Circuit/System Testing

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch. It may take up to 2 minutes for all vehicle systems to power down.
Test for less than 10 Ω between the ground circuit terminal 5 and ground.
- If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, repair the open/high resistance in the ground connection.
- If less than 10 Ω
Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.
- If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF.
2. Test for less than 2 Ω in the B+ circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
- If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF.
2. Test for infinite resistance between the B+ circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
3. Test for infinite resistance between each of the control circuit terminals listed below and ground:
  - Terminal 1 control circuit
  - Terminal 2 control circuit
  - Terminal 3 control circuit
  - Terminal 7 control circuit
  - Terminal 8 control circuit
  - Terminal 9 control circuit
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the S52 Outside Rearview Mirror Switch.
- If the test lamp illuminates
Ignition OFF, connect the harness connector at the S52 Outside Rearview Mirror Switch and disconnect the harness connector at the appropriate A9 Outside Rearview Mirror.
Connect a test lamp between the control circuit terminal A and the control circuit terminal B.
Verify the test lamp illuminates when commanding the UP/DOWN states with the S52 Outside Rearview Mirror Switch.
- If the test lamp does not illuminate during either of the commands
1. Ignition OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch.
2. Test for less than 1 V on each control circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V
3. Test for infinite resistance between each control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
4. Test for less than 2 Ω in each control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace at the S52 Outside Rearview Mirror Switch.
- If the test lamp illuminates during each of the commands
Connect a test lamp between the control circuit terminal A and the control circuit terminal C.
Verify the test lamp illuminates when commanding the LEFT/RIGHT states with the S52 Outside Rearview Mirror Switch.
- If the test lamp does not illuminate during either of the commands
1. Ignition OFF, disconnect the harness connector at the S52 Outside Rearview Mirror Switch.
2. Test for less than 1 V on each control circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V
3. Test for infinite resistance between each control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
4. Test for less than 2 Ω in each control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace at the S52 Outside Rearview Mirror Switch.
- If the test lamp illuminates during each of the commands
Test or replace the Outside Rearview Mirror Inner Actuator.