B1605
DTC B1544, B1600, or B1605
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 B1544 01
- Mirror Motors Common Circuit Short to Battery
DTC B1544 02
- Mirror Motors Common Circuit Short to Ground
DTC B1544 04
- Mirror Motors Common Circuit Open
DTC B1600 01
- Mirror Motor Vertical Circuit Short to Battery
DTC B1600 02
- Mirror Motor Vertical Circuit Short to Ground
DTC B1600 04
- Mirror Motor Vertical Circuit Open
DTC B1605 01
- Mirror Motor Horizontal Circuit Short to Battery
DTC B1605 02
- Mirror Motor Horizontal Circuit Short to Ground
DTC B1605 04
- Mirror Motor Horizontal Circuit Open
Diagnostic Fault Information
Circuit/System Description
The Driver Door Switch (DDS) or Passenger Door Switch (PDS) controls the mirror horizontal and vertical motors through the use of bi-directional motor controls. When the mirror is commanded up and down, voltage or ground is supplied to the mirror vertical motor through the mirror motor up/down control circuit and voltage or ground is supplied through the mirror motor common circuit.
Horizontal controls operate in the same manner with the mirror motor left/right control circuit supplying voltage or ground and the mirror motor common circuit suppling voltage or ground to the mirror horizontal motor when the mirror is commanded right and left.
Conditions for Running the DTC
The power mirror is being commanded left, right, up, or down.
Conditions for Setting the DTC
B1544
An improper voltage level is detected on the mirror motor common control circuit while the mirror is being commanded.
B1600
An improper voltage level is detected on the mirror motor up/down control circuit while the mirror is being commanded.
B1605
An improper voltage level is detected on the mirror motor left/right control circuit while the mirror is being commanded.
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 X1 (RPO DS3) or X2 (RPO DNP) harness connector at the outside rearview mirror.
2. Install a test lamp between the control circuit terminal 2 and the control circuit terminal 6.
3. Ignition ON, commanded the mirror left and right using the mirror directional switch. The test lamp should turn ON and OFF as the mirror commanded to the left and right.
^ If the test lamp does not turn ON and OFF when cycling between the commanded states, test both control circuit for a short to voltage, a short to ground, or an open/high resistance. If the circuits test normal, replace the applicable door switch.
4. Ignition OFF, install a test lamp between the control circuit terminal 1 and the control circuit terminal 6.
5. Ignition ON, commanded the mirror up and down using the mirror directional switch. The test lamp should turn ON and OFF as the mirror commanded up and down.
^ If the test lamp does not turn ON and OFF when cycling between the commanded states, test both control circuit for a short to voltage, a short to ground, or an open/high resistance. If the circuits test normal, replace the applicable door switch.
6. If all circuits test normal, test or replace the outside rearview mirror motor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Outside Rearview Mirror Motor Replacement