DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
SYSTEM CHECK
CHECK WIRE HARNESS
INSPECT SEAT CLIMATE CONTROL BLOWER
CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER)
CHECK WIRE HARNESS (SEAT HEATER SWITCH)
INSPECT SEAT HEATER SWITCH
CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY)
CHECK WIRE HARNESS
INSPECT SEAT CLIMATE CONTROL BLOWER
CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER)
CHECK WIRE HARNESS (SEAT HEATER SWITCH)
INSPECT SEAT HEATER SWITCH
CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY)
CHECK WIRE HARNESS
INSPECT SEAT CLIMATE CONTROL BLOWER
CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER)
CHECK WIRE HARNESS (SEAT HEATER SWITCH)
INSPECT SEAT HEATER SWITCH
CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY)
CLIMATE CONTROL SEAT SYSTEM - 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
| 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 |
Disconnect the U12 connector.
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 |
Reconnect the U12 connector.
Disconnect the U13 connector.
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 |
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| 3.INSPECT SEAT CLIMATE CONTROL BLOWER |
Check the input signal waveform.
Connect the oscilloscope to terminal 3 and body ground with the climate control blower connector still connected.
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 |
| | REPLACE SEAT CUSHION BLOWER |
|
|
| |
|
| 4.CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER) |
Disconnect the J59, U12 and U13 connectors.
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 |
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| 5.CHECK WIRE HARNESS (SEAT HEATER SWITCH) |
Disconnect the J45 connector.
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 |
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| 6.INSPECT SEAT HEATER SWITCH |
Disconnect the J45 switch.
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 |
| | REPLACE SEAT HEATER SWITCH |
|
|
| 7.CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY) |
Disconnect the J45 and J59 connectors.
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 |
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| OK | |
| |
| REPLACE A/C AMPLIFIER ASSEMBLY |
|
Disconnect the T12 connector.
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 |
Reconnect the T12 connector.
Disconnect the T13 connector.
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 |
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| 9.INSPECT SEAT CLIMATE CONTROL BLOWER |
Check the input signal waveform.
Connect the oscilloscope to terminal 3 and body ground with the climate control blower connector still connected.
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 |
| | REPLACE SEAT CUSHION BLOWER |
|
|
| |
|
| 10.CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER) |
Disconnect the J59, T12 and T13 connectors.
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 |
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| 11.CHECK WIRE HARNESS (SEAT HEATER SWITCH) |
Disconnect the J45 connector.
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 |
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| 12.INSPECT SEAT HEATER SWITCH |
Disconnect the J45 switch.
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 |
| | REPLACE SEAT HEATER SWITCH |
|
|
| 13.CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY) |
Disconnect the J45 and J59 connectors.
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 |
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| OK | |
| |
| REPLACE A/C AMPLIFIER ASSEMBLY |
|
Disconnect the U12 (T12) connector.
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 |
Reconnect the U12 (T12) connector.
Disconnect the U13 (T13) connector.
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 |
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| 15.INSPECT SEAT CLIMATE CONTROL BLOWER |
Check the input signal waveform.
Connect the oscilloscope to terminal 3 and body ground with the climate control blower connector still connected.
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 |
| | REPLACE SEAT CUSHION BLOWER |
|
|
| |
|
| 16.CHECK WIRE HARNESS (A/C AMPLIFIER ASSEMBLY - SEAT CLIMATE CONTROL BLOWER) |
Disconnect the J59, U12 (T12) and U13 (T13) connectors.
*1: Front LH
*2: Front RH
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 |
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| 17.CHECK WIRE HARNESS (SEAT HEATER SWITCH) |
Disconnect the J45 connector.
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 |
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| 18.INSPECT SEAT HEATER SWITCH |
Disconnect the J45 switch.
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 |
| | REPLACE SEAT HEATER SWITCH |
|
|
| 19.CHECK WIRE HARNESS (SEAT HEATER SWITCH - A/C AMPLIFIER ASSEMBLY) |
Disconnect the J45 and J59 connectors.
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 |
| | REPAIR OR REPLACE WIRE HARNESS |
|
|
| OK | |
| |
| REPLACE A/C AMPLIFIER ASSEMBLY |
|
