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

1. SYSTEM CHECK

Climate control seat does not operate (Front LH)	A
Climate control seat does not operate (Front RH)	B
Both climate control seats do not operate	C

B	Go to step 8
C	Go to step 14

A

2. CHECK WIRE HARNESS

1. Disconnect the U12 connector.

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

   Resistance:

   Tester Connection	Condition	Specified Condition
   U12-4 (GND) - Body ground	Always	Below 1 Ω

   Voltage:

   Tester Connection	Condition	Specified Condition
   U12-1 (IG) - Body ground	Engine switch on (IG)	10 to 14 V

3. Reconnect the U12 connector.

4. Disconnect the U13 connector.

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

   Resistance:

   Tester Connection	Condition	Specified Condition
   U13-1 (GND) - Body ground	Always	Below 1 Ω

   Voltage:

   Tester Connection	Condition	Specified Condition
   U13-2 (IG) - Body ground	Engine switch on (IG)	10 to 14 V

NG	REPAIR OR REPLACE WIRE HARNESS

OK

3. INSPECT SEAT CLIMATE CONTROL BLOWER

1. 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.

      Item	Condition
      Tool setting	2 V/DIV., 500 μsec/DIV.,
      Vehicle condition	Engine switch on (IG), seat heater switch ON

      OK:

      The waveform is displayed as shown in the illustration.
      

Result:

NG	A
OK (Seat cushion blower side)	B
OK (Seatback blower side)	C

B	REPLACE SEAT CUSHION BLOWER
C	REPLACE SEATBACK BLOWER

A

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

1. Disconnect the J59, U12 and U13 connectors.

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

   Resistance:

   LHD models:

   Tester Connection	Condition	Specified Condition
   J59-16 (LOUT) - U12-3 (SIGN)	Always	Below 1 Ω
   J59-16 (LOUT) - U13-3 (FCTB)	Always	Below 1 Ω
   J59-16 (LOUT) - Body ground	Always	10 kΩ or higher

   RHD models:

   Tester Connection	Condition	Specified Condition
   J59-8 (LOUT) - U12-3 (SIGN)	Always	Below 1 Ω
   J59-8 (LOUT) - U13-3 (FCTB)	Always	Below 1 Ω
   J59-8 (LOUT) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE WIRE HARNESS

OK

5. CHECK WIRE HARNESS (SEAT HEATER SWITCH)

1. Disconnect the J45 connector.

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

   Resistance:

   Tester Connection	Condition	Specified Condition
   J45-12 (E) - Body ground	Always	Below 1 Ω

   Voltage:

   Tester Connection	Condition	Specified Condition
   J45-5 (IG) - Body ground	Engine switch on (IG)	10 to 14 V

NG	REPAIR OR REPLACE WIRE HARNESS

OK

6. INSPECT SEAT HEATER SWITCH

1. Disconnect the J45 switch.

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

   Resistance:

   Tester Connection	Condition	Specified Condition
   J45-8 (ASS5) - J45-10 (SGND)	Always	Below 1 kΩ
   J45-9 (LH) - J45-10 (SGND)	Blower switch OFF	Below 1.1 kΩ
   	Blower switch ON (Vol: 3)	Below 111 Ω

NG	REPLACE SEAT HEATER SWITCH

OK

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

1. Disconnect the J45 and J59 connectors.

2. Measure the resistance according to the value(s) in the table below.(*): RHD models

   Resistance:

   Tester Connection	Condition	Specified Condition
   J45-8 (ASS5) - J59-7 (S5-4)	Always	Below 1 Ω
   LHD models: J45-9 (LH) - J59-3 (SW-4)	Always	Below 1 Ω
   RHD models: J45-9 (LH) - J59-2 (SW-4)	Always	Below 1 Ω
   J45-10 (SGND) - J59-10 (SG-4)	Always	Below 1 Ω
   J45-12 (E) - Body ground	Always	Below 1 Ω
   J45-8 (ASS5) - Body ground	Always	10 kΩ or higher
   J45-9 (LH) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE WIRE HARNESS

OK
REPLACE A/C AMPLIFIER ASSEMBLY

8. CHECK WIRE HARNESS

1. Disconnect the T12 connector.

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

   Resistance:

   Tester Connection	Condition	Specified Condition
   T12-4 (GND) - Body ground	Always	Below 1 Ω

   Voltage:

   Tester Connection	Condition	Specified Condition
   T12-1 (IG) - Body ground	Engine switch on (IG)	10 to 14 V

3. Reconnect the T12 connector.

4. Disconnect the T13 connector.

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

   Resistance:

   Tester Connection	Condition	Specified Condition
   T13-1 (GND) - Body ground	Always	Below 1 Ω

   Voltage:

   Tester Connection	Condition	Specified Condition
   T13-2 (IG) - Body ground	Engine switch on (IG)	10 to 14 V

NG	REPAIR OR REPLACE WIRE HARNESS

OK

9. INSPECT SEAT CLIMATE CONTROL BLOWER

1. 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.

      Item	Condition
      Tool setting	2 V/DIV., 500 μsec/DIV.,
      Vehicle condition	Engine switch on (IG), seat heater switch ON

      OK:

      The waveform is displayed as shown in the illustration.
      

Result:

NG	A
OK (Seat cushion blower side)	B
OK (Seatback blower side)	C

B	REPLACE SEAT CUSHION BLOWER
C	REPLACE SEATBACK BLOWER

A

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

1. Disconnect the J59, T12 and T13 connectors.

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

   Resistance:

   LHD models:

   Tester Connection	Condition	Specified Condition
   J59-8 (ROUT) - T12-3 (SIGN)	Always	Below 1 Ω
   J59-8 (ROUT) - T13-3 (VSVG)	Always	Below 1 Ω
   J59-8 (ROUT) - Body ground	Always	10 kΩ or higher

   RHD models:

   Tester Connection	Condition	Specified Condition
   J59-16 (ROUT) - T12-3 (SIGN)	Always	Below 1 Ω
   J59-16 (ROUT) - T13-3 (VSVG)	Always	Below 1 Ω
   J59-16 (ROUT) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE WIRE HARNESS

OK

11. CHECK WIRE HARNESS (SEAT HEATER SWITCH)

1. Disconnect the J45 connector.

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

   Resistance:

   Tester Connection	Condition	Specified Condition
   J45-12 (E) - Body ground	Always	Below 1 Ω

   Voltage:

   Tester Connection	Condition	Specified Condition
   J45-5 (IG) - Body ground	Engine switch on (IG)	10 to 14 V

NG	REPAIR OR REPLACE WIRE HARNESS

OK

12. INSPECT SEAT HEATER SWITCH

1. Disconnect the J45 switch.

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

   Resistance:

   Tester Connection	Condition	Specified Condition
   J45-8 (ASS5) - J45-10 (SGND)	Always	Below 1 kΩ
   J45-7 (RH) - J45-10 (SGND)	Blower switch OFF	Below 1.1 kΩ
   	Blower switch ON (Vol: 3)	Below 111 Ω

NG	REPLACE SEAT HEATER SWITCH

OK

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

1. Disconnect the J45 and J59 connectors.

2. Measure the resistance according to the value(s) in the table below.(*): RHD models

   Resistance:

   Tester Connection	Condition	Specified Condition
   LHD models: J45-7 (RH) - J59-2 (SW-5)	Always	Below 1 Ω
   RHD models: J45-7 (RH) - J59-3 (SW-5)	Always	Below 1 Ω
   J45-8 (ASS5) - J59-7 (S5-4)	Always	Below 1 Ω
   J45-10 (SGND) - J59-10 (SG-4)	Always	Below 1 Ω
   J45-12 (E) - Body ground	Always	Below 1 Ω
   J45-7 (RH) - J59-2 (SW-5)	Always	10 kΩ or higher
   J45-8 (ASS5) - J59-7 (S5-4)	Always	10 kΩ or higher

NG	REPAIR OR REPLACE WIRE HARNESS

OK
REPLACE A/C AMPLIFIER ASSEMBLY

14. CHECK WIRE HARNESS

1. Disconnect the U12 (T12) connector.

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

*1: Front LH
*2: Front RH

Resistance:

Front LH:

Tester Connection	Condition	Specified Condition
U12-4 (GND) - Body ground	Always	Below 1 Ω

Front RH:

Tester Connection	Condition	Specified Condition
T12-4 (GND) - Body ground	Always	Below 1 Ω

Voltage:

Front LH:

Tester Connection	Condition	Specified Condition
U12-1 (IG) - Body ground	Engine switch on (IG)	10 to 14 V

Front RH:

Tester Connection	Condition	Specified Condition
T12-4 (GND) - Body ground	Always	Below 1 Ω

3. Reconnect the U12 (T12) connector.

4. Disconnect the U13 (T13) connector.

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

*1: Front LH
*2: Front RH

Resistance:

Front LH:

Tester Connection	Condition	Specified Condition
U13-1 (GND) - Body ground	Always	Below 1 Ω

Front RH:

Tester Connection	Condition	Specified Condition
T13-1 (GND) - Body ground	Always	Below 1 Ω

Voltage:

Front LH:

Tester Connection	Condition	Specified Condition
U13-2 (IG) - Body ground	Engine switch on (IG)	10 to 14 V

Front RH:

Tester Connection	Condition	Specified Condition
U13-2 (IG) - Body ground	Engine switch on (IG)	10 to 14 V

NG	REPAIR OR REPLACE WIRE HARNESS

OK

15. INSPECT SEAT CLIMATE CONTROL BLOWER

1. 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.

      Item	Condition
      Tool setting	2 V/DIV., 500 μsec/DIV.,
      Vehicle condition	Engine switch on (IG), seat heater switch ON

      OK:

      The waveform is displayed as shown in the illustration.
      

*1: Front LH
*2: Front RH

Result:

NG	A
OK (Seat cushion blower side)	B
OK (Seatback blower side)	C

B	REPLACE SEAT CUSHION BLOWER
C	REPLACE SEATBACK BLOWER

A

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

1. Disconnect the J59, U12 (T12) and U13 (T13) connectors.

*1: Front LH
*2: Front RH

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

   Resistance:

   Front LH:

   Tester Connection	Condition	Specified Condition
   RHD models: J59-8 (LOUT) - U12-3 (SIGN)	Always	Below 1 Ω
   RHD models: J59-8 (LOUT) - U13-3 (FCTB)	Always	Below 1 Ω
   RHD models: J59-8 (LOUT) - Body ground	Always	10 kΩ or higher
   LHD models: J59-16 (LOUT) - U12-3 (SIGN)	Always	Below 1 Ω
   LHD models: J59-16 (LOUT) - U13-3 (FCTB)	Always	Below 1 Ω
   LHD models: J59-16 (LOUT) - Body ground	Always	10 kΩ or higher

   Front RH:

   Tester Connection	Condition	Specified Condition
   LHD models: J59-8 (ROUT) - T12-3 (SIGN)	Always	Below 1 Ω
   LHD models: J59-8 (ROUT) - T13-3 (VSVG)	Always	Below 1 Ω
   LHD models: J59-8 (ROUT) - Body ground	Always	10 kΩ or higher
   RHD models: J59-16 (ROUT) - T12-3 (SIGN)	Always	Below 1 Ω
   RHD models: J59-16 (ROUT) - T13-3 (VSVG)	Always	Below 1 Ω
   RHD models: J59-16 (ROUT) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE WIRE HARNESS

OK

17. CHECK WIRE HARNESS (SEAT HEATER SWITCH)

1. Disconnect the J45 connector.

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

   Resistance:

   Tester Connection	Condition	Specified Condition
   J45-12 (E) - Body ground	Always	Below 1 Ω

   Voltage:

   Tester Connection	Condition	Specified Condition
   J45-5 (IG) - Body ground	Engine switch on (IG)	10 to 14 V

NG	REPAIR OR REPLACE WIRE HARNESS

OK

18. INSPECT SEAT HEATER SWITCH

1. Disconnect the J45 switch.

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

   Resistance:

   Front LH:

   Tester Connection	Condition	Specified Condition
   J45-8 (ASS5) - J45-10 (SGND)	Always	Below 1 kΩ
   J45-9 (LH) - J45-10 (SGND)	Blower switch OFF	Below 1.1 kΩ
   	Blower switch ON (Vol: 3)	Below 111 Ω

   Front RH:

   Tester Connection	Condition	Specified Condition
   J45-8 (ASS5) - J45-10 (SGND)	Always	Below 1 kΩ
   J45-7 (RH) - J45-10 (SGND)	Blower switch OFF	Below 1.1 kΩ
   	Blower switch ON (Vol: 3)	Below 111 Ω

NG	REPLACE SEAT HEATER SWITCH

OK

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

1. Disconnect the J45 and J59 connectors.

2. Measure the resistance according to the value(s) in the table below.(*): RHD models
   

   Resistance:

   Front LH:

   Tester Connection	Condition	Specified Condition
   J45-8 (ASS5) - J59-7 (S5-4)	Always	Below 1 Ω
   LHD models: J45-9 (LH) - J59-3 (SW-4)	Always	Below 1 Ω
   RHD models: J45-9 (LH) - J59-2 (SW-4)	Always	Below 1 Ω
   J45-10 (SGND) - J59-10 (SG-4)	Always	Below 1 Ω
   J45-12 (E) - Body ground	Always	Below 1 Ω
   J45-8 (ASS5) - Body ground	Always	10 kΩ or higher
   J45-9 (LH) - Body ground	Always	10 kΩ or higher

   Front RH:

   Tester Connection	Condition	Specified Condition
   LHD models: J45-7 (RH) - J59-2 (SW-5)	Always	Below 1 Ω
   RHD models: J45-7 (RH) - J59-3 (SW-5)	Always	Below 1 Ω
   J45-8 (ASS5) - J59-7 (S5-4)	Always	Below 1 Ω
   J45-10 (SGND) - J59-10 (SG-4)	Always	Below 1 Ω
   J45-12 (E) - Body ground	Always	Below 1 Ω
   J45-7 (RH) - Body ground	Always	10 kΩ or higher
   J45-8 (ASS5) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE WIRE HARNESS

OK
REPLACE A/C AMPLIFIER ASSEMBLY