Power Mirrors - Memory Functions Inoperative
Power Mirrors - Memory Functions 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.
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.
Circuit/System Verification
Observe the scan tool Mirror Horizontal Position and Mirror Vertical Position parameters. The reading should be between 0.2 volts and 4.8 volts and change as the mirror is moved, left, right, up, and down.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector X3 at the appropriate door switch.
2. Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground:
* 5-volt reference circuit terminal A2
* Signal circuit terminal A5
* Signal circuit terminal A6
* Low reference circuit terminal A4
^ 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:
* 5-volt reference circuit terminal A2
* Signal circuit terminal A5
* Signal circuit terminal A6
* Low reference circuit terminal A4
^ If less than the specified value, test the appropriate circuit for a short to ground.
4. Test for 4K-7K ohms of resistance between the 5-volt reference circuit terminal A2 and the low reference circuit terminal A4.
^ If not within the specified range, test the 5-volt reference circuit and the low reference circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror motor.
5. Test for 1K-7K ohms of resistance between the 5-volt reference circuit terminal A2 and the signal circuit terminal A5.
^ If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror motor.
6. Test for 1K-7K ohms of resistance between the 5-volt reference circuit terminal A2 and the signal circuit terminal A6.
^ If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror motor.
7. 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