Heated Seat Switch 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.
- Test for less than 10 Ω between the ground circuit terminal 7 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify the appropriate scan tool Heated Seat Module parameter listed below is Off.
- Driver Seat HVC Mode
- Passenger Seat HVC Mode
- If not the specified value, test the signal circuits listed below for a short to ground. If the circuits test normal, replace the HSM.
- Seat cushion and back signal terminal 4
- Seat back only signal terminal 5
- Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify the appropriate scan tool Heated Seat Module parameter listed below is Back & Cushion.
- Driver Seat HVC Mode
- Passenger Seat HVC Mode
- If not the specified value, test the signal circuit for a short to voltage an open/high resistance. If the circuit tests normal, replace the HSM.
- Install a 3 A fused jumper wire between the signal circuit terminal 5 and ground. Verify the appropriate scan tool Heated Seat Module parameter listed below is Back Only.
- Driver Seat HVC Mode
- Passenger Seat HVC Mode
- If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HSM.
- If all circuits test normal, test or replace the heated seat switch.