Pinpoint Test R: Right Rear Seat Does Heat But the Heated Seat Indicator Does Not Illuminate When Pressed

Seats

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

Normal Operation

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

A new heated seat module must be configured after installation for correct operation. To configure, press the low heat mode button on either rear heated seat switch. Module configuration will occur automatically after the low heat mode button is pressed. Until the module is correctly configured, the heated seats will operate incorrectly when selecting the high heat mode by following a sequence of high, low and off with each button press. The system will operate correctly after the heated seat module receives a low heat request on either of the low heat request circuits and rear heated seat module configuration is activated.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Heated seat switch

- Heated seat module

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

R1 CHECK CIRCUITS CHS53 (WH/BN) AND CHS52 (BU) 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 R2.

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

R2 CHECK CIRCUITS CHS53 (WH/BN) AND CHS52 (BU) FOR AN OPEN

- Measure the resistance between:
- right rear heated seat switch C321-3, circuit CHS53 (WH/BN), harness side and heated seat module C3304A-10, circuit CHS53 (WH/BN), harness side.

- right rear heated seat switch C321-4, 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 R3.

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

R3 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 LED illuminate on the right rear heated seat switch?

Yes
GO to R4.

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

R4 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 LED 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.