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> ABS fault when third brake light removed
ESP125
post Mar 17 2015, 01:44 AM
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Hi,

Just wondering if anybody has ever removed their third (high mount) brake light on a 94 Camaro and had to deal with the AB inop fault that occurs? I have been doing some reading online and apparently they integrated the high mount bulbs into the ABS circuit and if you remove the assembly or have a burned out bulb your ABS will stop working. Hats off to the genius who came up with this design! Any help would be appreciated, thanks.
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Blainefab
post Mar 17 2015, 04:26 AM
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I use a 1Kohm 1/2watt resistor (Radio Shack has them) - wire it across the 2 small wires that go directly to the lamp assembly.
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ESP125
post Mar 21 2015, 06:25 PM
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QUOTE (Blainefab @ Mar 16 2015, 11:26 PM) *
I use a 1Kohm 1/2watt resistor (Radio Shack has them) - wire it across the 2 small wires that go directly to the lamp assembly.


I finally got the 1K ohm resistor and hooked it up and the ABS inop light didn't turn off. Just for giggles I added another resistor in series and that didn't help either. I made sure the connection to ground was good and that the connection to the yellow wire (brake) was good but no change. I basically have the resistor between the brake wire and ground. Do you have any other suggestions?
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Blainefab
post Mar 22 2015, 12:42 AM
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QUOTE (ESP125 @ Mar 21 2015, 11:25 AM) *
QUOTE (Blainefab @ Mar 16 2015, 11:26 PM) *
I use a 1Kohm 1/2watt resistor (Radio Shack has them) - wire it across the 2 small wires that go directly to the lamp assembly.


I finally got the 1K ohm resistor and hooked it up and the ABS inop light didn't turn off. Just for giggles I added another resistor in series and that didn't help either. I made sure the connection to ground was good and that the connection to the yellow wire (brake) was good but no change. I basically have the resistor between the brake wire and ground. Do you have any other suggestions?


Put the wiring back to stock and plug the 3rd brake light back on it - if the ABS err light goes out then you have wired the resistor incorrectly. If the ABS err light stays on then you have an additional problem that you'll need to solve before trying the resistor again.
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ESP125
post Mar 22 2015, 01:14 AM
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QUOTE (Blainefab @ Mar 21 2015, 07:42 PM) *
QUOTE (ESP125 @ Mar 21 2015, 11:25 AM) *
QUOTE (Blainefab @ Mar 16 2015, 11:26 PM) *
I use a 1Kohm 1/2watt resistor (Radio Shack has them) - wire it across the 2 small wires that go directly to the lamp assembly.


I finally got the 1K ohm resistor and hooked it up and the ABS inop light didn't turn off. Just for giggles I added another resistor in series and that didn't help either. I made sure the connection to ground was good and that the connection to the yellow wire (brake) was good but no change. I basically have the resistor between the brake wire and ground. Do you have any other suggestions?


Put the wiring back to stock and plug the 3rd brake light back on it - if the ABS err light goes out then you have wired the resistor incorrectly. If the ABS err light stays on then you have an additional problem that you'll need to solve before trying the resistor again.


I lucked out my neighbor is a mechanic by trade and he had his Tech 2 scanner at home and we found the right front hub sensor was shot. Go figure, it was fine before I put the car in storage this winter. I am going to swap out the hub and try the resistor thing again and I expect all will be good. Thanks again for the help.
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Posts in this topic
ESP125   ABS fault when third brake light removed   Mar 17 2015, 01:44 AM
BumpaD_Z28   QUOTE (ESP125 @ Mar 16 2015, 07:44 PM) Hi...   Mar 17 2015, 02:26 AM
ESP125   Any idea on what size resistor and how many watts ...   Mar 17 2015, 03:17 AM
Blainefab   I use a 1Kohm 1/2watt resistor (Radio Shack has th...   Mar 17 2015, 04:26 AM
ESP125   Thanks Alan. I will give that a try when Radio Sh...   Mar 18 2015, 03:02 AM
ESP125   QUOTE (Blainefab @ Mar 16 2015, 11:26 PM)...   Mar 21 2015, 06:25 PM
Blainefab   QUOTE (ESP125 @ Mar 21 2015, 11:25 AM) QU...   Mar 22 2015, 12:42 AM
ESP125   QUOTE (Blainefab @ Mar 21 2015, 07:42 PM)...   Mar 22 2015, 01:14 AM
Steve91T   What does the third brake light have to do with AB...   Mar 17 2015, 11:11 AM

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