Circuit/System Testing

Ignition OFF and all vehicle systems OFF, disconnect the harness at the P28 Speaker - Parking Assist. It may take up to 2 min for all vehicle systems to power down.
Ignition ON.
Verify a test lamp illuminates between the 12V reference circuit terminal 1 and ground.
- If the test lamp does not illuminate
1. Ignition OFF, disconnect the X2 harness connector at the K41R Rear Parking Assist Control Module.
2. Test for infinite resistance between the 12V reference circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - Go to the step below: If infinite resistance
3. Test for less than 2 Ω in the 12V reference circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K41R Rear Parking Assist Control Module.
- Go to next step: If the test lamp illuminates
Ignition OFF.
While cycling the key from OFF to ON, test for greater than 11V between the signal circuit terminal 1 and terminal 2.
- If less than 11V
1. Ignition OFF, disconnect the X2 harness connector at the K41R Rear Parking Assist Control Module, ignition ON.
2. Test for less than 1V between the signal circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
3. Ignition OFF, disconnect the X2 harness connector at the K41R Rear Parking Assist Control Module.
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.
5. Test for infinite resistance between the signal circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the K41R Rear Parking Assist Control Module.
- Go to next step: If greater than 11V
Test or replace the P28 Speaker - Parking Assist.