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Mercedes W129 error ABS
01-11-2017, 12:26 PM
Post: #1
Mercedes W129 error ABS
Hello everyone, have if someone has information or know something else. I have a Mercedes W129 of the year 91.
I lit the ABS light and traction control. The engine has no power. In the old connector, not the round, but the previous one, in pin 10 with lights I got the code 29.
For car of 91 I do not get that code, but from 94 if this fault comes out as a lateral acceleration sensor. But this car does not carry, that was for stability control.
Did anyone touch any of these?
a greeting
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01-11-2017, 10:13 PM
Post: #2
RE: Mercedes W129 error ABS
ABS at W129 1990-1993 year not diagnosed,look Star-Finder
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01-12-2017, 09:29 PM
Post: #3
RE: Mercedes W129 error ABS
Hi, thanks for your reply, on the right front of the engine hood, the other side of the plate that keeps ECU abs, ecu motor .... there is a plugged connector. Pin number 10 is for analog diagnosis by ABS / ASR blinking. This gives code 29. Check with an outline all the feeds to the ECU, the relay with 2 fuses above is also OK. In Mercedes they told me that car is in the book nothing digital, but it is so old that they no longer have that book where all the information is Sad
So ask if anyone knows anything about this.
Thank you.
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03-08-2017, 10:52 AM (This post was last modified: 03-08-2017 10:53 AM by B67FSTB.)
Post: #4
RE: Mercedes W129 error ABS
Did you changed that relais which has on top 1 or 2 fuses ?.
When does the light come on ?
After engine starts or when you drive a few meter ?
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03-08-2017, 11:24 AM (This post was last modified: 03-08-2017 11:26 AM by Jan1980.)
Post: #5
RE: Mercedes W129 error ABS
Yes, B67FSTB is 1000% right. I had this case very often on older 129 SL. Change the √úberspannungsschutzrelais (over voltage secure relay). It is on the right side behind firewall. You have to remove the plastic cover. Original, on the top of the relay is just one fuse with 10 ampere. On the newer version (which you get if you buy new one) are 2 fuses with 10 ampere. This relay supports ABS and engine ecu with voltage.

In germany, it is 70 Euros. This relay is always the first step on these old benz cars !!

BTW, on these older benz cars before 1995, not possible to make diagnostic with star diagnosis. Only blink code or genuine benz blink code counter with 7 segment display..
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