Circuit/System Testing

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

Heated Seats Inoperative

Ignition OFF, disconnect the harness connector at the appropriate heated seat switch.
Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal D and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Ignition OFF, connect the harness connector at the heated seat switch. Disconnect the harness connector at the appropriate heated seat module.
Test for less than 1 ohm between the ground circuit terminal 4 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Place the heated seat switch in the high position. Verify that a test lamp illuminates between the signal circuit terminal 8 and ground.
- If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the heated seat switch.
Place the heated seat switch in the low position. Verify that a test lamp illuminates between the signal circuit terminal 8 and ground.
- If the test lamp does not illuminate, test or replace the heated seat switch.
Place the heated seat switch in the high position. Test for B+ between the signal circuit terminal 3 and ground.
- If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the heated seat switch.
Place the heated seat switch in the low position. Test for B+ between the signal circuit terminal 3 and ground.
- If not the specified value, test or replace the heated seat switch.
Ignition OFF, disconnect the harness connector at the heated seat element - cushion.
Test for less than 1 ohm between the ground circuit terminal C and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
Test for less than 5 ohms between the control terminal D and ground.
- If not within the specified range, test the following circuits for a short to ground or an open/high resistance.
  - Control circuit between the heated seat element - cushion terminal D and the heated seat element - back terminal A.
  - Heated seat element - back ground circuit terminal B and ground If the circuits test normal, test or replace the heated seat element - back.
Connect the harness connector at the heated seat element - cushion.
Test for less than 10 ohms between the control circuit terminal 7 and ground.
- If not within the specified range, test the control circuit for a short to ground or open/high resistance. If the circuits test normal, test or replace the Heated Seat Element - Cushion
Test for 1200-10K ohms between the control circuit terminal 6 and ground.
- If not within the specified range, test the control circuit for a short to ground or open/high resistance. If the circuits test normal, test or replace the Heated Seat Element - Cushion.
If all circuits test normal, replace the heated seat module.

Heated Seats Indicator Circuit Inoperative

Ignition OFF, disconnect the harness connector at the appropriate heated seat switch.
Test for less than 1 ohm between the ground circuit terminal E and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
If all circuits test normal, replace the heated seat switch.