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Re: ABS not functioning, indicators-OK

Looked at the shop manual for my Coupe Quattro; goes through a fancy
checkout procedure using a (expensive?) Audi tool.  One hint was that
the ABS was tied into the brake light switch.  The wiring diagram shows
it is getting a power supply through this switch.  Could be if the switch or
a connection is dead, it's not powering the ABS.

Existence of Brake lights is easy to check; then I'd take it back to the 
fatheads who worked on it to begin with.

Ray Calvo (porsrya@aol.com)
1990 Coupe Quattro

In a message dated 96-12-15 02:08:53 EST, you write:

 From: Myke456@aol.com
 Date: Sat, 14 Dec 1996 14:53:15 -0500
 Subject: ABS not functioning, indicators-OK
 I've just had all the sensor caps replaced (3 found cracked). Before
 replacing, the "ABS OFF" indicator would illuminate within 1 mile of
 off. Following replacement this indicator stays off, but the ABS is not
 functioning as follows...
 1) "ABS off" light illuminates when ignition power is initially turned on,
 then shuts off when engine starts, and stays off while driving--as normal.
 2) If, while driving, I push the ABS switch, the "ABS off" light
 Push the ABS switch again, and the "ABS off" light shuts off--as normal.
 3) I've done a number of intentional braking tests on ice/slush and have
 found the wheels lock up (definitely no ABS action) identically when the
 off" light is intentionally illuminated (with the switch) and off.
 4) When I lock the diffs., they engage and the "ABS off" light
 illuminates--as normal.
 I've checked the fuse in the ABS controller (left knee relay panel)-OK
 Anyone have any ideas on what to check next?
   ([____]=====OOOO=====[____])   87 5kcsTQ, 197k miles
  []]]]]]]][Mike Aiello][[[[[[[]     original owner
        Dutchess County, NY