Diagnosis Procedure
WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK SEAT BACK HEATER INPUT SIGNAL
- Turn the ignition switch ON.
- Check voltage between seat back heater/blower harness connector and ground.
(+)
(-)
Condition
Voltage (V)
(Approx.)
Seat back heater/blower
Connector
Terminal
LH
B230
1
2
Climate controlled seat switch (LH)
HEAT (HI)
0 - 12*
Other than above
0
RH
B330
1
2
Climate controlled seat switch (RH)
HEAT (HI)
0 - 12*
Other than above
0
Is the inspection result normal?
YES
Replace seat back heater. Refer to Front Seat Heater .
NO
GO TO 2.
- CHECK SEAT BACK HEATER CIRCUIT
- Turn the ignition switch OFF.
- Disconnect climate controlled seat control unit connector and seat back heater/blower connector.
- Check continuity between climate controlled seat control unit harness connector and seat back heater/blower harness connector.
Climate controlled seat control unit
Seat back heater/blower
Continuity
Connector
Terminal
Connector
Terminal
LH
B201
3
B230
1
Yes
12
2
RH
B301
3
B330
1
12
2
- Check continuity between climate controlled seat control unit harness connector and ground.
Climate controlled seat control unit
Ground
Continuity
Connector
Terminal
LH
B201
3
No
12
RH
B301
3
12
Is the inspection result normal?
YES
Replace climate controlled seat control unit. Refer to Exploded View .
NO
Repair or replace harness.