Circuit/System Testing

Ignition OFF, disconnect the harness connector at the appropriate M53 Seat Lumbar Support Motor.
Connect a test lamp between control circuit terminal A and control circuit terminal B, ignition ON.
Verify the test lamp turns ON when commanding the lumbar support forward and rearward using the lumbar switch.
- If the test lamp remains OFF during either of the commands
1. Ignition OFF.
2. Test for infinite resistance between each control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
3. Test for less than 2 Ω in each control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, test or replace the S64 Seat Adjuster Switch.
- If the test lamp turns ON during each of the commands
Test or replace the M53 Seat Lumbar Support Motor.