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Circuit/System Testing

Both Outside Rearview Mirrors Inoperative

  1. Vehicle OFF, disconnect the harness connector at the S146 Window/Outside Rearview Mirror Switch-Driver. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 24 and ground.
    • If 10 Ω or greater 
    1. Vehicle 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 
  3. Verify a test lamp illuminates between the B+ circuit terminal 23 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Vehicle 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. Vehicle 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:
      • Control circuit terminal 2
      • Control circuit terminal 3
      • Control circuit terminal 4
      • Control circuit terminal 6
      • Control circuit terminal 7
      • Control circuit terminal 8
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S146 Window/Outside Rearview Mirror Switch-Driver.
    • If the test lamp illuminates 
  4. Test or replace the S146 Window/Outside Rearview Mirror Switch-Driver.

Driver Outside Mirror Movement Malfunction

  1. Vehicle OFF, disconnect the harness connector at the M77D Outside Rearview Mirror Motor-Driver. Vehicle in Service Mode
  2. Connect a test lamp between the control circuit terminal 2 and control circuit terminal 3.
  3. Verify the test lamp turns ON when commanding the UP and DOWN states with the S146 Window/Outside Rearview Mirror Switch-Driver.
    • If the test lamp remains OFF during either of the commands 
    1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the S146 Window/Outside Rearview Mirror Switch-Driver.
    2. 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
    3. 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, test or replace the S146 Window/Outside Rearview Mirror Switch-Driver.
    • If the test lamp is always ON 
    1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the S146 Window/Outside Rearview Mirror Switch-Driver, Vehicle in Service Mode.
    2. Test for less than 1 V between each control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the S146 Window/Outside Rearview Mirror Switch-Driver
    • If the test lamp turns ON during each of the commands 
  4. Connect a test lamp between the control circuit terminal 1 and control circuit terminal 2.
  5. Verify the test lamp turns ON when commanding the LEFT and RIGHT states with the S146 Window/Outside Rearview Mirror Switch-Driver.
    • If the test lamp remains OFF during either of the commands 
    1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the S146 Window/Outside Rearview Mirror Switch-Driver.
    2. 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
    3. 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, test or replace the S146 Window/Outside Rearview Mirror Switch-Driver.
    • If the test lamp is always ON 
    1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the S146 Window/Outside Rearview Mirror Switch-Driver, Vehicle in Service Mode.
    2. Test for less than 1 V between each control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the S146 Window/Outside Rearview Mirror Switch-Driver
    • If the test lamp turns ON during each of the commands 
  6. Test or replace the M77D Outside Rearview Mirror Motor-Driver.

Passenger Outside Mirror Movement Malfunction

  1. Vehicle OFF, disconnect the harness connector at the M77P Outside Rearview Mirror Motor-Passenger. Vehicle in Service Mode
  2. Connect a test lamp between the control circuit terminal 2 and control circuit terminal 3.
  3. Verify the test lamp turns ON when commanding the UP and DOWN states with the S146 Window/Outside Rearview Mirror Switch-Driver.
    • If the test lamp remains OFF during either of the commands 
    1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the S146 Window/Outside Rearview Mirror Switch-Driver.
    2. 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
    3. 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, test or replace the S146 Window/Outside Rearview Mirror Switch-Driver.
    • If the test lamp is always ON 
    1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the S146 Window/Outside Rearview Mirror Switch-Driver, Vehicle in Service Mode.
    2. Test for less than 1 V between each control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the S146 Window/Outside Rearview Mirror Switch-Driver
    • If the test lamp turns ON during each of the commands 
  4. Connect a test lamp between the control circuit terminal 1 and control circuit terminal 2.
  5. Verify the test lamp turns ON when commanding the LEFT and RIGHT states with the S146 Window/Outside Rearview Mirror Switch-Driver.
    • If the test lamp remains OFF during either of the commands 
    1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the S146 Window/Outside Rearview Mirror Switch-Driver.
    2. 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
    3. 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, test or replace the S146 Window/Outside Rearview Mirror Switch-Driver.
    • If the test lamp is always ON 
    1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the S146 Window/Outside Rearview Mirror Switch-Driver, Vehicle in Service Mode.
    2. Test for less than 1 V between each control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the S146 Window/Outside Rearview Mirror Switch-Driver
    • If the test lamp turns ON during each of the commands 
  6. Test or replace the M77P Outside Rearview Mirror Motor-Passenger.
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