Stumped: Reverse Lights Stay On - Ford Mustang Forum
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post #1 of 12 (permalink) Old 05-05-2018 Thread Starter
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Stumped: Reverse Lights Stay On *UPDATE*

I'm having a problem with my 2011 3.7 MT Mustang that I'm hoping you guys can give me a hand with.

My reverse / backup lights stay on no matter what the condition. Forward gear even with the key out of the ignition they remain on. My first thought was reverse switch on the transmission, disconnected it but no change the lights stay on. The only way I can get them to turn off is to disconnect the battery. As soon as you reconnect it they come back on.

I checked all the other external lights, they all function normally. I have done a ton of searching online and can't find much of anything that is similar to this situation.

Any ideas?


2011 V6 Mustang
6 Speed Manual - 3.31 Gears
Kona Blue, Pony Package

Last edited by adblink; 05-06-2018 at 01:50 PM.
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post #2 of 12 (permalink) Old 05-05-2018
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Get the schematics for the system and walk through it until you find the problem, or take it to an auto electric specialty shop and let them do it for you.

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post #3 of 12 (permalink) Old 05-05-2018
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Stumped: Reverse Lights Stay On

What’s been done to the car? Does it have brake light sequencers? This is something that just started happening? Sounds very odd that they would stay on.

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post #4 of 12 (permalink) Old 05-06-2018
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Do what other have said. My 'guess' is a part called, Switch assy- Reversing lamp.



https://parts.ford.com/shop/en/us/sw...lamp-6364449-1

'Little Red'. 2011 V-6 Mustang. Automatic <acronym title="transmission">Trans</acronym>. C&L C.A.I. Ceramic Coated BBK Long Tube Headers and Catted Shorty X-Pipe. Magnaflow Street Series Axle Backs. 3.73 rear gears. GT 500 Lower Control Arms. JLT Catch Can. Axle Exchange Aluminum Drive Shaft. Steeda Watts Link. Several more mods...1991 F150 4X4 61,000 miles. Wifes car, 2014 Ford Edge Limited.
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post #5 of 12 (permalink) Old 05-06-2018 Thread Starter
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The part that pisses me off the most is that the car was hibernating in my attached garage the whole winter. Didn't have this problem when I parked it. I have no evidence of animals of any kind in my garage so I'm fairly certain it's not mice or anything.

The car does have sequential tail lights that came from the factory.

2011 V6 Mustang
6 Speed Manual - 3.31 Gears
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post #6 of 12 (permalink) Old 05-06-2018 Thread Starter
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Quote:
Originally Posted by David Young View Post
Do what other have said. My 'guess' is a part called, Switch assy- Reversing lamp.



https://parts.ford.com/shop/en/us/sw...lamp-6364449-1

Is that the switch that I already have disconnected on the transmission?

2011 V6 Mustang
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post #7 of 12 (permalink) Old 05-06-2018
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here is a link to prints....you said lights if it was only one I would be looking for water in the housing. Both you have some digging to do. Good luck

https://www.allfordmustangs.com/forum...ce-manual.html

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post #8 of 12 (permalink) Old 05-06-2018
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Does it have the stock bulbs in it or did you replace them with LED's. On my 2010 the cheap LED's would stay lit all the time in the back up lights and dome lights so I put the stock bulbs back in.
Ford Workshop Service & Repair Manuals - 2011 Mustang 2011 Mustang 093 - reversing lamps

http://i124.photobucket.com/albums/p34/Siberexpress/Sterling/Stripes/af58edf0-2e2e-4ffe-a201-405b00a627bc_zpseb5ae052.jpg
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post #9 of 12 (permalink) Old 05-06-2018 Thread Starter
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Quote:
Originally Posted by Siber Express View Post
Does it have the stock bulbs in it or did you replace them with LED's. On my 2010 the cheap LED's would stay lit all the time in the back up lights and dome lights so I put the stock bulbs back in.
Ford Workshop Service & Repair Manuals - 2011 Mustang 2011 Mustang 093 - reversing lamps
stock lights. No modifications to the lighting system at all.
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post #10 of 12 (permalink) Old 05-06-2018 Thread Starter
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UPDATE ** (all of this testing was done with key off, forward gear and reverse switch on the transmission disconnected)

Looking at the prints Ford Workshop Service & Repair Manuals - 2011 Mustang 2011 Mustang 093 - reversing lamps (Thanks Siber Express). It shows the 2 wires coming out of the "body module b" going to the L & R reverse lights. I located the module and disconnected the larger black connector, the reverse lights turn off.

I manually powered the body control module only without the connector by running a jumper from the connector battery (-/+) to the body control module. Using a test light I found that the only 2 pins that had power still in this condition were the 2 pins for the L & R reverse tail lights. According to the drawings the (+) is always hot, and it doesn't mention the (-) so I'm assuming that isn't switch. To me it sounds like that module is the problem? Internal short that is sending power to those 2 pins all the time?



2011 V6 Mustang
6 Speed Manual - 3.31 Gears
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post #11 of 12 (permalink) Old 05-11-2018 Thread Starter
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Haven't made any progress, and despite lots of cross posting online can't find anyone who has experienced this.

Doing something I didn't think I'd ever have to. Taking it to the dealer this Wednesday. &#x1f61e;

2011 V6 Mustang
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Hi

In nearly all cases when lights stay ON even ignition is OFF, there is a defect Transistor in in the SJB, body module etc.
The Transistor mostly is a "smart" highside switch with up to 6 pins. When you have located the pins on the SJB etc., you can follow the conducting path to locate it.
For replacement look for the datasheet ( transistor ) and find a compatible ( stronger ) type ( mostly marked with BTS XXX ).


Sorry for my german english
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