Circuit/System Testing

Ignition OFF, and all vehicle systems OFF. Disconnect the X2 and X3 harness connectors 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 5 and ground.
- If 10 Ω or greater
1. 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
Test for infinite resistance between each control circuit listed below and ground:
1. Terminal 2 X2
2. Terminal 1 X2
- If less than Infinite resistance
  Repair the short to ground on the circuit.
- If infinite resistance
Disconnect the harness connector at the G24 Windshield Washer Pump and connect the X2 and X3 harness connectors at the X50A Fuse Block - Underhood.
Test for less than 10 Ω between the control circuit terminal 1 and the control circuit terminal 2.
- If 10 Ω or greater
1. Ignition OFF, disconnect the X2 harness connectors at the X50A Fuse Block - Underhood.
2. Test for less than 2 Ω in each of the control circuits listed below end to end:
  - Terminal 2
  - Terminal 1
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the X50A Fuse Block - Underhood.
- If less than 10 Ω
Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
Verify the test lamp does NOT turn ON and OFF when commanding the Rear Window Washer Relay Active and Inactive with a scan tool.
- If the test lamp turns ON and OFF
  Test or replace the G24 Windshield Washer Pump.
- If the test lamp does not turn ON and OFF
Ignition OFF, connect the harness connector at the G24 Windshield Washer Pump, ignition ON.
Verify the G24 Windshield Washer Pump is NOT activated.
- If the G24 Windshield Washer Pump is activated
1. Ignition OFF, disconnect the harness connector at the G24 Windshield Washer Pump, ignition ON.
2. Test for less than 1 V between each of the control circuits listed below and ground:
  - Terminal 1
  - Terminal 2
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the G24 Windshield Washer Pump.
- If the G24 Windshield Washer Pump is not activated
Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
Verify the G24 Windshield Washer Pump is NOT activated.
- If the G24 Windshield Washer Pump 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 10 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 G24 Windshield Washer Pump is not activated
Connect a 10 A fused jumper wire between the control circuit terminal 11 and B+.
Verify the G24 Windshield Washer Pump activates.
- If the G24 Windshield Washer Pump 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 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 G24 Windshield Washer Pump activates
Replace the K9 Body Control Module.