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Wierd instrument lights, help! :D

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Old 07-15-2013, 06:13 PM   #1
dlazrael
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Default Wierd instrument lights, help! :D

So I drove from my house to crapplebees for lunch, after parking, I noticed my TCS on/off button was illuminated in the off position (which I normally do anyway)
The "TCS Active" light on the dash was on, and the parking brake indicator was on. I've since jacked the car up, rotated all the tired by hand, no brake drag, the brake fluid resevoir is full to appropriate capacity, no leaking fluid noted anywhere, when driving no audible brake grabbing heard. Car still rolls on slight hills in neutral with no issues, parking brake was full disengaged... so I'm at a loss.

Any suggestions or ideas?
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Old 07-15-2013, 06:19 PM   #2
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I'll take stabs at either a brake pad issue, a wheel sensor issue, wheel size mismatch or a wet SJB.
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Old 07-15-2013, 06:56 PM   #3
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Front rotors/pads are new, but have over 600 miles allready, so I would assume that any issue from that would have presented allready; wheel size is 19in GT/CS ('11) rims, but again, they've been on the car for > 1k miles (not sure what the "size" is on the SCT to adjust it if needbe), could be the sensor went bad... and whats SJB? I DID just was the car off cause a bird strafed me...
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2008 Ford Mustang GT:
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Old 07-15-2013, 08:24 PM   #4
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The SJB is the Smart Junction Box--the fuse box and electrical circuitry located behind the access door on the passenger side's kick panel. Check to see if the carpet is wet in that area. You may need to lift the carpet to do a thorough inspection.
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Old 07-16-2013, 01:36 AM   #5
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Hmm, that would be the infamous leak isnt it?
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Go Fast Parts: 2.3L W140AX FRPP Whipple 550 HO Supercharger, PCV Delete, Pypes Violators Axleback, MAC Prochamber, FRPP 62mm Polished TB
Suspension: Steeda: Front/Rear Sways, Sport Springs, Pro-Action S/S, Chromoly LCA, Chromoly UCA, GT500 Strut Mounts
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Old 07-16-2013, 03:33 PM   #6
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Quote:
Originally Posted by dlazrael View Post
Hmm, that would be the infamous leak isnt it?
Yes, unfortunately. But you should rule it out before further troubleshooting.
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Old 07-17-2013, 04:39 PM   #7
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Yea, when I wrote this I was allready in the house for the night, the next morning (0445 to be exact) I drove the car to work, no lights no issues. It may have been something to do with the 3 days of near 100% humidity plus washing the car that did something, though due to my job I havent been able to look in the car for anything and its now been 2 days almost with no rain. So I'll have to check that.... Would there be any signs of corrosion with electrical connectors I should be looking for? Thanks again for helping, this particulay combination of lights isn't listed in Hanes or the service manual
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Go Fast Parts: 2.3L W140AX FRPP Whipple 550 HO Supercharger, PCV Delete, Pypes Violators Axleback, MAC Prochamber, FRPP 62mm Polished TB
Suspension: Steeda: Front/Rear Sways, Sport Springs, Pro-Action S/S, Chromoly LCA, Chromoly UCA, GT500 Strut Mounts
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Old 07-17-2013, 04:49 PM   #8
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Here's the manual with wiring diagrams that should also apply to your '08: http://iihs.net/fsm/?dir=1
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Old 07-18-2013, 05:40 PM   #9
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Thanks for the link, I'll definately bookmark that...

so it gets wierder, now it's dry out, no evidence of dampness/water leakage in the car on the carpet, the SJB is dry, no corrosion... the lights came on again, then turned off while driving, then turned on again on a return trip... so how do i start checking the sensors?

Would the CPU programming matter? I went from factory 17s(w/245/55/17) to '11 GT/CS 19s (275/35/19) but not sure where to find the "revs per mile" for the SCT tuner...
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2008 Ford Mustang GT:
Go Fast Parts: 2.3L W140AX FRPP Whipple 550 HO Supercharger, PCV Delete, Pypes Violators Axleback, MAC Prochamber, FRPP 62mm Polished TB
Suspension: Steeda: Front/Rear Sways, Sport Springs, Pro-Action S/S, Chromoly LCA, Chromoly UCA, GT500 Strut Mounts
Driveline:Steeda Tri-Ax, DSS 4" Aluminum DS
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Old 07-18-2013, 11:43 PM   #10
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Quote:
Originally Posted by dlazrael View Post
I went from factory 17s(w/245/55/17) to '11 GT/CS 19s (275/35/19) but not sure where to find the "revs per mile" for the SCT tuner...
Tire Rack shows revs per mile for each tire it sells under "specs." I looked up a couple of tires in size 275/35/19, and one was 784 and the other was 783.
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Old 07-19-2013, 12:06 AM   #11
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How old is your battery? Mustangs are notorious for acting like they are demon possessed when the battery gets ready to drop dead.

Anyplace that sells batteries can check it free for you. Let us know what the issue turns out to be.

Might want to get the alternator tested at the same time also.
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Old 07-19-2013, 06:43 AM   #12
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Baffling. If the charging system and SJB are ruled out, I think I'd start troubleshooting by having something in the car tied into the rear light circuit (buzzer, lamp) so I could have indication of when the lights erroneously came on and to see if there was any action on my part that would prompt them such as clutch pedal motion, shifter motion, etc.. I suppose I'd be looking for an intermittent short circuit.
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Old 07-19-2013, 10:09 AM   #13
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Take it to someone (probably dealer) that can pull codes for the ABS system. The PCM and ABS and RCM (restraint control module) work toegether for your traction control. Without pulling codes you are just hunting in the dark. You most likely have an intermittent sensor fault.
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Old 07-20-2013, 10:58 AM   #14
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I agree with White05GT, check the battery. Check the voltage regulator too. Sorry you are having electrical issues, but at least I know mine isn't the only one with an annoying gremlin.
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Old 10-14-2013, 11:46 AM   #15
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Thanks for the link, Nuke. Great to have on hand.
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Old 10-14-2013, 01:26 PM   #16
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Thanks for the link, Nuke. Great to have on hand.
Me or the link?

NP. We're all here to help one another.
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Old 10-14-2013, 01:26 PM
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