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

Seating

Pinpoint Test AA: The Heated Seat Does Not Operate Correctly - Left 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

When the left rear heated seat is command on, voltage is then supplied to the left rear heated seat switch from the heated seat module on either circuit CHS48 (high heat mode) or circuit CHS49 (low heat mode) and grounded on circuit GD114, illuminating the switch indicator.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Heated seat switch

- Heated seat module

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

AA1 CHECK THE INDICATOR CIRCUITS FOR A SHORT TO GROUND

- Disconnect: Left Rear Heated Seat Switch C320.

- Disconnect: Heated Seat Module C3304A.

- Measure the resistance between:
- heated seat module C3304A-4, circuit CHS49 (VT), harness side and ground.

- heated seat module C3304A-5, circuit CHS48 (YE), harness side and ground.






Are the resistances greater than 10,000 ohms?

Yes
GO to AA2.

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

AA2 CHECK THE INDICATOR CIRCUITS FOR AN OPEN

- Measure the resistance between:
- left rear heated seat switch C320-3, circuit CHS49 (VT), harness side and heated seat module C3304A-4, circuit CHS49 (VT), harness side.

- left rear heated seat switch C320-4, circuit CHS48 (YE), harness side and heated seat module C3304A-5, circuit CHS48 (YE), harness side.






Are the resistances less than 5 ohms?

Yes
GO to AA3.

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

AA3 CHECK THE HEATED SEAT HIGH INDICATOR

- Connect: Left Rear Heated Seat Switch C320.

- Ignition ON.

- Connect a fused jumper lead between heated seat module C3304A-5, circuit CHS48 (YE), harness side and C3304B-1, circuit SBP18 (YE/RD), harness side.





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

Yes
GO to AA4.

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

AA4 CHECK THE HEATED SEAT LOW INDICATOR

- Connect a fused jumper lead between heated seat module C3304A-4, circuit CHS49 (VT), harness side and C3304B-1, circuit SBP18 (YE/RD), harness side.





Does the low indicator illuminate on the left 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.