ASR/ABS Lights - Page 2 - Mercedes-Benz Forum
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post #11 of 17 (permalink) Old 02-04-2007, 07:49 AM
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i have this problem too, i test pin #6 on the connector and the results was 4-15-27 blinks error code: what does it mean?
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post #12 of 17 (permalink) Old 02-04-2007, 01:29 PM
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Codes 4 and 27 indicate a problem with the left-rear wheel speed sensor, and code 15 indicates your ABS/ASR control module needs to be replaced.
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post #13 of 17 (permalink) Old 02-05-2007, 02:08 AM
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sometimes the abs asr light on the console stays on especially when the engine is cold, when i restart usually it's off when thr engine is warm;i washed the engine last month, should it be the cause of the fault of the abs/asr module? how much does it cost? i erased all error codes yesterdaw and today in the morning the abs asr lights stayed on again , i retest pin #6 with the code reader and only error 4 this time??????????thanks!

Last edited by fernandel; 02-05-2007 at 04:43 AM.
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post #14 of 17 (permalink) Old 02-05-2007, 10:53 PM
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I don't know the cost of a replacement module. I'd take a look at the wheel speed sensor at the left-rear wheel and look for damage to the wiring. If you have the WIS you will find there are electrical tests for the sensor.
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post #15 of 17 (permalink) Old 04-22-2019, 08:27 AM
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Looking for advice regarding ABS ASR lights that came on with my '95 SL500. I've read through all the threads on this topic I believe and still struggling to fix.

Symptoms: both lights on, speedometer bouncy. Otherwise car performance is fine. With 32 pin diagnostic connector, pin 6 has 3 flashes. (My diagnostic book is giving me conflicting info: one page says "left VSS sensor open circuit" and another page says "right VSS sensor open circuit" for this fault depending on model year but both list 1995).

Attempted fixes:
Battery voltage: 12.5V car off, 14.1V car on
Cleaned drivers side front speed sensor. Even swapped it with one from my SL320.
Cleaned passenger side front speed sensor (this one looked different - the surface was flat/didn't have the metal piece protruding out)
Cleaned drivers side rear speed sensor.
Replaced engine wiring harness (had this anyway and had been putting off the task).
Checked the 10 amp fuses in control module compartment

My next steps (in this order):
1) swap passenger side speed sensor with one from my SL320.
2) swap control modules with ones from my SL320

Am I missing something or any other suggestions? Fortunately I have the ability to "swap parts" before buying anything. Thank you for your help.
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post #16 of 17 (permalink) Old 04-22-2019, 01:50 PM
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Code "3" is for the left-front wheel sensor. See the diagnostic manual here for troubleshooting steps.
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post #17 of 17 (permalink) Old 05-06-2019, 02:46 PM
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Now that my son is back from college I am able to get back to the problem. With BobTerry's link to the manual, I was able to better diagnose the problem. Chapter 9.1, test 13.1 identified the problem. Across controller pins 10 and 30 I'm supposed to have 0.8-2.3 KOhms. I had over 200K Ohms. Then to identify where the problem was, I measured from the speed sensor plug on driver's front wheel to the plug between the fusebox and brake fluid reservoir. Wire 1 had no resistance, wire 2 had over 200K. Bingo! (I even compared to my SL320 to confirm the resistance should be almost zero with both wires).

Very odd failure given the wire has no cuts or abrasions. Anyway, ordered a used one on ebay for $30 but now must wait a week for it to arrive. I've attached a pic of the wire/cable from the left front wheel up to the fusebox area. It is for both the speed sensor and brake pad wear sensors.

BTW, not that difficult to remove the wire if you ever need to. Take the fusebox end and feed it through the wheel well.
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