LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2013 >> Encore Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 101 (Wiper System And Washer System) >> Diagnostic Information and Procedures >> DTC B3873: Front Washer Relay >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page is about a different car, the 2016 Chevrolet Trax and 2016 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

Washer Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 2 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. Verify the scan tool Windshield Washer Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal 5 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the low reference circuit terminal 2.
  6. Verify the scan tool Windshield Washer Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    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 Active 
  7. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Washer Pump Malfunction

  1. Ignition OFF, and all vehicle systems OFF. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood. 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 C5 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 
  3. Connect the X2 harness connector and disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
  4. Test for infinite resistance between each of the control circuit terminals listed below and ground.
    • Terminal G3
    • Terminal H3
    • If less than Infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  5. Connect the X1 harness connector at the X50A Fuse Block - Underhood. Disconnect the harness connector at the G24 Windshield Washer Pump, ignition ON.
  6. Test for less than 1 V between the control circuit terminals listed below and ground:
    • Terminal 1
    • Terminal 2
    • If 1 V or greater 
    1. Ignition OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
    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, test or replace the X50A Fuse Block - Underhood.
    • If less than 1 V 
  7. Ignition OFF, and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.
  8. Test for less than 10 Ω between the control circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse Block - Underhood.
    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 X50A Fuse Block - Underhood.
    • If less than 10 Ω 
  9. Test for less than 10 Ω between the control circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the X1 harness connectors at the X50A Fuse Block - Underhood.
    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 X50A Fuse Block - Underhood.
    • If less than 10 Ω 
  10. Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2, ignition ON.
  11. Verify the test lamp does NOT turn ON and OFF when commanding the rear washer ON and OFF with the rear washer switch.
    • 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 
  12. Ignition OFF, connect the harness connector at the G24 Windshield Washer Pump. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON.
  13. Connect a test lamp between the control circuit terminal G9 and ground.
  14. Verify the test lamp turns ON and OFF when commanding the Windshield Washer Relay Active with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp. Disconnect the X4 harness connector at the K9 Body Control Module.
    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 short to ground on 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 X4 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 2 Ω or greater, repair the short to voltage on the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module
    • If the test lamp turns ON and OFF. 
  15. Test or replace the X50A Fuse Block - Underhood.
scientia non olet · About LEMON Manuals