Power Mirrors Inoperative
Power Mirrors Inoperative
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions)provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The driver door module (DDM) or front passenger door module (FPDM) controls the mirror horizontal and vertical motors through the use of bi-directional motor controls. When the mirror is commanded up, voltage is supplied to the mirror vertical motor through the driver/passenger mirror motor right/down motors common circuit and ground is supplied through the driver/passenger mirror motor down control circuit. When the mirror is commanded down, voltage is supplied to the mirror vertical motor through the driver/passenger mirror motor down control circuit and ground is supplied through the driver/passenger mirror motor right/down motors common circuit.
Horizontal controls operate in the same manner with the driver/passenger mirror motor right/down motors common circuit supplying voltage and the driver/passenger mirror motor right control circuit supply a ground to the mirror horizontal motor when the mirror is commanded right. When the mirror is commanded left, voltage is supplied to the mirror horizontal motor through the driver/passenger mirror motor right control circuit and ground is supplied through the driver/passenger mirror motor right/down motors common circuit.
Reference Information
Schematic Reference
Outside Rearview Mirror Schematics (Outside Rearview Mirror Schematics)
Connector End View Reference
Component Connector End Views (Component Connector End Views)
Description and Operation
Outside Mirror Description and Operation (Heated Mirrors) (Outside Mirror Description and Operation (Heated Mirrors))Outside Mirror Description and Operation (Power Mirrors) (Outside Mirror Description and Operation (Power Mirrors))
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Control Module References)for Scan Tool Information
Circuit/System Verification
1. Ignition ON, observe the scan tool Mirror Select Switch parameter while cycling the mirror select switch between the left and right positions. The parameter should change between Neutral, Left, and Right.
• If the parameter does not cycle between the specified values, replace the DDM.
2. Observe the scan tool Mirror Motor parameter while cycling the mirror directional switch between the up, down, left and right positions. The parameter should change between Idle, Up, Down, Left, and Right.
• If the parameter does not cycle between the specified values, replace the DDM
3. Command the left and right outside mirror to move up, down, left and right using the mirror directional switch. The mirrors should move in the commanded direction.
• If either mirror does not move in all commanded directions, refer to Mirror Motor Circuit Malfunction.
Circuit/System Testing
Mirror Motor Circuit Malfunction
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 supply voltage circuit terminal B7 and ground.
* Control circuit terminal B4
* Control circuit terminal B2
* Control circuit terminal B6
• If the test lamp illuminates, test the appropriate control circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the following control circuits and ground:
* Control circuit terminal B4
* Control circuit terminal B2
* Control circuit terminal B6
• If less the specified value, test the appropriate control circuit for a short to ground.
4. 4. Test for 40-100 ohms of resistance between the control circuit terminal B4 and the control circuit terminal B6.
• 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. Test for 40-100 ohms of resistance between the control circuit terminal B2 and the control circuit terminal B6.
• 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.
6. If all circuits test normal, replace the appropriate door module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Outside Rearview Mirror Motor Replacement (Service and Repair)
* Control Module References (Control Module References)for DDM or FPDM replacement, setup and programming