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My brake light don't work. The fluids? It's been checked.

Customer Question
My brake light don't...

My brake light don't work

Mechanic's Assistant: Have you checked the brake fluid? How's the level and when was it last changed?

The fluids?

Mechanic's Assistant: What is the model/year of your Pontiac?

It's been checked

Mechanic's Assistant: What year is your Pontiac?

2009 g5 base model. The light on the trunk works & the blinkers all work

Mechanic's Assistant: Are you fixing your G5 yourself? What have you tried so far?

I took it in today to get inspected and if failed because the brake lights

Submitted: 2 months ago.Category: Pontiac
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Answered in 2 minutes by:
3/23/2018
Pontiac Mechanic: Dan, Technician replied 2 months ago
Dan
Dan, Technician
Category: Pontiac
Satisfied Customers: 25,953
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
Verified

Hello, my name is ***** ***** I'm here to help get your problem solved.

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Customer reply replied 2 months ago
Hi
Customer reply replied 2 months ago
Texting is fine for now
Pontiac Mechanic: Dan, Technician replied 2 months ago

A​t the drivers side brake light the black wire should have ground and the dark green wire should have power while pressing brake pedal. the brake pedal position sensor sends signal to the body control module and the body control modue sends power to the lights. If good power/ground at connector replace bulbs. If missing power then your body control module has probably failed which is about a $500 repair at dealership. Since the middle brake light works we know the brake sensor is sending proper signal to the body control module. My goal is to provide 5 star service so please let me know if you have any questions, thanks.

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Customer reply replied 2 months ago
It's hard to see because it 10pm
Pontiac Mechanic: Dan, Technician replied 2 months ago

That is fine, you can reply to this answer at any time without additional fees so make sure to let me know how it goes or if you need anything when you get around to testing. Thanks.

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Customer reply replied 2 months ago
What color wire am I looking for?
Pontiac Mechanic: Dan, Technician replied 2 months ago

At the rear drivers side brake light the dark green wire is power and black wire is ground. Let me know if you have questions, thanks.

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Customer reply replied 2 months ago
The right rear has a green wire
Pontiac Mechanic: Dan, Technician replied 2 months ago

Sorry about that, so right rear has green and left rear has yellow. Let me know if you have questions, thanks.

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Customer reply replied 2 months ago
Brown black & green on right side. Yellow brown & black on left
Pontiac Mechanic: Dan, Technician replied 2 months ago

That is correct, I had sides mixed up. So if power/ground are good then inspect connectors and replace bulbs. If missing power then the body control module will need to be replaced. You can disconnect battery for 10 minutes to try and reset module for a possible temporary fix.

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Customer reply replied 2 months ago
Where is this control module?
Pontiac Mechanic: Dan, Technician replied 2 months ago

It is located under the center console. Here is a picture of module and wiring diagram to help with testing. Let me know if you have questions, thanks.

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https://www.dropbox.com/s/6bucpinngc1qp9x/wd.pdf?dl=0

-

https://www.dropbox.com/s/dsclzoke0z7vsz9/bcml.pdf?dl=0

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Customer reply replied 2 months ago
What if the blinkers work?
Customer reply replied 2 months ago
Dan
Pontiac Mechanic: Dan, Technician replied 2 months ago

That would leave body control module as only possible cause proving wiring and bulbs are good. Let me know if you have questions, thanks.

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Customer reply replied 2 months ago
How much would that cost me? If I replaced it myself? Vs taking it to get done?
Pontiac Mechanic: Dan, Technician replied 2 months ago

T​he dealership needs to reprogram it to vin so they will need to install but you can buy part yourself to save a couple hundred. Give me a few minutes to pull up info to buy yourself.

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Pontiac Mechanic: Dan, Technician replied 2 months ago

The part number is *****​ and they will charge around $100 to install/program. Let me know if you have more questions, please do not forget to rate answer. Thanks.

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https://www.ebay.com/itm/BRAND-NEW-OE-Original-Body-Control-Module-ACDelco-GM-25928052-in-Original-Box/273104330293?epid=708246181&hash=item3f96495e35:g:twAAAOSwM79apDh4&vxp=mtr

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Customer reply replied 2 months ago
I saw it for like 165. How much would it cost to program it
Customer reply replied 2 months ago
Awesome. Thanks. I'll keep in touch if I need anything else
Pontiac Mechanic: Dan, Technician replied 2 months ago

It is about $100 for them to install/program it. The link I sent you above is $125 and they would probably accept a $100 offer.

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Pontiac Mechanic: Dan, Technician replied 2 months ago

Sounds good, I'll be here if you need me. Thanks again and have a great night.

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Customer reply replied 2 months ago
Well I just double checked. The rear blinkers don't work
Pontiac Mechanic: Dan, Technician replied 2 months ago

Body control module is still the most likely cause but you would want to check for power/ground at bulbs first if good replace bulbs. If missing power then verify wiring is good between body control module and bulbs, if wiring is good then replace body control module. Let me know if you have questions, thanks.

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Customer reply replied 2 months ago
Ok
Customer reply replied 2 months ago
Most auto part stores can check voltage for me?
Pontiac Mechanic: Dan, Technician replied 2 months ago

No auto parts store will check voltage, you will need to buy test light or multimeter to do the testing yourself.

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Pontiac Mechanic: Dan, Technician replied 2 months ago

You could just replace a bulb to see if it helps if not then it would be a pretty safe assumption that the body control module has failed.

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Customer reply replied 2 months ago
Ok. Thanks
Pontiac Mechanic: Dan, Technician replied 2 months ago

No problem, keep me updated. Please do not forget to rate answer, thanks.

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Pontiac Mechanic: Dan, Technician replied 2 months ago

Ever get it figured out? Please do not forget to rate answer. Thanks.

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