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 Control Circuit Short to BatteryDTC B1722 02: Mirror Power Fold Control Circuit Short to Ground
DTC B1722 04: Mirror Power Fold Control 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
This feature allows the operator to simultaneously retract both mirrors to a fully folded position. The driver door module (DDM) contains the power folding mirrors switch and, each mirror contains an additional power folding mirror motor. The DDM sends a GMLAN serial data message to the passenger door module (PDM) when the power folding mirror switch is activated to the retract or extend positions. When the power folding switch is activated to the fold position, the DDM and PDM respond by applying battery voltage and ground to there respective power folding mirror control circuits in order to retract the mirrors. When the switch is activated to unfold the mirrors, the DDM and PDM reverse the polarity of the voltage and ground applied to the motors in order to move both mirrors to the fully extended position.
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.
Actions Taken When the DTC Sets
The power folding mirror function will be disabled.
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
Description and Operation
Outside Mirror Description and Operation
Electrical Information Reference
Scan Tool Reference
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
Driver
- Ignition OFF, disconnect the X1 harness connector at the outside rearview mirror.
- Connect a test lamp between control circuit terminal 1 and control circuit terminal 2.
- 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 all circuits test normal, test or replace the outside rearview mirror.
| ⇒ | 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 DDM. |
Passenger
- Ignition OFF, disconnect the harness connector at the outside rearview mirror.
- Connect a test lamp between control circuit terminal 4 and control circuit terminal 5.
- 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 all circuits test normal, test or replace the outside rearview mirror.
| ⇒ | 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 PDM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for DDM or PDM replacement, setup, and programming |
