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.

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector:S146 Window/Outside Rearview Mirror Switch - Driver

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
  - 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
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 & Output terminal @
  - 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
3. Test for infinite resistance between the test points:
  - Control circuit terminal 2 & Ground
  - Control circuit terminal 3 & Ground
  - Control circuit terminal 4 & Ground
  - Control circuit terminal 6 & Ground
  - Control circuit terminal 7 & Ground
  - Control circuit terminal 8 & Ground
    - If less than infinite resistance - Repair the short to ground on the circuit.
    - If infinite resistance - Replace the appropriate component:M77 Outside Rearview Mirror Motor
- Go to next step: If the test lamp turns On
Test or replace the component:S146 Window/Outside Rearview Mirror Switch - Driver

Test 2

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector:A9A Outside Rearview Mirror - Driver@X510 Inline Harness Connector
Connect a test lamp between the test points:Control circuit terminal 9 & Control circuit terminal 12
Ignition - On / Vehicle - In Service Mode
Operate the component:S146 Window/Outside Rearview Mirror Switch - Driver - 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@S146 Window/Outside Rearview Mirror Switch - Driver & 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 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
Connect a test lamp between the test points:Control circuit terminal 10 & Control circuit terminal 12
Ignition - On / Vehicle - In Service Mode
Operate the component:S146 Window/Outside Rearview Mirror Switch - Driver = 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@S146 Window/Outside Rearview Mirror Switch - Driver & 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
Test or replace the component:M77D Outside Rearview Mirror Motor - Driver

Test 3

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector:A9A Outside Rearview Mirror - Driver@X610 Inline Harness Connector
Connect a test lamp between the test points:Control circuit terminal 9 & Control circuit terminal 12
Ignition - On / Vehicle - In Service Mode
Operate the component:S146 Window/Outside Rearview Mirror Switch - Driver = 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@S146 Window/Outside Rearview Mirror Switch - Driver & 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 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
Connect a test lamp between the test points:Control circuit terminal 10 & Control circuit terminal 12
Ignition - On / Vehicle - In Service Mode
Operate the component:S146 Window/Outside Rearview Mirror Switch - Driver = 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@S146 Window/Outside Rearview Mirror Switch - Driver & 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
Test or replace the component:M77P Outside Rearview Mirror Motor - Passenger