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Hummer Knowledge Base

The Hummer Knowledge Base

ABS Codes:

The H1 has a 16 pin OBDII connector like this:

Pins 4 and 15 are the ones that need to be jumpered. The codes are in two parts, i.e. 3-6 or 2-8 forinstance. There are probably around fifty possible codes, and more than one can be held by the ABS ECU.

The code sequence starts with a slow off/on/off, fast on/slow off then the actual code is flashed. If the light doesn't flash at all the warning light relay should be removed while leaving the jumper in place. If (when) the jumper is removed the code will be cleared.


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