LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Mirror System) >> Diagnostic Information and Procedures >> Power Mirror Malfunction (With 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.

Test 1

    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:S146 Window/Outside Rearview Mirror Switch - Driver
  3. Test for less than 10 ohms between the test points:Ground circuit terminal 24 & Ground
    • If 10 ohms or greater 
    1. Disconnect the ground connection:Ground
    2. Test for less than 2 ohms between the test points:Ground circuit terminal 24 & Ground terminal G305
      • 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 
  4. Verify a test lamp turns On between the test points:B+ circuit terminal 23 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points: B+ circuit terminal 23 & The other end of the circuit @
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for infinite resistance between the test points:B+ circuit terminal 23 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:S146 Window/Outside Rearview Mirror Switch - Driver
    • Go to next step: If the test lamp turns On 
  5. Test or replace the component:S146 Window/Outside Rearview Mirror Switch - Driver

Test 2

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:A9A Outside Rearview Mirror - Driver@X510 Inline Harness Connector

    Ignition - On / Vehicle - In Service Mode

  3. Connect a test lamp between the test points:Control circuit terminal 9 & Control circuit terminal 12
  4. Ignition - On / Vehicle - In Service Mode
  5. Perform the scan tool control function:Mirror Movement = Up/Down

    Verify the test lamp state:

    Mirror Direction Switch - Up = Test lamp On

    Mirror Direction Switch - Down = Test lamp On

    • 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 9@Component harness & Ground
      • Control circuit terminal 12@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 & The other end of the circuit
      • 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 9@Component harness & Ground
      • Control circuit terminal 12@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 
  6. Connect a test lamp between the test points:Control circuit terminal 10 & Control circuit terminal 12
  7. Perform the scan tool control function:Mirror Movement = Left/Right

    Verify the test lamp state:

    Mirror Direction Switch - Left = Test lamp On

    Mirror Direction Switch - Right = Test lamp On

    • 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 10@Component harness & Ground
      • Control circuit terminal 12@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 & The other end of the circuit
      • 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 
    5. Ignition/Vehicle - Off & Remove - Test lamp
    6. Disconnect the electrical connector:S146 Window/Outside Rearview Mirror Switch - Driver
    7. Ignition - On / Vehicle - In Service Mode
    8. Test for less than 1 V between the test points:
      • Control circuit terminal 10@Component harness & Ground
      • Control circuit terminal 12@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 
  8. Test or replace the component:M77D Outside Rearview Mirror Motor - Driver

Test 3

  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:Low Reference circuit terminal 3 & 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:Low Reference circuit terminal 3@A9 Outside Rearview Mirror & The other end of the circuit
      • 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. Ignition - On / Vehicle - In Service Mode
  5. Test for 4.8 to 5.2 V between the test points:@5 V Reference circuit terminal 17 & Ground
    • If less than 4.8 V 
    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:5 V Reference circuit terminal 17 @A9 Outside Rearview Mirror & 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:5 V Reference circuit terminal 17 & The other end of the circuit
      • 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 greater than 5.2 V 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector:@S146 Window/Outside Rearview Mirror Switch - Driver
    3. Ignition On
    4. Test for less than 1 V between the test points:5 V Reference circuit terminal 17@A9 Outside Rearview Mirror & 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 between 4.8 and 5.2 V 
  6. Verify the scan tool parameter:Driver Mirror Vertical Position = Less than 4.6 V
    • If 4.6 V or greater 
    1. Ignition/Vehicle & All vehicle systems - Off
    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:Signal circuit terminal 14@A9 Outside Rearview Mirror & 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 less than 4.6 V 
  7. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 14 & 5 V Reference circuit terminal 17
  8. Verify the scan tool parameter:Driver Mirror Vertical Position = Greater than 0.6 V
    • If 0.6 V or less 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector:@S146 Window/Outside Rearview Mirror Switch - Driver
    3. Test for infinite resistance between the test points:Signal circuit terminal 14 @A9 Outside Rearview Mirror & 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:Signal circuit terminal 14@A9 Outside Rearview Mirror & The other end of the circuit
      • 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 greater than 0.6 V 
  9. Verify the scan tool parameter:Driver Mirror Horizontal Position = Less than 4.6 V
    • If 4.6 V or greater 
    1. Ignition/Vehicle & All vehicle systems - Off
    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:Signal circuit terminal 7@A9 Outside Rearview Mirror & 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 less than 4.6 V 
  10. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 7 & 5 V Reference circuit terminal 17
  11. Verify the scan tool parameter:Driver Mirror Horizontal PositionGreater than 0.6 V
    • If 0.6 V or less 
    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:Signal circuit terminal 7 @A9 Outside Rearview Mirror & 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:Signal circuit terminal 7@A9 Outside Rearview Mirror & The other end of the circuit
      • 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 greater than 0.6 V 
  12. Test or replace the component:M77D Outside Rearview Mirror Motor - Driver

Test 4

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:A9B Outside Rearview Mirror - Passenger@X610 Inline Harness Connector
  3. Ignition - On / Vehicle - In Service Mode
  4. Connect a test lamp between the test points:Control circuit terminal 9 & Control circuit terminal 12
  5. Perform the scan tool control function:Mirror Movement = Up/Down

    Verify the test lamp state:

    Mirror Direction Switch - Up = Test lamp On

    Mirror Direction Switch - Down = Test lamp On

    • If the test lamp is always Off 
    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 9@Component harness & Ground
      • Control circuit terminal 12@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@A9 Outside Rearview Mirror & The other end of the circuit
      • 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
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:S79P Window Switch - Passenger
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:
      • Control circuit terminal 9@Component harness & Ground
      • Control circuit terminal 12@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:S79P Window Switch - Passenger
    • Go to next step: If the test lamp turns On and Off 
  6. Connect a test lamp between the test points:Control circuit terminal 10 & Control circuit terminal 12
  7. Ignition - On / Vehicle - In Service Mode
  8. Perform the scan tool control function:Mirror Movement = Left/Right

    Verify the test lamp state:

    Mirror Direction Switch - Left = Test lamp On

    Mirror Direction Switch - Right = Test lamp On

    • If the test lamp is always Off 
    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 10@Component harness & Ground
      • Control circuit terminal 12@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@A9 Outside Rearview Mirror & The other end of the circuit
      • 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
      • If the test lamp is always On 
    5. Ignition/Vehicle - Off & Remove - Test lamp
    6. Disconnect the electrical connector:S79P Window Switch - Passenger
    7. Ignition - On / Vehicle - In Service Mode
    8. Test for less than 1 V between the test points:
      • Control circuit terminal 10@Component harness & Ground
      • Control circuit terminal 12@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:S79P Window Switch - Passenger
      • Go to next step: If the test lamp turns On and Off 
  9. Test or replace the component:M77P Outside Rearview Mirror Motor - Passenger

Test 5

  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:Low Reference circuit terminal 3 & Ground
    • If 10 ohms or greater 
    1. Disconnect the ground connection:Ground@S79P Window Switch - Passenger
    2. Test for less than 2 ohms between the test points:Low Reference circuit terminal 3@A9 Outside Rearview Mirror & The other end of the circuit
      • 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. Ignition - On / Vehicle - In Service Mode
  5. Test for 4.8 to 5.2 V between the test points:@5 V Reference circuit terminal 17 & Ground
    • If less than 4.8 V 
    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:5 V Reference circuit terminal 17 @A9 Outside Rearview Mirror & 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:5 V Reference circuit terminal 17@A9 Outside Rearview Mirror & The other end of the circuit
      • 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
    • If greater than 5.2 V 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector:@S79P Window Switch - Passenger
    3. Test for less than 1 V between the test points:5 V Reference circuit terminal 17@A9 Outside Rearview Mirror & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:S79P Window Switch - Passenger
    • Go to next step: If between 4.8 and 5.2 V 
  6. Verify the scan tool parameter:Passenger Mirror Vertical PositionLess than 4.6 V
    • If 4.6 V or greater 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector:@S79P Window Switch - Passenger
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Signal circuit terminal 14@A9 Outside Rearview Mirror & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:S79P Window Switch - Passenger
      • Go to next step: If less than 4.6 V 
  7. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 14 & 5 V Reference circuit terminal 17
  8. Verify the scan tool parameter:Passenger Mirror Vertical PositionGreater than 0.6 V
    • If 0.6 V or less 
    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:Signal circuit terminal 14 @A9 Outside Rearview Mirror & 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:Signal circuit terminal 14@A9 Outside Rearview Mirror & The other end of the circuit
      • 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 greater than 0.6 V 
  9. Verify the scan tool parameter:Passenger Mirror Horizontal PositionLess than 4.6 V
    • If 4.6 V or greater 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector:@S79P Window Switch - Passenger
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Signal circuit terminal 7@A9 Outside Rearview Mirror & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:S79P Window Switch - Passenger
      • Go to next step: If less than 4.6 V 
  10. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 7 & 5 V Reference circuit terminal 17
  11. Verify the scan tool parameter:Passenger Mirror Horizontal PositionGreater than 0.6 V
    • If 0.6 V or less 
    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:Signal circuit terminal 7 @A9 Outside Rearview Mirror & 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:Signal circuit terminal 7@A9 Outside Rearview Mirror & The other end of the circuit
      • 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 greater than 0.6 V 
  12. Test or replace the component:M77P Outside Rearview Mirror Motor - Passenger
scientia non olet · About LEMON Manuals