Dash lights stay on

FRANK THOMPSON

MEMBER
2011 CADILLAC DEVILLE DTS
2.5L
V8
2WD
AUTOMATIC
145,000 MILES

Car was parked in drive way and alarm sounded for no apparent reason and after a little while the alarm stopped. I can start car and drive it, the remote fob works, the problem now is the back lighting on control knobs, steering wheel and clock stay on, the clock on radio will not set, all other features on car seem to work okay. The back lighting creates a very low drain on battery. I have worked on car problems for many years but this car problem is working on me. Help!

2 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,256 POSTS

Hello,

This is common when the BCM of the car goes out. To be sure we can do a CAN scan to confirm the issue. here is a video to help us with the BCM replacement instructions in the diagrams below in case it does need to be replaced:

https://youtu.be/InIlnsjOVFA

Body Control Module Programming and Setup

Introduction

A new body control module (BCM) must be programmed with the latest operating software and vehicle calibrations. Ensure that the following conditions exist in order to prepare for BCM programming:

* The battery is fully charged.
* The ignition switch is in the ON position.
* The data link connector (DLC) is accessible.
* All modules and devices are connected.

The procedures below are designed to program the body control module (BCM) correctly during BCM related service. Before you start, read these procedures carefully and completely.

Programming the BCM

Important: The vehicle will not start and many other functions may not operate properly if a replacement BCM is not properly set up. The following procedures must be completed:

Important: After the procedure is completed, the personalization settings of the BCM are set to default settings. Inform the customer that the personalization must be set again.

1. Programming the BCM-From the Main Menu, select Service Programming System, then follow the instructions on the screen. Refer to Service Programming System (SPS) (See: Vehicle > Programming and Relearning > Service Programming System (SPS)) for more information.
2. BPP Sensor calibration-Refer to Brake Pedal Position Sensor Calibration ().
3. Learning the restraints ID-Navigate on the Tech 2 to Vehicle Control Systems ] Module Setup ] Body Control Module ] Setup SDM Primary Key in BCM, then follow the instructions on the screen.

Important: After any programming or setup, perform the following to avoid future misdiagnosis:

1. Turn the ignition OFF for 10 seconds.
2. Connect the scan tool to the data link connector.
3. Turn the ignition ON, with the engine OFF.
4. Use the scan tool in order to retrieve history DTCs from all modules.
5. Clear all history DTCs.

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Images (Click to make bigger)