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Circuit/System Testing

Rear Wiper/Washer Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the X3 harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the low 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 K9 Body Control Module.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Test for greater than 8 V between the signal circuit terminal 5 and ground.
    • If less than 8 V 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. 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
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If 8 V or greater 
  5. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
  6. Test for less than 1 V between the S82 Windshield Wiper/Washer Switch signal circuit terminal 5 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  7. Test or replace the S82 Windshield Wiper/Washer Switch.

Rear Washer Pump Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood. It may take up to 10 min for all vehicle systems to power down.
  2. 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 
  3. Connect the X1 harness connector at the X50A Fuse Block - Underhood, disconnect the harness connector at the G19 Rear Window Washer Pump. It may take up to 2 min for all vehicle systems to power down.
  4. Test for less than 10 Ω between the ground circuit terminal 2 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 
  5. Connect a test lamp between the control circuit terminal 1 and ground, ignition ON.
  6. Verify the test lamp does not turn ON and OFF when commanding the Rear Washer Relay Active and Inactive with a scan tool.
    • If the test lamp turns ON and OFF 

      Test or replace the G19 Rear Window Washer Pump.

    • If the test lamp does not turn ON and OFF 
  7. Ignition OFF, connect the harness connector at the G19 Rear Window Washer Pump. Disconnect the X1 harness connector at the X50A Fuse Block-Underhood, ignition ON.
  8. Verify the G19 Rear Window Washer Pump is not activated.
    • If the G19 Rear Window Washer Pump is activated 
    1. Ignition OFF, disconnect the harness connector at the G19 Rear Window Washer Pump, ignition ON.
    2. Test for less than 1 V between the control circuit terminal 55 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the G19 Rear Window Washer Pump.
    • If the G19 Rear Window Washer Pump is not activated 
  9. Connect a 15 A fused jumper wire between the control circuit terminal 55 and B+.
  10. Verify the G19 Rear Window Washer Pump activates.
    • If the G19 Rear Window Washer Pump does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the G19 Rear Window Washer Pump, ignition ON.
    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 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 G19 Rear Window Washer Pump.
    • If the G19 Rear Window Washer Pump activates 
  11. Ignition OFF, X4 harness connector at the K9 Body Control Module, ignition ON.
  12. Verify the G19 Rear Window Washer Pump is not activated.
    • If the G19 Rear Window Washer Pump is activated 
    1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block-Underhood.
    2. Test for less than 1 volt between the K9 Body Control Module control circuit terminal 9 X5 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the X50A Fuse Block-Underhood.
  13. Connect a 3 A fused jumper wire between the control circuit terminal 9 and B+.
  14. Verify the G19 Rear Window Washer Pump activates.
    • If the G19 Rear Window Washer Pump does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block-Underhood, ignition ON.
    2. Test for infinite resistance between the control circuit terminal 52 and ground.
      • If less than Infinite resistance, repair the short to ground on the circuit.
      • If 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 G19 Rear Window Washer Pump activates 
  15. Replace the K9 Body Control Module.
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