The driver door module (DDM) and passenger door module (PDM) receive mirror position signals from the mirror horizontal and vertical position sensors. These signals are used by the door modules for memory recall functions of the driver and passenger mirrors. The door modules command the mirror memory settings based upon the voltage level received back from the position sensors. Each door module provides a 5 volt supply, a signal, and ground circuit for each of the position sensors. The horizontal and vertical position sensors are variable resistors that the door modules monitor voltage levels across. When a memory setting is recalled, the door modules command the mirror motors in the appropriate directions until the stored position sensor voltage levels are achieved. The DDM and PDM monitor the signal circuits to determine if the voltage level is out of range.

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 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

5. 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.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.