The driver door module (DDM) and passenger door module (PDM) determine the position of the outside rearview mirrors based on inputs from two mirror position sensors, one for vertical position, the other for horizontal position. 5 volts is applied to each sensor through a shared 5-volt reference circuit and a shared low reference circuit supplies ground. Each sensor has an individual signal circuit which is referenced from ground and provides position voltage to the DDM/PDM.

Battery voltage must be between 9-16 volts.

B1580

An improper voltage level is seen on the horizontal position sensor signal circuit.

B1590

An improper voltage level is seen the vertical position sensor signal circuit.

Memory mirror recall functions are suspended as long as the fault is present.

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Outside Mirror Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool Mirror Horizontal Position and Mirror Vertical Position parameters. The reading should be between 0.2-4.8 volts and change as the mirror is moved, left, right, up, and down.

1. Ignition OFF, disconnect the harness connector at the appropriate outside rearview mirror.
2. Ignition OFF, wait 1 minute, test for less than 1.0 ohm between the low reference circuit terminal 12 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 appropriate door module.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 9 and ground.

⇒	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.

⇒	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.

4. Install a 3A fused jumper wire between the signal circuit terminal 10 and the 5-volt reference circuit terminal 9. Verify the scan tool Mirror Vertical Position parameter is greater than 4.8 volts.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the door module.

5. Install a 3A fused jumper wire between the signal circuit terminal 11 and the 5-volt reference circuit terminal 9. Verify the scan tool Mirror Horizontal Position parameter is greater than 4.8 volts.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the door module.

6. Install a 3A fused jumper wire between the signal circuit terminal 10 and the low reference circuit terminal 12. Verify the scan tool Mirror Vertical Position parameter is less than 0.2 volt.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the door module.

7. Install a 3A fused jumper wire between the signal circuit terminal 11 and the low reference circuit terminal 12. Verify the scan tool Mirror Horizontal Position parameter is less than 0.2 volt.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the door module.

8. If all circuits test normal, test or replace the outside rearview mirror motor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.