Finally got back to the ASD issue - after several years of other distractions.

The rectangular warning lamp was lit during start sequence and after start - didn't go out. So, Pulled codes using homemade tester and by jumping #5 to ground to read the flashes on the warning lamp - right front wheel sensor was shown as faulty so pulled it and degunked the tip where there was a lot of brake dust buildup, did same with left wheel and the differential speed sensor.

Reset the code and tested codes after a couple of days of driving. Got none. However, the yellow triangular lamp never lit - I spun rear end around on a gravel area near road and watched for the lamp to light, but never did ...is there some way to tell seat of pants if the ASD is working? Shouldn't it flash as the rear wheel lose traction?

Some of threads indicate the triangular lamp should be lit during start sequence - mine is NOT - I don't recall it ever being lit during start - could it simply be bulb? If there is no other indication in feel, is there anything else I am missing or should I just pull cluster and check the bulb (I've done cluster before and hate it :-))

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg

Check that bulb. It should light with key turned on and definitely flash when spinning out in gravel. What about if you hit the switch? It should stay on. Maybe there is a fuse for it?

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius

BioPete,

My 350 SDL doesn't have a switch ... Ya think the triangle bulb should be lit during startup sequence regardless of other potential malfunctions? I was going down this path, as well ...just don't have enough info to conclude that.

__________________
George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg

Is the "ASD" lamp flashing up when ignition is on?

Dr S,

Rectangular "ASD" light on bottom row right lights during start sequence with key on, but goes out when engine starts. Triangular light does not light during start sequence, or when rear tires spin on gravel.

__________________
George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg

Check connection between the ECU and the "triangular" lamp, electronic components of the "triangular" lamp system, also check bulb. If all is working properly, the electronic control unit of the ASD is damaged.