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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Mirror System) >> Diagnostic Information and Procedures >> Power Mirror Folding Malfunction (Without A45) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:
    • A9A Outside Rearview Mirror - Driver@Component harness & X510 Inline Harness Connector
    • A9B Outside Rearview Mirror - Passenger@Component harness & X610 Inline Harness Connector
  1. Connect a test lamp between the test points:Control circuit terminal 4 & Control circuit terminal 18
  2. Verify the component turns On and Off when connecting and disconnecting the jumper wire: - Operate the component:S146 Window/Outside Rearview Mirror Switch - Driver - PressedFold/Unfold
    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:S146 Window/Outside Rearview Mirror Switch - Driver
    3. Test for infinite resistance between the test points:Control circuit terminal 4 orControl circuit terminal 18@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 ohms between the test points:Control circuit terminal 4 orControl circuit terminal 18@Component harness & The other end of the circuit@GroundTerminal
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:S146 Window/Outside Rearview Mirror Switch - Driver
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:S146 Window/Outside Rearview Mirror Switch - Driver
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Control circuit terminal 4 orControl circuit terminal 18@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:S146 Window/Outside Rearview Mirror Switch - Driver
    • Go to next step: If the test lamp turns On and Off 
  3. Test or replace the component:A9 Outside Rearview Mirror
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