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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Mirror System) >> Diagnostic Information and Procedures >> Heated Mirrors Malfunction >> 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:A9 Outside Rearview Mirror@X510 or X610 Inline Harness Connector
  3. Test for less than 10 ohms between the test points:Ground circuit terminal 11 & Ground
    • If 10 ohms or greater 
    1. Disconnect the ground connection:
    2. Test for less than 2 ohms between the test points:Ground circuit terminal 11 & 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 - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  1. Ignition - On / Vehicle - In Service Mode
  2. Connect a test lamp between the test points:Control circuit terminal 8 & Ground circuit terminal 11
  3. Perform the scan tool control function:Rear Defogger - 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:X50A Fuse Block - Underhood
    3. Test for infinite resistance between the test points:Control circuit terminal 8 @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 8@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:E17 Outside Rearview Mirror Glass
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:X50A Fuse Block - Underhood
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Control circuit terminal 8@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:X50A Fuse Block - Underhood
    • Go to next step: If the test lamp turns On and Off 
  4. Test or replace the component:E17 Outside Rearview Mirror Glass
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