2010 Cadillac Truck SRX FWD V6-3.0L Page 235

2010 Cadillac Truck SRX FWD V6-3.0L Page 235

Component Testing

1. Ignition OFF, disconnect the harness connectors at the B71 liftgate object sensor.

2. Test for 8k-12k ohm between the signal terminal A and the low reference terminal B.

瀚慖f not within the specified range, replace the B71 liftgate object sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.

* Liftgate Side Upper Sensor Replacement (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Trunk / Liftgate Position

Sensor/Service and Repair/Liftgate Side Upper Sensor Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for liftgate control module replacement, setup and

programming

B154A

DTC B154A or B154B

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions)provides an overview of each diagnostic category.

DTC Descriptors

DTC B154A 39

- Driver Mirror Internal Malfunction

DTC B154B 39

- Passenger Mirror Internal Malfunction

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.