B1544
DTC B1544, B1600, or B1605
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.
DTC Descriptors
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 Module (DDM) or Passenger Door Module (PDM) 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 vertical control circuit and voltage or ground is supplied through the mirror motor common control circuit.
Horizontal controls operate in the same manner with the mirror motor horizontal control circuit supplying voltage or ground and the mirror motor common control circuit suppling voltage or ground to the mirror horizontal motor when the mirror is commanded right and left.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
B1544
An improper voltage level is detected on the driver/passenger mirror motor common control circuit while the mirror is being commanded.
B1600
An improper voltage level is detected on the driver/passenger mirror motor vertical control circuit while the mirror is being commanded.
B1605
An improper voltage level is detected on the driver/passenger mirror motor horizontal control circuit while the mirror is being commanded.
Action Taken When the DTC Sets
Mirror movement is suspended as 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 fault free ignition cycles.
Reference Information
Schematic Reference
Outside Rearview Mirror Schematics (Outside Rearview Mirror Schematics)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Outside Mirror Description and Operation (Heated Mirrors) (Outside Mirror (Heated Mirrors))Outside Mirror Description and Operation (Power Mirrors) (Outside Mirror (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 References
Control Module References (Control Module References) for scan tool information
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 X3 harness connector at the appropriate door module.
2. Ignition ON, verify a test lamp does not illuminate between the following control circuit terminals and ground:
* Control circuit terminal 1
* Control circuit terminal 2
* Control circuit terminal 6
• 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 1
* Control circuit terminal 2
* Control circuit terminal 6
• If less the specified value, test the appropriate control circuit for a short to ground.
4. Test for 40-100 ohms between the control circuit terminal 1 and the control circuit terminal 6.
• 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.
5. Test for 40-100 ohms between the control circuit terminal 2 and the control circuit terminal 6.
• If not within the specified range, test both control circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
6. If all circuits test normal, replace the 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 PDM replacement, setup, and programming