Circuit/System Testing

Ignition OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console, ignition ON.
Verify a test lamp illuminates between the control circuit terminal 3 and ground.
- If the test lamp does not illuminate
1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. 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, refer to Interior Backlighting Malfunction .
- If the test lamp illuminates
Connect a test lamp between the control circuit terminal 3 and the control circuit terminal 6.
Verify the test lamp turns ON and OFF when commanding the Parking Assist Switch LED On and Off with a scan tool.
- If the test lamp is always OFF
1. Ignition OFF, disconnect the X1 harness connector at the K41 Front and Rear Parking Assist Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V
3. Ignition OFF.
4. 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 K41 Front and Rear Parking Assist Control Module.
- If the test lamp is always ON
1. Ignition OFF, disconnect the X1 harness connector at the K41 Front and Rear Parking Assist Control Module.
2. Test for infinite resistance between the control circuit and ground.
  - If less than infinite resistance, repair the short to ground in the circuit.
  - If infinite resistance, replace the K41 Front and Rear Parking Assist Control Module.
- If the test lamp turns ON and OFF
Test or replace the S48E Multifunction Switch - Center Console.