Heated Seat Switch Indicator Malfunction
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the appropriate heated seat switch.
- Ignition ON, verify that a test lamp illuminates between the control circuit terminal 2 and ground. If the test lamp does not illuminate, refer to Interior Backlighting Malfunction (w/AN3) or Interior Backlighting Malfunction (w/o AN3) .
- Ignition OFF, connect the harness connector at the heated seat switch.
- Disconnect the X3, X4 harness connectors at the heated seat module.
- Ignition ON, connect a test lamp between the control circuits listed below and ground. The appropriate indicator should turn ON and OFF when the test lamp is connected and disconnected.
- Driver seat high heat indicator terminal 5 X3
- Driver seat medium heat indicator terminal 16 X4
- Driver seat low heat indicator terminal 4 X3
- Driver seat back and cushion heat indicator terminal 17 X4
- Driver seat back heat indicator terminal 15 X4
- Passenger seat high heat indicator terminal 10 X3
- Passenger seat medium heat indicator terminal 6 X4
- Passenger seat low heat indicator terminal 9 X3
- Passenger seat back and cushion heat indicator terminal 7 X4
- Passenger seat back heat indicator terminal 18 X4
- If the test lamp is always ON, test the appropriate control circuit for a short to ground. If the circuit tests normal, test or replace the heated seat switch.
- If the test lamp is always OFF, test the appropriate control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the heated seat switch.
- If all circuits test normal, replace the HSM.