Power Mirror Folding Inoperative

Power Mirror Folding Inoperative

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The driver door module (DDM) and front passenger door module (FPDM) control the power folding or power extending functions of the outside rearview mirrors. The folding mirror motors are controlled by using bi-directional motor controls through the folding mirror motor retract control circuit and the folding mirror motor extend control circuit.

Circuit/System Verification

1. Ignition ON, observe the scan tool Mirror Folding Operation parameter while cycling the mirror fold switch between the extend and retract positions. The parameter should change between Idle, Extend, and Retract.

^ If the parameter does not cycle between the specified values, replace the DDM.

2. Command the power folding mirrors to extend and retract using the mirror fold switch. Both mirrors should extend and retract as commanded.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector X3 at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground:

* Control circuit terminal B1
* Control circuit terminal A1

^ 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:

* Control circuit terminal B1
* Control circuit terminal A1

^ If less than the specified value, test the appropriate circuit for a short to ground. If the circuits test normal, test or replace the rearview mirror motor

4. Test for 5-15 ohms of resistance between the control circuit terminal B1 and the control circuit terminal A1.

^ 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 motor.

5. If all circuits test normal, replace the appropriate door module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Outside Rearview Mirror Motor Replacement