Hello and welcome to just answer. Let me see if I can help you with this. I have seen the ABS control module cause something like this. Try disconnecting the ABS control module electrical connector and then see if the brake lights will now turn off. If so, replace the ABS control module.
Can you tell me where this is located.
Thank you, Christopher
Yes. It is located at the left rear area of the engine compartment near the master cylinder and left hood hinge.
This had no affect. However I can disconnect the negitive battery cable now and they will stay off when reconnected until the brake is applied again.
Hmm, ok, try disconnecting the PCM (engine computer) which is mounted on the right side of the fire wall. Let me know.
Ok thank you. I did replace the TIPM but not the FCM. Sorry for any confusion.
Oh, ok you replaced the IPM (Integrated Power Module) Tipm's were not used until 2006. You have the FCM mounted to the IPM. The electronics are in the FCM. Does the third brake light turn off, or does it stay on also?
Let me look at some diagrams. I will be right back.
Ok, Thnak you
Ok Christopher, I see that the 3rd brake light is wired directly to the brake switch and does not go through the TIPM. Disconnect the brake light switch and let me know if the lights turn off.
I disconnect the brake switch and the lights stay on.
Ok, this is weird, but I do see that in some build configurations, the instrument cluster is wired into the brake light switch circuit also. So knowing that, we need to disconnect the truck's instrument cluster connector next. If you need the procedure for pulling the cluster out so you can disconnect it let me know and I will send it to you.
Chris, I will need the procedure for pulling the cluster.
Ok, give me a few minutes to gather that and I will get back to you.
Thank you for all your help. With the cluster being in question, could that be a reason the cruise control quit working? Just thought of this when the cluster was in question.
Hmm, maybe. You are welcome, and here is the procedure for you. I hope this helps, and is the problem.
Using a trim stick C-4755 or equivalent, release the top clips on the steering column opening cover and the lower drivers side bezel. Using a trim stick C-4755 or equivalent, release the head light switch switch bezel.Disconnect the electrical connector and remove the bezel.
Remove the two lower screws from the STEERING COLUMN OPENING COVER Using a trim stick C-4755 or equivalent, release the upper clips and remove the cover.
Disconnect and isolate the negative battery cable. Remove the steering column opening cover. Open the ashtray and cup holder. Remove the one center bezel retaining screwUsing a trim stick C-4755 or equivalent, gently pry the center bezel free from the instrument panel. Working behind the center bezel, disconnect all electrical connectors and remove the bezel.
Remove the cluster bezel from the instrument panel
Remove the four screws that secure the instrument cluster to the instrument panel structural support. Pull the instrument cluster rearward far enough to access and disconnect the instrument panel wire harness connectors for the cluster from the connector receptacles on the back of the cluster housing. Remove the instrument cluster from the instrument panel.
Lets say the cluster is the problem. Replacement of the cluster itself would fix it or is there other modules or switches as well.
You have been a great help and informative. Thank you
That is great news my friend! You are welcome.