B1724
DTC B1724
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.
DTC Descriptor
DTC B1724
- Mirror Motor Control Circuit 2 Malfunction
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.
Conditions for Running the DTC
The power mirror is being commanded left, right, up, or down.
Conditions for Setting the DTC
* If the mirror motor up/left control circuit is shorted to battery voltage and the mirror is commanded down or right.
* If the mirror motor up/left control circuit is shorted to ground and the mirror is commanded up or left.
Action Taken When the DTC Sets
Mirror movement is suspended so 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 malfunction-free ignition cycles.
Circuit/System Verification
Command the left and right outside mirror to move up, down, left and right using the mirror directional switch. The mirror should move in the commanded direction.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector X3 at the DDM.
2. Ignition ON, verify a test lamp does not illuminate between the following control circuit terminals 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. 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 DDM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Outside Rearview Mirror Motor Replacement