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Home >> Buick >> 2017 >> Envision Base >> 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 KR2 Headlamp Washer Pump Relay. It may take up to 2 min 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.
    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. Ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.
    • If the test lamp does not illuminate and the circuit fuse is OK 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the B+ end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Disconnect the harness connector at the G16 Headlamp Washer Pump.
    4. 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
    5. Connect the KR2 Headlamp Washer Pump Relay and install a new fuse.
    6. Connect a test lamp between the control circuit terminal 2 and ground, ignition ON.
    7. Verify the test lamp turns On and Off when commanding the Headlamp Washer Relay Command Active and Inactive with a scan tool.
      • If the test lamp does not turn On and Off, replace the relay.
      • If the test lamp turns On and Off, test or replace the G16 Headlamp Washer Pump.
    • If the test lamp illuminates 
  5. Connect a test lamp between the control circuit terminal 2 and the ground circuit terminal 1.
  6. Verify the test lamp turns ON and OFF when commanding the Headlamp Washer Relay Command 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 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 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 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
    • If the test lamp turns ON and OFF 
  7. Verify that a test lamp does not illuminate between the control circuit terminal 5 and ground.
    • If the test lamp illuminates 

      Repair the short to voltage on the control circuit

    • If the test lamp does not illuminate 
  8. Ignition OFF and all vehicle systems OFF, remove the test lamp, disconnect the harness connector at the G16 Headlamp Washer Pump. It may take up to 2 min for all vehicle systems to power down.
  9. Test for less than 10 Ω between the ground circuit terminal 1 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 
  10. Connect the harness connector at the G16 Headlamp Washer Pump.
  11. Ignition ON, connect a 30 A fused jumper wire between the B+ circuit terminal 3 and the control circuit terminal 5.
  12. Verify the G16 Headlamp Washer Pump is activated.
    • If the G16 Headlamp Washer Pump does not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the G16 Headlamp Washer Pump.
    2. 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 
  13. Test or replace the KR2 Headlamp Washer Pump Relay.
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