DIAGNOSTIC CODE INDEX
Diagnostic Instructions
DTC Descriptor
DTC B154A 39
Driver Mirror Internal Malfunction
DTC B154B 39
Passenger Mirror Internal Malfunction
Circuit/System Description
The outside mirror switch and passenger window switch are on a serial data circuit with the memory seat module as the master. The mirror select and directional control switches are inputs to the memory seat module through the serial data circuit. When the memory seat module receives switch inputs from the outside mirror switch, mirror output commands are sent to the appropriate switch through the serial data circuit. The outside mirror switch and passenger window switch control the left and right outside rear view mirrors through bidirectional motor control circuits. The motor control circuits are floating while in an inactive state and the switches will apply power and ground to the control circuits as necessary to move the mirror in the commanded direction.
Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The outside mirror switch and passenger window switch supply a 5 V reference, low reference, and horizontal and vertical position signal circuits to these sensors. The signal circuits are referenced from 5 V by the switches and the signal circuit voltage levels represent the mirror positions. The mirror positions are sent to the memory seat module through the serial data circuit where they are stored for memory mirror operation. When the memory seat module receives a memory recall command, the memory seat module will send the go to position commands to the outside mirror switch and passenger window switch. The switches will then drive the appropriate mirror motors to the commanded position sensor settings.
Conditions for Running the DTC
Battery voltage must be between 9-16 V.
Conditions for Setting the DTC
B154A 39
An internal malfunction has been detected by the outside rearview mirror switch while commanding the driver outside rearview mirror UP, DOWN, LEFT or RIGHT.
B154B 39
An internal malfunction has been detected by the passenger window switch while commanding the passenger outside rearview mirror UP, DOWN, LEFT or RIGHT.
Action Taken When the DTC Sets
The affected outside rearview mirror will be inoperative.
Conditions for Clearing the DTC
B154A 39
The driver outside rearview mirror must be replaced before the DTC can be cleared.
B154B 39
The passenger outside rearview mirror must be replaced before the DTC can be cleared.
Reference Information
Schematic Reference
Outside Rearview Mirror Schematics (Encore), Outside Rearview Mirror Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Outside Mirror Description and Operation (DG6/DL6 or DI7), Outside Mirror Description and Operation (AAG)
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Replace the M77D Outside Rearview Mirror Motor-Driver.
Replace the M77P Outside Rearview Mirror Motor-Passenger.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Outside Rearview Mirror Inner Actuator Replacement .
SYMPTOMS - MIRRORS
NOTE: The following steps must be completed before using the symptom tables.
Visual/Physical Inspection
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom: