Circuit/System Testing

Mirror Motor Circuit Test

1. Ignition OFF, disconnect the X4 harness connector at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the following control circuit terminals and ground:
   • Control circuit terminal 1
   • Control circuit terminal 2
   • Control circuit terminal 5
   • If the test lamp illuminates, test the appropriate control circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the following control circuits and ground:
   • Control circuit terminal 1
   • Control circuit terminal 2
   • Control circuit terminal 5
4. Test for 20-120 ohms between the control circuit terminal 1 and the control circuit terminal 2.
   • If not within the specified range, test both control circuits for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
5. Test for 20-120 ohms between the control circuit terminal 5 and the control circuit terminal 2.
   • If not within the specified range, test both control circuits for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
6. If all circuits test normal, replace the appropriate door module.

Mirror Position Sensor Circuit Test

1. Ignition OFF, disconnect the X3 harness connector at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground:
   • 5-volt reference circuit terminal 7
   • Signal circuit terminal 2
   • Signal circuit terminal 3
   • Low reference circuit terminal 6
   • If the test lamp illuminates, test the appropriate circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the following circuits and ground:
   • 5-volt reference circuit terminal 7
   • Signal circuit terminal 2
   • Signal circuit terminal 3
   • Low reference circuit terminal 6
   • If less than the specified value, test the appropriate circuit for a short to ground.
4. Test for 4K-7K ohms between the 5-volt reference circuit terminal 7 and the low reference circuit terminal 6.
   • If not within the specified range, test the 5-volt reference circuit and the low reference circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
5. Test for 1K-7K ohms between the 5-volt reference circuit terminal 7 and the signal circuit terminal 2.
   • If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
6. Test for 1K-7K ohms between the 5-volt reference circuit terminal 7 and the signal circuit terminal 3.
   • If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror .
7. If all circuits test normal, replace the door module.