Circuit/System Testing

Seat Adjuster Switch Circuit Test

1. Ignition OFF, disconnect the harness connector at the seat adjuster switch.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal E and ground.
   • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Verify the scan tool switch parameter is Inactive.
   • If not the specified value, test the affected signal circuit terminal listed for a short to voltage. If the circuit tests normal, replace the memory seat module.
     • Recline forward terminal F
     • Recline rearward terminal A
     • Horizontal forward terminal D
     • Horizontal rearward terminal C
     • Rear down terminal G
     • Rear up terminal J
     • Front up terminal K
     • Front down terminal H
4. Install a 3A fused jumper wire between the affected signal circuit terminal listed and the B+ circuit terminal E. Verify the scan tool switch parameter is the desired direction.
   • Recline forward terminal F
   • Recline rearward terminal A
   • Horizontal forward terminal D
   • Horizontal rearward terminal C
   • Rear down terminal G
   • Rear up terminal J
   • Front up terminal K
   • Front down terminal H
   • If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the memory seat module.
5. If all circuits test normal, test or replace the seat adjuster switch.

Lumbar Switch Circuit Test

1. Ignition OFF, disconnect the harness connector at the lumbar switch.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal E and ground.
   • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Verify the scan tool switch parameter is Inactive.
   • If not the specified value, test the affected signal circuit terminal listed for a short to voltage. If the circuit tests normal, replace the memory seat module.
     • Lumbar forward terminal A
     • Lumbar rearward terminal D
4. Install a 3A fused jumper wire between the affected signal circuit terminal listed and the B+ circuit terminal E. Verify the scan tool switch parameter is the desired direction.
   • Lumbar forward terminal A
   • Lumbar rearward terminal D
   • If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the memory seat module.
5. If all circuits test normal, test or replace the lumbar switch.

Motor Control Circuit Test

1. Ignition OFF, disconnect the X1 harness connector at the MSM.
2. Verify that a test lamp illuminates between the B+ circuit terminal C and ground.
   • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Connect the X1 harness connector at the MSM.
4. Ignition OFF, disconnect the harness connector at the affected seat motor.
5. Ignition OFF, test for less than 1.0 ohm of resistance between the control circuit terminal A and ground.
   • If greater than the specified range, test the control circuit for an open/high resistance. If circuits test normal, replace the MSM.
6. Ignition OFF, test for less than 1.0 ohm of resistance between the control circuit terminal B and ground.
   • If greater than the specified range, test the control circuit for an open/high resistance. If circuits test normal, replace the MSM.
7. Connect a test lamp between control circuit terminal A and control circuit terminal B.
8. Command the affected seat motor in both directions with a scan tool. The test lamp should turn ON when commanding the motor in both directions.
   • If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the MSM.
9. If all circuits test normal, test or replace the affected motor assembly.