2010 Cadillac Truck SRX AWD V6-3.0L Page 237
Circuit/System Description
The outside rearview mirror switch is a multiplex switch which signals the left mirror control module which outside rearview mirror to move
(driver or passenger) and which direction to move it. The left mirror control module and the 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 left mirror control module. When
the memory seat module receives the switch inputs from the left mirror control module, mirror output commands are sent to the appropriate switch
through the serial data circuit. The left mirror control module and passenger window switch control the left and right outside rear view mirrors
through bi-directional 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 left mirror control module 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 left mirror control module 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
The left mirror control module has determined that a hardware or software error has occurred.
B154B 39
The passenger window switch has determined that a hardware or software error has occurred.
Action Taken When the DTC Sets
Power mirror functions are 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 (See: Body and Frame/Mirrors/Diagrams/Electrical Diagrams/Outside Rearview Mirror Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Outside Mirror Description and Operation (without AAB) (See: Body and Frame/Mirrors/Description and Operation/Outside Mirror Description
and Operation (without AAB))Outside Mirror Description and Operation (With AAB) (See: Body and Frame/Mirrors/Description and
Operation/Outside Mirror Description and Operation (With AAB))
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
