2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 645
* 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
Ignition ON, observe the scan tool BCM Central Door Lock Switch on Console parameter. The reading should be Inactive and change to Lock and
Unlock when pushing the appropriate switch.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the A20 radio/HVAC control.
2. Ignition ON, verify the scan tool Central Door Lock Switch on Center Console parameter is Inactive.
瀚慖f the value is Lock , test the signal circuit terminal 12 for a short to ground. If the circuit tests normal, replace the K9 BCM.
瀚慖f the value is Unlock , test the signal circuit terminal 13 for a short to ground. If the circuit tests normal, replace the K9 BCM.
3. If all circuits test normal, replace the A20 radio/HVAC control.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM and HVAC control replacement, setup and
programming
B3155
DTC B3155
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 Descriptor
DTC B3155 00
- Passenger Exterior Lock Sensor Malfunction
Diagnostic Fault Information
Circuit/System Description
The exterior passenger door handle contains a small sensor which allows a person to lock the vehicle doors from the outside without using the
remote keyless transmitter. The keyless entry control module monitors the voltage level on the passenger door handle switch signal circuit, when
the switch is pressed, the voltage in the signal circuit will drop and the keyless entry control module will then send a serial data message to the
BCM to command all the doors to lock.
Conditions for Running the DTC
Battery voltage is between 9-16 V.
Conditions for Setting the DTC
