Diagnostic Instructions

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 Verticle Circuit Short to Battery

DTC B1600 02: Mirror Motor Verticle Circuit Short to Ground

DTC B1600 04: Mirror Motor Verticle 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	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Left/Right Mirror Motor Left Control	B1605 02	B1605 04	B1605 01	--
Left/Right Mirror Motor - Up/Right Control	B1544 02	B1544 04	B1544 01	--
Left/Right Mirror Motor Down Control	B1600 02	B1600 04	B1600 01	--

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

Reference Information

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Mirror Connector End Views

Description and Operation

Outside Mirror Description and Operation

Electrical Information Reference

Scan Tool Reference

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.