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Circuit/System Testing

WARNING: This page is about a different car, the 2021 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the appropriate electrical connector:
    • X510 @ A9A Outside Rearview Mirror - Driver
    • X610 @ A9B Outside Rearview Mirror - Passenger
  3. Verify a test lamp turns On between the test points: Ground circuit terminal 5 & B+
    • If the test lamp does not turn On 
    1. Test for less than 2 Ω between the test points: Ground circuit terminal 5 @ Component harness & Ground circuit terminal
      • 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.
    • Go to next step: If the test lamp turns On 
    4. NOTE:

    Make sure to use a high impedance test lamp like special tool EL-35616-210.

  4. Connect a test lamp between the test points: Control circuit terminal 15 & Ground
  5. Perform the scan tool control function: Object Detection Alert Indicators - On & Off

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: B218R Side Object Sensor Module - Right
    3. Test for infinite resistance between the test points: Control circuit terminal 15 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 Ω between the test points: Control circuit terminal 15 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component: B218R Side Object Sensor Module - Right
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: B218R Side Object Sensor Module - Right
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 15 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: B218R Side Object Sensor Module - Right
    • Go to next step: If the test lamp turns On and Off 
  6. Test or replace the component: E17 Outside Rearview Mirror Glass
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