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Circuit/System Testing

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

Parking Assist Switch Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel.
  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 the scan tool Parking Assist Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module.
    2. Test for infinite resistance between the control circuit terminal 5 and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • If infinite resistance, replace the K41R Rear Parking Assist Control Module.
    • If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and ground.
  6. Verify the scan tool Parking Assist Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the X1 harness connector at the K41R Rear Parking Assist Control Module.
    2. 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 K41R Rear Parking Assist Control Module.
    • If Active 
  7. Replace S48D Multifunction Switch 2 - Instrument Panel.

Parking Assist Switch Indicator Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the S48D Multifunction Switch 2 - Instrument Panel, ignition ON.
  2. Verify a test lamp illuminates when placed between the PWM voltage control terminal 3 and ground.
    NOTE:

    Verify vehicle interior dimming control is set all the way bright.

    • If the test lamp illuminates 
  3. Connect a test lamp between PWM voltage control circuit terminal 3 and the control circuit terminal 6
  4. Verify the test lamp turns ON and OFF while commanding the Parking Assist Switch LED output control On and Off with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module.
    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
    3. Ignition OFF.
    4. 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 K41R Rear Parking Assist Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist 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, replace the K41R Rear Parking Assist Control Module.
    • If the test lamp turns ON and OFF 
  5. Test or replace the S48D Multifunction Switch 2 - Instrument Panel.
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