Outside Rearview Mirror Switch Circuit Testing
- Ignition OFF, disconnect the harness connector at the outside rearview mirror switch.
- Test for less than 1 Ω of resistance between the ground circuit and ground.
- If greater than 1 Ω, test the ground circuit for an open/high resistance.
- Ignition ON, verify that a test lamp illuminates between the voltage supply circuit and ground.
- If the test lamp does not illuminate, repair the voltage supply circuit for a short to ground or an open/high resistance. If the voltage supply circuit fuse is open, also test the signal circuit for a short to ground.
- If all circuits test normal, test or replace the outside rearview mirror switch.