C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

The Deaded ABS/E-Brake Light

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Old Jul 26, 2018 | 09:54 PM
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Default The Deaded ABS/E-Brake Light

Hi All,
Have an 88 Vette which I bought a few weeks back. When I bought it, the ABS & E-Brake lights were on. The previous owner, who had the car for over 20 years, said the lights had been on for years, and that the E-brake works fine. I did a lot of searching online and found that most people suggest to replace the ABS Relay module located in the well behind the driver's seat to resolve this issue.
I replaced that module today and got the following outcome:
The ABS & E-Brake lights are still on, but once started, the Vette would not turn off, even with the key removed from the ignition (!!!). Additionally, none of the interior lights would illuminate. I pulled the new ABS Relay and put the old one back in, and that at least got the Vette back to normal operating condition.
Yes, this is my first Vette. I usually work on old trucks, so a 1988 Vette is "new" to me.
I have no guides other than a Haynes manual. The car runs fine, the E-Brake appears operational and not stuck in any way, but those dash lights drive me crazy and I would really like to fix this issue. Has anyone had this effect when replacing the ABS Relay?
Thanks in advance for the help.
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Old Jul 27, 2018 | 03:37 PM
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Originally Posted by carsofchaos
Hi All,
Have an 88 Vette which I bought a few weeks back. When I bought it, the ABS & E-Brake lights were on. The previous owner, who had the car for over 20 years, said the lights had been on for years, and that the E-brake works fine. I did a lot of searching online and found that most people suggest to replace the ABS Relay module located in the well behind the driver's seat to resolve this issue.
I replaced that module today and got the following outcome:
The ABS & E-Brake lights are still on, but once started, the Vette would not turn off, even with the key removed from the ignition (!!!). Additionally, none of the interior lights would illuminate. I pulled the new ABS Relay and put the old one back in, and that at least got the Vette back to normal operating condition.
Yes, this is my first Vette. I usually work on old trucks, so a 1988 Vette is "new" to me.
I have no guides other than a Haynes manual. The car runs fine, the E-Brake appears operational and not stuck in any way, but those dash lights drive me crazy and I would really like to fix this issue. Has anyone had this effect when replacing the ABS Relay?
Thanks in advance for the help.
Do a search on abs, there are many threads out there including one I did where I fixed mine. I suspect you either got the wrong relay or the one you have is bad and someone has screwed around with the wiring. Get a FSM, Haynes don't cover everything that's needed and don't have a lot of the diagnostics you'll need to fix your car now and in the future.
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Old Jul 27, 2018 | 04:21 PM
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Hi Hcbph,
I did look through the forum extensively, and I think your thread is the one I used to narrow down some of the possible causes. Sounds like the ABS Relay module is the culprit 95% of the time, which is why I went with that first. It is possible that I got a bad replacement relay, as I cannot imagine an ABS Relay module would cause the engine to not turn off!
May I pose a probably very stupid question: does the ABS Relay module need to be grounded? I noticed that the aftermarket module has a metal clip with a screw hole in it. The module I pulled out did not have a screw hole, just a metal clip that attached to a prong.
The part I purchased is this:
https://www.corvettemods.com/C4-Corv...SABEgLhFvD_BwE

Working on getting an FSM as well.

Thanks,

Keith
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Old Jul 27, 2018 | 06:24 PM
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The switch may need to be adjusted(bent) or you could pull the wire off.
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Old Jul 27, 2018 | 08:09 PM
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I'm wondering if I'm looking at the wrong relay. The one i bought it on the left, the one i pulled out of the car is on the right. They seem to be different relays, though they havw the same pins on the back.
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