Circuit/System Testing

Heated Seat Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate heated seat switch.
2. 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.
3. 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
4. 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.
5. 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.
6. If all circuits test normal, test or replace the heated seat switch.

Heated Seat Switch Indicator Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate heated seat switch.
2. 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) .
3. Ignition OFF, connect the harness connector at the heated seat switch.
4. Disconnect the X3, X4 harness connectors at the heated seat module.
5. 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.