next step.
7. CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY)

(a) Disconnect the J45 and J59 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- REPLACE A/C AMPLIFIER ASSEMBLY
8. CHECK WIRE HARNESS

(a) Disconnect the T12 connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
Resistance:

Voltage:

(d) Disconnect the T13 connector.
(e) Measure the voltage and resistance according to the value(s) in the table below.
Resistance:

Voltage:

NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.
9. INSPECT SEAT CLIMATE CONTROL BLOWER

OK:
The waveform is displayed as shown in the illustration.
Result:

C -- REPLACE SEATBACK BLOWER
B -- REPLACE SEAT CUSHION BLOWER
A -- Continue to next step.
10. CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER)

(a) Disconnect the J59, T12 and T13 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.
11. CHECK WIRE HARNESS (SEAT HEATER SWITCH)

(a) Disconnect the J45 connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
Resistance:

Voltage:

NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.
12. INSPECT SEAT HEATER SWITCH

(a) Disconnect the J45 switch.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPLACE SEAT HEATER SWITCH
OK -- Continue to next step.
13. CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY)

(a) Disconnect the J45 and J59 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- REPLACE A/C AMPLIFIER ASSEMBLY
14. CHECK WIRE HARNESS

(a) Disconnect the U12 (T12) connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
*1: Front LH
*2: Front RH
Resistance:
Front LH

Front RH

Voltage:
Front LH

Front RH

(d) Disconnect the U13 (T13) connector.
(e) Measure the voltage and resistance according to the value(s) in the table below.
*1: Front LH
*2: Front RH
Resistance:
Front LH

Front RH

Voltage:
Front LH

Front RH

NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.
15. INSPECT SEAT CLIMATE CONTROL BLOWER

OK:
The waveform is displayed as shown in the illustration.
*1: Front LH
*2: Front RH
Result:

C -- REPLACE SEATBACK BLOWER
B -- REPLACE SEAT CUSHION BLOWER
A -- Continue to next step.
16. CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER)

(a) Disconnect the J59, U12 (T12) and U13 (T13) connectors.
*1: Front LH
*2: Front RH
(b) Measure the resistance according to the value(s) in the table below.
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 J45 connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
Resistance:

Voltage:

NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.
18. INSPECT SEAT HEATER SWITCH

(a) Disconnect the J45 switch.
(b) Measure the resistance according to the value(s) in the table below.
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) Disconnect the J45 and J59 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:
Front LH

Front RH

NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- REPLACE A/C AMPLIFIER ASSEMBLY