Mercedes-Benz Forum

Mercedes-Benz Forum (https://www.benzworld.org/forums/)
-   R129 SL-Class (https://www.benzworld.org/forums/r129-sl-class/)
-   -   ASR/ABS Lights (https://www.benzworld.org/forums/r129-sl-class/1301792-asr-abs-lights.html)

royvan 01-29-2007 08:20 AM

ASR/ABS Lights
 
I'm having a problem with the ABS/ASR lights staying on when I first start my 94 320SL. Mechanic said that it was a problem with the speed sensors. Replace both front sensors. Lights still come on. When the car warms up however and I turn the car off and re-start it, they stay off. They never go off by them selves after the car reaches operating temperature. I'm told that the electronics on the 129 are sensative to the cold. Has anyone else had this problem? Could it be because of the cold in NJ or a wiring harness issue or other. The SRS light also stays on for about 2-3 minutes but does go out.
Any thoughs from others is appreciated.

Dr.DJC 01-30-2007 01:56 AM

If the batery has been disconnected or run flat these two lights stay on, even when there's no problem in the system. A merc dealer or speciallist should be able to reset them. I had the same problem when I bought a 1991 R129 a couple of weeks ago. It had been left standing over the Christmas and new year break and the TOAD had flattened the battery. It was taken to a merc specialist who reset the system. Batteries are definately sensitive to cold.

I gather there are sometimes problems with the wiring loom on the 93s and 94s chafing and causing wear that results in shorts, although I've not heard any stories about the loom being sensitive to cold.

Hope this helps.

bobterry99 01-30-2007 02:12 AM

Quote:

Originally Posted by royvan
Any thoughs from others is appreciated.

Read codes with an LED. If you need help with that, you can send me an email.

royvan 01-30-2007 05:33 AM

Code Reading
 
Thanks Bob for the offer. I've made a code reader based on the information I've
gleened from the forum. My car only has the 16 pin socket. Both light come on at the same time which leads me to believe it might be a short or something. As I wrote, when the car is cold the lights come on until it warms up. Then, if I turn it off and restart, they go off. They never go off unless I restart. What codes and what socket could I test to see if there is a trouble fault? Also, in using the LED do you hold the button and keep the light on 2-4 seconds or release it to get the fault to light.
I have disconnected the battery to try to clear the fault. Should I try that again?
Thanks for your help.
Roy

bobterry99 01-30-2007 06:16 PM

Quote:

Originally Posted by royvan
Also, in using the LED do you hold the button and keep the light on 2-4 seconds or release it to get the fault to light.

Yes.

Quote:

Originally Posted by royvan
I have disconnected the battery to try to clear the fault. Should I try that again?

I don't believe this can help. But it can't hurt.

Roy, if your car has a 16-socket connector I don't believe you can read codes for the ASR/ABS. But the info I has shows that you should have the round 31-socket connector...

If you send me an email, I can reply with a very basic listing of the codes. But I recommend that you purchase the R129 Tech DVD from MBUSA for about $75 (1-800-FOR-MERC). If that's more than you want to spend, I suggest the Mercedes WIS software that you can buy on eBay for about $15 shipped.

feras 01-30-2007 06:51 PM

i have the same problem... some times i get abs /asr lights on and i need to restart the car to reset it.. it doesn't clear it self ... i think the problem related to the battery voltage and connection..if you got low voltage u get the lights on and need to restart the car to reset it. check the positive plug ont the battery there is a red wire ,,make sure it is connected to the plug and free of carbon..

Bawbag 01-31-2007 03:59 AM

Brake switch
 
Could be a faulty brake switch, in the drivers area just above the brake pedal,
I replaced mine and have never had a problem since with the abs/asr light staying on, it is a bitch to get at though....

royvan 01-31-2007 07:27 AM

Abs/asr
 
I've read about the brake switch but wondered why the light still comes on without even depressing the brake. I'll try a voltage check and cleaning the contacts. Also, Bob's suggestion about the DVD is good. My car does not have the 32 pin socket. It's a 1994 320 SL and only have a 16 pin socket. Having the sockets locations and fault codes will help. Hope it warms up on NJ soon so I can get this baby straightened out.

royvan 01-31-2007 08:04 AM

Asr/abs
 
Bob,
I tried to send you a personal e-mail but, your message box is full. I would appreciate getting the codes. I'm not sure that I'm using the reader correctly. When I press the button on it I get a light on all sockets. Do you have to release the button after you get the light for the code to appear?
Seems funny also that the brake light would be the problem since the light comes on even though I don't depress the brake peddle.

bobterry99 01-31-2007 01:03 PM

Roy --

Send me an email -- not a PM -- an email. Then I can reply to you with an attachment.


All times are GMT -7. The time now is 08:05 AM.

Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.