SL/R129: ABS, ASR lights come on after changing harness on SL600
Thread Starter
Newbie
Joined: Apr 2014
Posts: 3
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sl600r129
ABS, ASR lights come on after changing harness on SL600
Hello,
I am getting really desperate with my 1995 R129 SL600.
I had to change on my pre-facelift 1995 main engine harness (harness for mass airflow sensors, crank sensor, etc.) because the ASR light was coming on and occasionally the car went to limp mode. I also changed brake fluid, o-ring on gearbox, set position of gear lever and rewired passenger-side ETA, and changed the harness for starter and oil sensors. In addition, catalytic convertors were changed.
The cables for injectors, between right and left ETA are original and they were checked and seem to be okay. I torn the black insulation and checked the wires.
However, the ABS and ASR lights are still coming on just when you turn the ignition key to position two and they do not come out. ABS and ASR systems are working properly. On MB star diagnostic there are no faults. The car is not entering the limp mode any more. The wheel sensors do not indicate any problems as they indicate same rotation on all wheels. The steering wheel sensor is initiated and indicates the steering right.
I tried ETAs, ABS+ASR unit, left and right side engine control units, fuse box and E-GAS from different working SL600 with no changes. No faults reported but the lights were still on. We also tried to change the dashboard.
Both ETAs show similar volts at diagnostic in different positions. Mass airflow sensors also show similar results (+/- 5 %).
I checked the battery.
We tried also to refill the brake fluid again, set the neutral position switch. The lights are still on (also with pushed brake pedal).
Surprisingly, no changes occurred. I went through many threads here, in German forums and so on. But still I am not able to figure out where the problem is. Yesterday, I found that it could be caused by brake light switch but I really do not know. I have spent almost 10,000 dollars and plenty of time with no effect. Do you have any idea what could be the problem?
Thank you very much. Regards,
Martin
I am getting really desperate with my 1995 R129 SL600.
I had to change on my pre-facelift 1995 main engine harness (harness for mass airflow sensors, crank sensor, etc.) because the ASR light was coming on and occasionally the car went to limp mode. I also changed brake fluid, o-ring on gearbox, set position of gear lever and rewired passenger-side ETA, and changed the harness for starter and oil sensors. In addition, catalytic convertors were changed.
The cables for injectors, between right and left ETA are original and they were checked and seem to be okay. I torn the black insulation and checked the wires.
However, the ABS and ASR lights are still coming on just when you turn the ignition key to position two and they do not come out. ABS and ASR systems are working properly. On MB star diagnostic there are no faults. The car is not entering the limp mode any more. The wheel sensors do not indicate any problems as they indicate same rotation on all wheels. The steering wheel sensor is initiated and indicates the steering right.
I tried ETAs, ABS+ASR unit, left and right side engine control units, fuse box and E-GAS from different working SL600 with no changes. No faults reported but the lights were still on. We also tried to change the dashboard.
Both ETAs show similar volts at diagnostic in different positions. Mass airflow sensors also show similar results (+/- 5 %).
I checked the battery.
We tried also to refill the brake fluid again, set the neutral position switch. The lights are still on (also with pushed brake pedal).
Surprisingly, no changes occurred. I went through many threads here, in German forums and so on. But still I am not able to figure out where the problem is. Yesterday, I found that it could be caused by brake light switch but I really do not know. I have spent almost 10,000 dollars and plenty of time with no effect. Do you have any idea what could be the problem?
Thank you very much. Regards,
Martin
Super Member
Joined: Jul 2010
Posts: 598
Likes: 19
From: Eastern Kansas
94 SL 600, 98 993, 89 XJS Conv., 85 Daimlier Princess 16 Hybrid Lincoln 16 Chevy crewcab
You have done a lot of replacement. You have no codes?
The faulty insulation issues is the reason for harness replacement and that can effect the "brain". many codes are highlighted with the harness crosstalk voltage leaks or direct shorts of the electrical system. My experience it does not end with the wire! In the states, in certain climates the old fuse clad with Al has caused an erosion with the Cu contact points. That resulted in irregular current to the very sensitive electrical system.
The brake light switch is a major input, and relative easy to replace.
The wheel sensor issue in the US has much to do with cruise control and the use of altered tire size with profile and tread width.
All of the inputs end up in a control module, so for me that is where the lights and LHM are generated.
Where in the world are you??
Good luck with your expensive toy!
The faulty insulation issues is the reason for harness replacement and that can effect the "brain". many codes are highlighted with the harness crosstalk voltage leaks or direct shorts of the electrical system. My experience it does not end with the wire! In the states, in certain climates the old fuse clad with Al has caused an erosion with the Cu contact points. That resulted in irregular current to the very sensitive electrical system.
The brake light switch is a major input, and relative easy to replace.
The wheel sensor issue in the US has much to do with cruise control and the use of altered tire size with profile and tread width.
All of the inputs end up in a control module, so for me that is where the lights and LHM are generated.
Where in the world are you??
Good luck with your expensive toy!
Thread Starter
Newbie
Joined: Apr 2014
Posts: 3
Likes: 0
sl600r129
Hello,
when you start up the car, the ABS, ASR lights are on and do not turn off. There no faults when you start the car on diagnostics. However, I think that it is not caused by the sensors, because even after a short ride (5 miles) no faults appears on MB diagnostic. However, after longer ride (60-100 miles) it enters the limp mode (after pushing the accelerator, with parked car and with transmission in position N) and after that there were at diagnostics following faults:
(1) S16/3 neutral centre switch
(2) Right ETA
(3) Lambda
Moreover, the brake light switch was with no effect replaced.
when you start up the car, the ABS, ASR lights are on and do not turn off. There no faults when you start the car on diagnostics. However, I think that it is not caused by the sensors, because even after a short ride (5 miles) no faults appears on MB diagnostic. However, after longer ride (60-100 miles) it enters the limp mode (after pushing the accelerator, with parked car and with transmission in position N) and after that there were at diagnostics following faults:
(1) S16/3 neutral centre switch
(2) Right ETA
(3) Lambda
Moreover, the brake light switch was with no effect replaced.
Thread Starter
Newbie
Joined: Apr 2014
Posts: 3
Likes: 0
sl600r129
You have done a lot of replacement. You have no codes?
The faulty insulation issues is the reason for harness replacement and that can effect the "brain". many codes are highlighted with the harness crosstalk voltage leaks or direct shorts of the electrical system. My experience it does not end with the wire! In the states, in certain climates the old fuse clad with Al has caused an erosion with the Cu contact points. That resulted in irregular current to the very sensitive electrical system.
The brake light switch is a major input, and relative easy to replace.
The wheel sensor issue in the US has much to do with cruise control and the use of altered tire size with profile and tread width.
All of the inputs end up in a control module, so for me that is where the lights and LHM are generated.
Where in the world are you??
Good luck with your expensive toy!
The faulty insulation issues is the reason for harness replacement and that can effect the "brain". many codes are highlighted with the harness crosstalk voltage leaks or direct shorts of the electrical system. My experience it does not end with the wire! In the states, in certain climates the old fuse clad with Al has caused an erosion with the Cu contact points. That resulted in irregular current to the very sensitive electrical system.
The brake light switch is a major input, and relative easy to replace.
The wheel sensor issue in the US has much to do with cruise control and the use of altered tire size with profile and tread width.
All of the inputs end up in a control module, so for me that is where the lights and LHM are generated.
Where in the world are you??
Good luck with your expensive toy!
Do you think that it can be caused by connectors or the harness between ETAs and ECU? We checked the cable several times and it appears to be OK- the insulation is not damaged. Thank you very much.
Regards, Martin
