Circuit/System Testing

Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between the ground circuit terminal 53 and ground.
- If 10 Ω or greater
1. Ignition 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 10 Ω
Connect the X1 harness connector at the X50A Fuse Block - Underhood and Disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
Verify the M45 Rear Wiper Motor is not activated.
- If the M45 Rear Wiper Motor is activated
1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
2. Test for less than 1 V between the control circuit terminal 16 and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the X50A Fuse Block - Underhood.
- If the M45 Rear Wiper Motor is not activated
Connect a 10 A fused jumper wire between the control circuit terminal 8 and B+.
Verify the M45 Rear Wiper Motor activates.
- If the M45 Rear Wiper Motor does not activate
1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood.
2. Test for infinite resistance between the control circuit terminal 16 and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If less than 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, test or replace the X50A Fuse Block - Underhood.
- If the M45 Rear Wiper Motor activates
Test or replace the K9 Body Control Module.