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I’ve had ABS acting as soon as I start driving followed by the light coming on. Interestingly, light will stay off only when raining or soggy weather. Cleaning sensors didn’t help. While chasing another problem (temperature warning lamp) to clean pin 16 in big round connector behind the fire wall, I cleaned all the pins very thoroughly and ABS problem is gone!
Now, please tell me that ABS signal goes through the round connector and bad connection was to blame. If not, where was the glitch?
Cheers
 

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1991 164L
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OK I can tell you that but it is not 100% true.

Only thing for ABS system that goes through G151 Round connector behind false firewall to ABS computer is green wire from alternator at pin 13 which turns off ABS light when alternator comes on line after start up.

Same wire excites voltmeter gauge in dash to show alternator charging.

Maybe cleaning pin 16 cleaned pin 13, too.
 
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