Pinpoint Test AB: The Heated Seat Does Not Operate Correctly - Right Rear Seat Does Heat But the Heated Seat Indicator Does Not

Seating

Pinpoint Test AB: The Heated Seat Does Not Operate Correctly - Right Rear Seat Does Heat But the Heated Seat Indicator Does Not Illuminate When Pressed

Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number

Normal Operation

Pressing the right rear heated seat switch once in either the high or low mode will activate the right rear heated seat. Voltage is then supplied from the heated seat module to the appropriate switch indicator circuit CHS52 (high heat mode) or circuit CHS53 (low heat mode) to illuminate the switch indicator. Pressing the switch button again (in the same mode) will deactivate the seat and indicator.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Heated seat switch

- Heated seat module

PINPOINT TEST AB : THE HEATED SEAT DOES NOT OPERATE CORRECTLY - RIGHT REAR SEAT DOES HEAT BUT THE HEATED SEAT INDICATOR DOES NOT ILLUMINATE WHEN PRESSED

AB1 CHECK THE INDICATOR CIRCUITS FOR A SHORT TO GROUND

- Disconnect: Right Rear Heated Seat Switch C321.

- Disconnect: Heated Seat Module C3304A.

- Measure the resistance between:
- heated seat module C3304A-10, circuit CHS53 (WH/BN), harness side and ground.

- heated seat module C3304A-11, circuit CHS52 (BU), harness side and ground.






Are the resistances greater than 10,000 ohms?

Yes
GO to AB2.

No
REPAIR the affected circuit. TEST the system for normal operation.

AB2 CHECK THE INDICATOR CIRCUITS FOR AN OPEN

- Measure the resistance between:
- right rear heated seat switch C321-4, circuit CHS53 (WH/BN), harness side and heated seat module C3304A-10, circuit CHS53 (WH/BN), harness side.

- right rear heated seat switch C321-3, circuit CHS52 (BU), harness side and heated seat module C3304A-11, circuit CHS52 (BU), harness side.






Are the resistances less than 5 ohms?

Yes
GO to AB3.

No
REPAIR the affected circuit. TEST the system for normal operation.

AB3 CHECK THE HEATED SEAT HIGH INDICATOR

- Connect: Right Rear Heated Seat Switch C321.

- Ignition ON.

- Connect a fused jumper lead between heated seat module C3304A-11, circuit CHS52 (BU), harness side and C3304B-1, circuit SBP18 (YE/RD), harness side.





Does the high indicator illuminate on the right rear heated seat switch?

Yes
GO to AB4.

No
INSTALL a new rear heated seat switch. REFER to Heated Seat Switch - Rear . TEST the system for normal operation.

AB4 CHECK THE HEATED SEAT LOW INDICATOR

- Connect a fused jumper lead between heated seat module C3304A-10, circuit CHS53 (WH/BN), harness side and C3304B-1, circuit SBP18 (YE/RD), harness side.





Does the low indicator illuminate on the right rear heated seat switch?

Yes
INSTALL a new heated seat module. REFER to Heated Seat Module - Rear . TEST the system for normal operation.

No
INSTALL a new rear heated seat switch. REFER to Heated Seat Switch - Rear . TEST the system for normal operation.