Circuit/System Testing

Vehicle OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S83 Vehicle ON/OFF Switch. It may take up to 2 min for all vehicle systems to power down.
Test for less than 5 Ω between the ground circuit terminal 4 and ground.
- If 5 Ω or greater
1. Vehicle OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, repair the open/high resistance in the ground connection.
- If less than 5 Ω
Connect a test lamp between the control circuit terminal 8 and ground, vehicle in Service Mode, park lamps ON.
Verify the test lamp intensity changes from low to high as the S36 Instrument Panel Dimmer Switch is activated from low to high backlighting intensity.
- If the test lamp is always OFF
1. Vehicle OFF, disconnect the X7 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the 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 the control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K9 Body Control Module.
- If the test lamp is always ON full intensity
1. Vehicle OFF, disconnect the X7 harness connector at the K9 Body Control Module, vehicle in Service Mode.
2. Test for less than 1 V between the control circuit terminal and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the K9 Body Control Module.
- If the test lamp dims from LOW to HIGH
Test or replace the S83 Vehicle ON/OFF Switch.