Diagnosis Procedure
- CHECK SEAT CUSHION THERMAL ELECTRIC DEVICE SIGNAL
- Turn ignition switch ON.
- Check voltage between seat cushion thermal electric device LH harness connector B203 and seat cushion thermal electric device RH harness connector B312 and ground.
(+)
(-)
Condition
Voltage
(Approx.)
Seat cushion thermal electric device
Connector
Terminal
LH
B203
1
Ground
Climate controlled seat switch
HEAT or COOL
0V - 12V*
Other than above
0V
2
HEAT or COOL
0V - 12V*
Other than above
0V
RH
B312
1
Climate controlled seat switch
HEAT or COOL
0V - 12V*
Other than above
0V
2
HEAT or COOL
0V - 12V*
Other than above
0V
* : It changes between 12V and 0V.
NOTE: Wait 1 minute or more after the activation start, and then start the measurement.
Is the inspection result normal?
YES
Replace seat cushion thermal electric device. Refer to Seat Cushion .
NO
GO TO 2 .
- CHECK SEAT CUSHION THERMAL ELECTRIC DEVICE CIRCUIT
- Turn ignition switch OFF.
- Disconnect climate controlled seat control unit LH connector B230 and climate controlled seat control unit RH connector B305 and seat cushion thermal electric device LH connector B203 and seat cushion thermal electric device RH connector B312.
- Check continuity between climate controlled seat control unit LH connector B230 and climate controlled seat control unit RH connector B305 and seat cushion thermal electric device LH connector B203 and seat cushion thermal electric device RH connector B312.
Climate controlled seat control unit
Seat cushion thermal electric device
Continuity
Connector
Terminal
Connector
Terminal
LH
B230
29
B203
1
Yes
26
2
RH
B305
29
B312
1
26
2
- Check continuity between climate controlled seat control unit LH connector B230 and climate controlled seat control unit RH connector B305 and ground.
Climate controlled seat control unit
(-)
Continuity
Connector
Terminal
LH
B230
29
Ground
No
26
RH
B305
29
26
Is the inspection result normal?
YES
Replace climate controlled seat control unit. Refer to Removal and Installation .
NO
Repair or replace harness.