Circuit/System Testing

Ignition OFF and all vehicle systems OFF, disconnect the KR2 Headlamp Washer Pump Relay. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10Ω between the ground circuit terminal 86 and ground.
- If 10Ω or greater
1. Test for less than 2Ω in the ground circuit end to end.
  - If 2Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2Ω, repair the open/high resistance in the ground connection.
- If less than 10Ω
Ignition ON.
Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
- If the test lamp does not illuminate and the circuit fuse is good
  Replace the X50A Fuse Block - Underhood.
- If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the G16 Headlamp Washer Pump.
2. Test for infinite resistance between the control circuit terminal 2 and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the G16 Headlamp Washer Pump.
- If the test lamp illuminates
Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86.
Verify the test lamp turns ON and OFF when commanding the Headlamp Washer Relay Active and Inactive with a scan tool.
- If the test lamp is always OFF
1. Ignition OFF, remove the test lamp, disconnect the X5 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the control circuit terminal 26 and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
3. Test for less than 2Ω in the control circuit end to end.
  - If 2Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2Ω, replace the K9 Body Control Module.
- If the test lamp is always ON
1. Ignition OFF, remove the test lamp, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1V between the control circuit and ground.
  - If 1V or greater, repair the short to voltage on the circuit.
  - If less than 1V, replace the K9 Body Control Module.
- If the test lamp turns ON and OFF
Verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
- If the test lamp illuminates
  Repair the short to voltage on the control circuit
- If the test lamp does not illuminate
Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the G19 Headlamp Washer Pump. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10Ω between the ground circuit terminal 1 and ground.
- If 10Ω or greater
1. Test for less than 2Ω in the ground circuit end to end.
  - If 2Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2Ω, repair the open/high resistance in the ground connection.
- If less than 10Ω
Connect the harness connector at the G19 Headlamp Washer Pump.
Ignition ON, connect a 15A fused jumper wire between the control circuit terminal 87 and B+.
Verify the G19 Headlamp Washer Pump is activated.
- If the G19 Headlamp Washer Pump does not activate
1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the G19 Headlamp Washer Pump.
2. Test for less than 2Ω in the control circuit end to end.
  - If 2Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2Ω, replace the G19 Headlamp Washer Pump.
- If the G19 Headlamp Washer Pump activates
Test or replace the KR2 Headlamp Washer Pump Relay.