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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 (With A45) >> Circuit/System Testing

Circuit/System Testing

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Driver Mirror FoldMalfunction

    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@X510 Inline Harness Connector
  3. Test for less than 10 ohms between the test points:Control circuit terminal 4 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector:S146 Window/Outside Rearview Mirror Switch - Driver
    2. Test for less than 2 ohms between the test points:Control circuit terminal 4@X510 Inline Harness Connector & Control circuit terminal 22@S146 Window/Outside Rearview Mirror Switch - Driver
      • 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
    • Go to next step: If less than 10 ohms 
  4. Test for less than 10 ohms between the test points:Control circuit terminal 18 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector:S146 Window/Outside Rearview Mirror Switch - Driver@X510 Inline Harness Connector
    2. Test for less than 2 ohms between the test points:Control circuit terminal 18@X510 Inline Harness Connector & Control circuit terminal 12@S146 Window/Outside Rearview Mirror Switch - Driver
      • 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
    • Go to next step: If less than 10 ohms 
  5. Connect a test lamp between the test points:Control circuit terminal 4 & Control circuit terminal 18
  6. Ignition - On / Vehicle - In Service Mode
  7. Perform the scan tool control function:Mirror Fold - Fold & Unfold

    Verify the test lamp state:

    Mirror Fold - Fold = Test lamp On

    Mirror Fold - Unfold = Test lamp On

    • If not the specified state 
    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@Component harness & Ground
      • Control 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 - Replace the component:S146 Window/Outside Rearview Mirror Switch - Driver
    • Go to next step: If the specified state 
  8. Test or replace the component:A9A Outside Rearview Mirror - Driver

Passenger Mirror FoldMalfunction

    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:A9B Outside Rearview Mirror - Passenger@X610 Inline Harness Connector
  3. Test for less than 10 ohms between the test points:Control circuit terminal 4 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector:S79P Window Switch - Passenger
    2. Test for less than 2 ohms between the test points:Control circuit terminal 4@X610 Inline Harness Connector & Control circuit terminal 22@S79P Window Switch - Passenger
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:S79P Window Switch - Passenger
    • Go to next step: If less than 10 ohms 
  4. Test for less than 10 ohms between the test points:Control circuit terminal 18 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector:S79P Window Switch - Passenger
    2. Test for less than 2 ohms between the test points:Control circuit terminal 18@X610 Inline Harness Connector & Control circuit terminal 12@S79P Window Switch - Passenger
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:S79P Window Switch - Passenger
    • Go to next step: If less than 10 ohms 
  5. Connect a test lamp between the test points:Control circuit terminal 4 & Control circuit terminal 18
  6. Ignition - On / Vehicle - In Service Mode
  7. Perform the scan tool control function:Mirror Fold - Fold & Unfold

    Verify the test lamp state:

    Mirror Fold - Fold = Test lamp On

    Mirror Fold - Unfold = Test lamp On

    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:S79P Window Switch - Passenger
    3. Test for infinite resistance between the test points:
      • Control circuit terminal 4@Component harness & Ground
      • Control 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 - Replace the component:S79P Window Switch - Passenger
    • Go to next step: If the specified state 
  8. Test or replace the component:A9B Outside Rearview Mirror - Passenger
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