Odd brake lights on while running and no dummy lights problem. - JeepForum.com
 
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post #1 of 9 Old 01-25-2020, 01:18 AM Thread Starter
haschebrown
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Odd brake lights on while running and no dummy lights problem.

My wife's 2012 grand has the brake lights continuously on but only when running. The key fob will work in all ways except when trying to remote start it. It gets the signal but won't start it. The battery reads 12.6 volts. When in the car It will go thru the accessory then run sequence with no brake pedal depressed but when you hit the push button to go to off setting it will start with no brake pedal being pressed. The traction control light with momentarily come on randomly in non slipping conditions and had the throttle pedal sensor light flash a time or two. I have a fixd ob2 plug in scanner that syncs to the phone but it only show a low battery fob light that immediately turns back on even tho both fobs have brand new batteries. The code says it could cause damage and fail emissions???!!! Just from a fob code? I'm lost here and would greatly appreciate any help and thank you!

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post #2 of 9 Old 01-25-2020, 07:44 AM
ColdCase
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A bad brake switch could cause a bunch of your symptoms. What is the code number?

Does battery read 12.6 all the time, including when the engine is running?

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post #3 of 9 Old 01-25-2020, 08:14 AM
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And the codes you retrieved are...... ?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #4 of 9 Old 01-25-2020, 01:20 PM Thread Starter
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it's 14.6 when running so alternator is good. Here's a pic of the code.

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post #5 of 9 Old 01-25-2020, 01:22 PM Thread Starter
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After clicking on it.

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post #6 of 9 Old 01-25-2020, 05:51 PM Thread Starter
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Quote:
Originally Posted by ColdCase View Post
A bad brake switch could cause a bunch of your symptoms. What is the code number?

Does battery read 12.6 all the time, including when the engine is running?
It is fixed! You were right ColdCase. It was a bad brake switch. I was deterred from thinking that was the problem cause all others that had that issue said they got a check engine light with a brake system error code. I had no engine light and no code anywhere near that. So it may have failed internally in an odd way. I'm gonna take it apart just for the fun of it. Lol thank you for guiding me in that direction!

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post #7 of 9 Old 01-25-2020, 07:27 PM
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There are three switches in the switch housing, one to the TIPM brake circuit, one to the PCM brake circuit, and one to the PCM speed control circuit. Depending on the state of the three, you can get different symptoms.

B1A11 is indeed a low FOB battery, but it doesn't effect emissions. You may have reduced range for remote starting, locking and unlocking type functions, but otherwise the WK2 will work fine. You don't even need a battery in the FOB to start and drive the Jeep.

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post #8 of 9 Old 01-25-2020, 08:50 PM Thread Starter
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I have brand new batteries in both fobs and after switch replacement it has no issue at any range..... very odd. Maybe my cpu is on the spectrum. Lol

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post #9 of 9 Old 01-26-2020, 07:43 PM
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Just as an aside, FIXD is a very basic, consumer grade diagnostic tool that has a reputation for giving wrong information.


There are a multitude of more reliable tools available, but some of the more advanced ones will only give you the code and you have that code up yourself.
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