abs light and traction off light are on - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-28-2004, 04:35 AM   #1
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Default abs light and traction off light are on

i had several previous problems with my 95 bonneville ssei that were solved when the computer was replaced. however, the abs light is on and the traction off light is on as well. does anyone know the procedure in which to fix this? when the lights are on, that means they aren't working, right? my father replaced the computer, and is a car expert, but even he doesn't know why the lights are still on. can anyone help?
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Old 09-28-2004, 04:46 AM   #2
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I can answer the fact, because the lights are on, this means the ABS and Traction Control systems are mal-functioning, and chances are, aren't working at all. Other than that, I don't know if your EBCM [electronic brake control module] is related to the Traction Control system, but my guess it is, since they both will interface with the WSS [wheel speed sensors]. A 92-95 Guru will chime in and hopefully help a little more than I can.


-justin
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Old 09-28-2004, 06:26 AM   #3
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i durrently have the same problem, its my front left sensor, i havent bothered to fix it yet because i dont find the ABS and TCS necessary, i will get it fixed come midfall b4 the snow and ice tho
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Old 09-28-2004, 07:49 AM   #4
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Because you have the hybrid ECU, you can't scan for ABS codes yourself. Sucks to be you, doesn't it? Maybe someone with a '95 FSM can go into the ABS section and there may be a homemade way to extract the codes.


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Old 09-28-2004, 11:46 AM   #5
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my lights are on also u might have somethin groundin out the abs have u check yet?
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Old 09-28-2004, 12:13 PM   #6
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You most likely will need new speed sensors, which are incorporated into the hubs. Check out the wires going into them first, to make sure they're not disconnected.
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Old 09-28-2004, 04:10 PM   #7
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Quote:
Originally Posted by BonneMeMN
You most likely will need new speed sensors, which are incorporated into the hubs. Check out the wires going into them first, to make sure they're not disconnected.
As mentioned, check where the ABS sensor wires connect to the wheel hub. If the wire is severed then it will set an SES code and your ABS/TCS will not be functional.

Jack your car up, support it properly and remove a front wheel. Look behind the brake disk, toward the back of the car, and find the ABS connector and follow the wires into the center of the hub just beside the CV boot on your half shaft.

If the wire is severed in most cases it can be soldered together and you'll be good to go. If not you'll need to replace the entire hub/bearing/ABS assembly. If you need to solder the wire, clean it first with a steel brush, slide a piece of heat shrink over one end of the wire (you'll use this to seal the wires after), you can use copper pipe flux to clean the wires for soldering.

Hope this helps...

Cheers,
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Old 09-28-2004, 04:25 PM   #8
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Check your brake fluid level in the master cylinder reservoir. If it'* low, the ABS and Traction Off lights will illuminate, because there is not enough reserve fluid to circulate if the pump goes on. (Mine will turn on the warning even before it gets down to the Add mark.)

If the fluid is properly up to the Full mark, then your problem is elsewhere.
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Old 09-28-2004, 04:45 PM   #9
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also visually inspect the wires going wherever they go. Make sure they aren't frayed, cut, burned, etc.. Repair as necessary of course .


-justin
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Old 09-28-2004, 04:51 PM   #10
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We need to clarify some points here:

1. Hybrid 94/95 PCM'* mean nothing here. The ABS/TC don't report codes to the PCM. They must be read by a special serial reader. The dealer has the reader. It'll be a minimum of $80 just to diagnose. From 1992-1995 there was no communication between the EBCM(92/93) or the EBCTM(94/95) and the PCM. None whatsoever.

2. I have yet to see a single EBCM or EBTCM fail. Good thing, they're very expensive.

3. Not only can your master brake reservior cause these systems to dump, but there'* also an additional reservior on the PMV assembly that has a level sensor built into it. This is fed from the master reservior. Follow the line down to it.

4. Wheel speed sensors are common culprits, but so is the PMV assembly. That'* not a fun job. There are small solonoids in the PMV that are prone to failure in older cars. PMV'* can run near $1000 installed by a dealer. Cheaper if you do the work yourself. Last time I checked, they were $600 new and $250 from the wrecker.

5. Sometimes a damaged wire or corroded connector at a WSS will be your problem. It'* best to start there and inspect all 4 corners, remove, clean, and reinstall each connector.

6. To replace the WSS, you must replace the entire hub/bearing assembly. In 90% of the cases, these problems are either one or more WSS, or the PMV assembly. The good news is that normal braking will be unaffected. These are fail-safe systems.

7. The biggest problem is lack of use. If a WSS fails, and you don't repair it, the lack of use can cause corrosion in the PMV over time, wiping out your solonoids. These little valves are what meters the brake fluid to each corner as needed.

(I know my ABS/TC systems )
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