Rear taillights not working

Hello,

It sounds like the BCM is out and needs to be replaced here are the instructions on how to do so in the diagrams below.

Body Control Module Programming and Setup

A new body control module (BCM) must be programmed with the proper RPO configurations. The BCM stores the information regarding the vehicle options and if the BCM is not properly configured with the correct RPO codes, the BCM will not control all of the features properly. The Tech 2 software will automatically prompt you with the possible RPO's available for the vehicle. Ensure that the following conditions exist and are met in order to prepare for BCM programming:

1. Understand this entire procedure.
2. The battery is fully charged.
3. The ignition switch is in the ON position.
4. The data link connector (DLC) is accessible.
5. All disconnected modules and devices are reconnected before programming.
6. Follow all Scan Tool on screen directions.
7. Take time to verify the VIN on the Scan Tool is correct, failure to do this could result in the service part being made unprogrammable.

BCM Setup

1. To setup a new BCM, navigate to the Module Setup menu in Computer Integrating Systems on the scan tool, select Body Control Module.
2. Run the BCM Setup, BPP Calibration and Program Key Fobs procedures.
3. If the BCM fails to accept the program, perform the following steps:

* Inspect all BCM connections.
* Verify that the scan tool has the latest software version.

Remote Start Programming

The Remote Start option can only be programmed with an SPS terminal and a Scan tool configured in the Pass Thru programming arrangement. Use this arrangement and select Remote Start setup on the SPS terminal once the programming options appear. Choose the appropriate settings when prompted for engaging or disengaging the Remote Start option. Refer to Service Programming System (SPS) (See: Vehicle > Programming and Relearning).

BPP Sensor Calibration

Important: If the BCM, electronic brake control module (EBCM) or the brake apply sensor (BAS) is replaced a brake pedal position (BPP) sensor calibration must be preformed.

Perform the BPP Sensor Calibration using a scan tool if the BCM, EBCM or the brake apply sensing system (BASS) sensor has been replaced.

Using a scan tool preform the following:

1. Navigate to the Module Setup menu in Computer Integrating Systems on the scan tool, select Body Control Module.
2. Select BPP Sensor Calibration.
3. Follow the on-screen directions.

Passkey 3 Programming Procedures

Important: If any module or device listed is replaced, programming of the module must be done prior to performing the Passkey 3 Programming procedure.

Perform the Immobilizer System Component Programming (North America except Canada) (See: Vehicle > Programming and Relearning)Immobilizer System Component Programming (Canada) (See: Vehicle > Programming and Relearning) procedure if any of the following components have been replaced:

* The BCM
* The powertrain control module (PCM)

Refer to Immobilizer System Component Programming (North America except Canada) (See: Vehicle > Programming and Relearning)Immobilizer System Component Programming (Canada) (See: Vehicle > Programming and Relearning)

Important: After programming, 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 happens.

Hello,

I would start by removing the rear taillight sockets and removing the bulbs while looking for a burned connector. Check out this guide which can help walk you through the problem. I have also included the wiring diagrams so you can see how the system works.

https://www.2carpros.com/articles/no-tail-lights-exterior-running-lights-tail-lights-out

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

Hello,

Sorry to hear about your troubles. Can I ask did these problems start right after having the new engine put in? And when you say where the fuses plug into not so good why is that can you upload a picture? The reverse lights do not run through the BCM so it cannot be all of it if it was the problem. Has the car had any water problems like in a flood?

Here are the exterior light wiring diagrams so we can get started and see how the system works. (Below)

Please let us know what you find. We are interested to see what it is.

Cheers, Ken

I am leaning toward the BCM causing all of your problems because most of the things you mention are ties to it.

Here is the location you might be able to get a used one without having to program the unit to the car

Here is its location so you can check it out.

Check out the diagrams (below).

Please let us know what you find.

Cheers, Ken

Hi Christina,

It is good to hear that you have picked up the ball and are running with it. Forty five is not old and if you keep your great attitude no age ever will be. I am running up on fifty seven and I still feel thirteen. Call it immature but I do not mind, I try to see the good side of life and help people the best I can. I found the more I give myself the more unhappy I became. The wise say less is more, they are right. Help people and you will always be happy. That is why we created this site.

Great getting to know you, let us know what happens with the car take care of your husband as I know you do.

Your friend, Ken

Check the light sockets to make sure they are not damaged. Check to make sure the ground to them is good.

Check for bad / melted light sockets that are shorted. Also, check wiring to lights.