Have Ford Questions? Ask a Mechanic for Answers ASAP
Hello and welcome! My name isCustomerand I can assist you with your question.
I have been in the auto repair business for many years and specialize in diagnosing vehicles with problems like this one you are describing. I am confident we can resolve your problem together provided you stick with me and run the necessary tests. Please understand that I don't know your skill level and that I can't see, smell, hear, or touch the vehicle either, so it may take a few replies to get to satisfactory results. I am also going to do my best to direct you with the fastest, easiest and most common things to check first to make this as simple as possibly for both of us. I just ask that you provide me with the all of the correct information up front and with the most accurate tests results as we move on so that I can point you in the right direction. I would also appreciate a positive rating from you in return for sharing my time and knowledge and expeirence with you in a timely mannner. Even if you rate my answer after the first few replies, we can still continue our conversation at no further cost to you. With that being said, lets get started.
Can I start by getting your VIN? Thank you!
Thank you for that information. NO problem. I understand where your coming from. Do you need a wiring diagram for this circuit?
Will do! Just so I make sure I get the correct wiring diagram for you, I want to be clear what we are going after. The drivers brake light is not working correct? Also the rear drivers turn signal is not working correct?
Thank you. One minute.
This problem is caused by one of three things. A bad Body control module (as it controls power to these lights), a wiring issue to this circuit or a code or codes stored in the BCM. Before replacing or spending time testing, I would first check for codes in the Body control module and or by clearing the memory in the body control module. If there are any stored codes, the BCM may not power up this circuit going to the left rear. So either disconnect the battery for about 10 minutes and or use a scan tool to clear codes in the BCM and go from there.
If the problem remains after clearing the codes, check the wiring and replace the BCM as needed.
Here is a wiring diagram for this circuit. It is spread over two pages.
If you have not had the vehicle plugged into with a full blown scan tool or if the battery has not been disconnected, then the BCM has not been cleared. It will need a more expensive scan tool to read the BCM. A cheap pocket scanner or code reader will not do the trick.
Checking to see if the lights work after disconnecting the battery or by checking to see if there are any codes in the BCM after clearing them
Then i would just clear the codes by disconnecting the battery and checking to see if the lights work.
Sounds good.. no problem. I will be looking forward to your reply.
Ok, then I would rule out a wiring issue to the left rear as your next step and then possibly replace the BCM if needed.
I am glad I can help!
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Please let me know if you have any further questions.
The BCM is failry expensive. I cannot look up the price for the part without the VIN number. YES, there is some labor and programming once it is installed.