For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptors

DTC B1722 01: Mirror Power Fold Circuit Short to Battery
DTC B1722 02: Mirror Power Fold Circuit Short to Ground
DTC B1722 04: Mirror Power Fold Circuit Open

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Folding Mirror Motor Retract Control | B1722 02 | 1 | B1722 01 | --
Folding Mirror Motor Extend Control | B1722 02 | 1 | B1722 01 | --
1. Power Folding Mirror Inoperative

### Circuit/System Description

The driver door module (DDM) and passenger door module (PDM) 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.

### Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

### Conditions for Setting the DTC

An improper voltage level is seen on either the folding mirror motor retract control circuit or the folding mirror motor extend control circuit.

### Action Taken When the DTC Sets

Power folding mirror operations are suspended as long as the fault is present.

### Conditions for Clearing the DTC

• | A current DTC will clear when the fault is no longer present.

• | A history DTC will clear after 40 fault-free ignition cycles.

### Reference Information

#### 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

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool References

Control Module References for scan tool information

### Circuit/System Verification

Ignition ON, using the folding mirror switch, the left and right rearview mirrors should extend and retract as commanded.

### Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the appropriate outside rearview mirror.
2. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2.
3. Command the Mirror Fold to Retract and Extend with a scan tool. The test lamp should turn ON when commanding the retract and extend 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 circuits test normal, replace the door module.

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

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Power Mirror Replacement

• | Control Module References for DDM or PDM replacement, setup, and programming