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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System And Washer System >> Diagnostic Information and Procedures >> DTC B3810: Headlamp Washer Relay Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF. Disconnect the harness connector at the G16 Headlamp Washer Pump. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF/Vehicle 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 a test lamp between the control circuit terminal 1 and the ground circuit terminal 2, ignition ON/vehicle in Service Mode.
  4. Verify the test lamp does NOT turn ON and OFF when commanding the Headlamp Washer Relay Active and Inactive with a scan tool.
    • If the test lamp turns ON and OFF 

      Test or replace the G16 Headlamp Washer Pump.

    • If the test lamp does not turn ON and OFF 
  5. Ignition OFF/Vehicle OFF, connect the harness connector at the G16 Headlamp Washer Pump. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood, It may take up to 2 minutes for all vehicle systems to power down.
  6. Test for less than 10 Ω between the ground circuit terminal 38 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF/Vehicle 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 
  7. Ignition ON/Vehicle in Service Mode.
  8. Verify the G16 Headlamp Washer Pump is not activated.
    • If the G16 Headlamp Washer Pump is activated 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the G16 Headlamp Washer Pump, ignition ON/vehicle in Service Mode.
    2. Test for less than 1 V between the control circuit terminal 1 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the G16 Headlamp Washer Pump.
    • If the G16 Headlamp Washer Pump is not activated 
  9. Connect a 20 A fused jumper wire between the control circuit terminal 26 and B+.
  10. Verify the G16 Headlamp Washer Pump activates.
    • If the G16 Headlamp Washer Pump does not activate 
    1. Ignition OFF/Vehicle OFF, remove the jumper wire, disconnect the harness connector at the G16 Headlamp Washer Pump.
    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, replace the G16 Headlamp Washer Pump.
    • If the G16 Headlamp Washer Pump activates 
  11. Ignition OFF/Vehicle OFF, connect the X2 harness connector at the X50A Fuse Block - Underhood. Disconnect the X5 harness connector at the K9 Body Control Module, ignition ON/vehicle in Service Mode.
  12. Verify the G16 Headlamp Washer Pump is not activated.
    • If the G16 Headlamp Washer Pump is activated 
    1. Ignition OFF/Vehicle OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood, ignition ON/vehicle in Service Mode.
    2. Test for less than 1 V between the control circuit terminal 6 X1 and B+.
      • 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 G16 Headlamp Washer Pump is not activated 
  13. Connect a 10 A fused jumper wire between the control circuit terminal 26 and B+.
  14. Verify the G16 Headlamp Washer Pump activates.
    • If the G16 Headlamp Washer Pump does not activate 
    1. Ignition OFF/Vehicle OFF, remove the jumper wire, disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
    2. Test for infinite resistance between the control circuit terminal 6 X1 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 G16 Headlamp Washer Pump activates 
  15. Replace the K9 Body Control Module.
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