Circuit/System Testing

Mirror Motor Circuit Test

1. Ignition OFF, disconnect the X1 harness connector at the appropriate outside rearview mirror.
2. Connect a test lamp between mirror motor UP control circuit terminal A and mirror motor DOWN control circuit terminal C.
3. Command the mirror to the UP and DOWN positions with a scan tool. The test lamp should turn ON when commanding the Up and DOWN states.
   • If the test lamp remains OFF during either of the commands, test for a short to voltage, short to ground or an open/high resistance on either control circuit. If the circuit tests normal, replace the door module.
4. Connect a test lamp between mirror motor LEFT control circuit terminal H and mirror motor RIGHT control circuit terminal F.
5. Command the mirror to the LEFT and RIGHT positions with a scan tool. The test lamp should turn ON when commanding the LEFT and RIGHT states.
   • If the test lamp remains OFF during either of the commands, test for a short to voltage, short to ground or an open/high resistance on either control circuit. If the circuit tests normal, replace the door module.
6. If all circuits test normal, test or replace the outside rearview mirror motor.

Mirror Position Sensor Circuit Test

1. Ignition OFF, disconnect the X2 harness connector at the appropriate outside rearview mirror.
2. Wait 1 minute, test for less than 1.0 ohm between the low reference circuit terminal C and ground.
   • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the door module.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.
   • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the door module.
   • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the door module.
4. Verify the listed scan tool parameter is greater than 4.8 volts.
   • Mirror Horizontal Position
   • Mirror Vertical Position

• If less than the specified range, test the listed signal circuit terminal for a short to ground. If the circuit tests normal, replace the door module.
  • Horizontal terminal D
  • Vertical terminal B
• Install a 3A fused jumper wire between the listed signal circuit terminal and the low reference circuit terminal 4. Verify the scan tool parameter is less than 0.2 volt.
  • Horizontal terminal D
  • Vertical terminal B
  • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the door module.
• If all circuits test normal, test or replace the outside rearview mirror motor.