Roll Bar Issues - Mercedes-Benz Forum
 
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post #1 of 9 (permalink) Old 04-30-2019, 05:44 PM Thread Starter
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Roll Bar Issues

I've recently been having issues with my roll bar in my 1992 500SL. The first issue is that occasionally the roll bar light with blink in dash and the red arrows will also blink on the buttons for a couple seconds at a time, then it just goes away. The roll bar will operate just fine with the button even when the lights are on. The second issue is that it's been way too sensitive. It pops up all the time in normal driving behavior. It has started to always go up when I drive over a bump on my driveway even though I'm going almost nothing, it has popped up when I am driving straight on a perfectly smooth road, and it even has popped up when I've turned on the car and have done nothing at all. Little bumps also make it pop up too, which are (sadly) very common where I live. I've taken it to the Mercedes Specialist that I normally have work on it, and he is unsure what is wrong (he tends to be very knowledgeable on the R129 models), and the dealer ship where I live won't work on it since they don't have any mechanics anymore that are familiar with the most of the 90s Mercedes. Does anybody has suggestions or ideas as to what might be causing these issues?
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post #2 of 9 (permalink) Old 04-30-2019, 06:23 PM
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Originally Posted by JR9989 View Post
I've recently been having issues with my roll bar in my 1992 500SL. The first issue is that occasionally the roll bar light with blink in dash and the red arrows will also blink on the buttons for a couple seconds at a time, then it just goes away. The roll bar will operate just fine with the button even when the lights are on. The second issue is that it's been way too sensitive. It pops up all the time in normal driving behavior. It has started to always go up when I drive over a bump on my driveway even though I'm going almost nothing, it has popped up when I am driving straight on a perfectly smooth road, and it even has popped up when I've turned on the car and have done nothing at all. Little bumps also make it pop up too, which are (sadly) very common where I live. I've taken it to the Mercedes Specialist that I normally have work on it, and he is unsure what is wrong (he tends to be very knowledgeable on the R129 models), and the dealer ship where I live won't work on it since they don't have any mechanics anymore that are familiar with the most of the 90s Mercedes. Does anybody has suggestions or ideas as to what might be causing these issues?
Possibly the switches on the rear control arms.

John;
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post #3 of 9 (permalink) Old 04-30-2019, 07:52 PM
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For safety reason : leave the rollbar UP until you get it fixed.
There was an incident (I think it was in England) that a child riding in the rear seat was decapitated when the rollbar popped.
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post #4 of 9 (permalink) Old 04-30-2019, 08:00 PM
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You can correct the sensitivity issue by adjusting the limit switches contacting the control arms. The procedure is explained here: https://www.benzworld.org/forums/r12...r-sensors.html.

To learn why the LEDs are illuminated on the roll bar control switch you read codes from diagnostic socket #7. A procedure is here: https://www.benzworld.org/forums/r12...ml#post1925941.
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post #5 of 9 (permalink) Old 05-01-2019, 05:19 AM
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Pardon the intrusion, but I would like to piggy-back onto this thread for owners of newer cars (after '95-96). Newer cars apparently use accelerometers built in to the controller, rather than extension switches on the rear suspension. I have two controllers, My original one and a used replacement with known heritage and alleged correct functionality. In each case, I am left with a flashing roll bar switch (and an illuminated instrument cluster light). My soft-top button also does not illuminate as described at end of cycle or when first turning the key on (and switch is new from MB). SDS indicates faulty controller for which I think I have eliminated as cause by replacement (SDS also points to faulty switch for soft top, but it is new/has been replaced). Here is where it makes even less sense:
With both controllers, raising and lowering the soft top (and placement/removal of hard top) works flawlessly. with the original controller, the roll bar would stay lowered if it was lowered to begin with, and would lower/raise if the bar was up. This appears to correspond to how its function is described in the owners' manual. The replacement known-to-be-good controller behaves slightly differently. When raising/lowering the soft top, the roll bar will raise after the cycle is finished, regardless of its initial position. When placing the hard top, with both controllers the roll bar remains down after completion of placement/removal. Also, in each controller, regardless of the position of the windows initially, they raise when finishing the cycle of the tops, in either deployed/stowed, hard top or soft top.
The flashing roll bar lights can be extinguished by raising the roll bar a coupl'a inches and, of course, the roll bar lights do not flash with the bar in the fully upright position.

http://manual.startekinfo.com/manual...3/11_2/m13.jsp

I have given up on this issue, and placed two small pieces of black tape on the switch and left the instrument cluster bulb out.
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Best Regards...

RM Smith
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Last edited by Ears; 05-01-2019 at 06:01 AM.
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post #6 of 9 (permalink) Old 05-01-2019, 05:26 AM
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Originally Posted by Ears View Post
Pardon the intrusion, but I would like to piggy-back onto this thread for owners of newer cars (after '95-96). Newer cars apparently use accelerometers built in to the controller, rather than extension switches on the rear suspension. I have two controllers, My original one and a used replacement with known heritage and alleged correct functionality. In each case, I am left with a flashing roll bar switch (and an illuminated instrument cluster light).

I have given up on this issue, and placed two small pieces of black tape on the switch and left the instrument cluster bulb out.
This may help I had the same issue on my 98 SL500 after replacing a controller. There is a code that needs to be cleared with the Star system.

John;
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post #7 of 9 (permalink) Old 05-01-2019, 05:34 AM
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This may help I had the same issue on my 98 SL500 after replacing a controller. There is a code that needs to be cleared with the Star system.
Thanks, but no joy in my case...

Best Regards...

RM Smith
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post #8 of 9 (permalink) Old 06-11-2019, 05:22 PM Thread Starter
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It turns out switches on the rear control arm were the issue. There were some other things that had to be fixed too but it appears to be doing fine. It turns out the person I take it to already had dealt with this sort of thing before but I guess I didn't describe the issue to him that well the first time (English isn't his first language so I must have been unclear). Thank you for helping.
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post #9 of 9 (permalink) Old 06-11-2019, 05:51 PM
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If you're getting codes in the mid to upper 30s (35, 36, 37, 38, etc.) in SDS then the accelerometer in the controller has issues.

The problems described here with the roll bar working properly but wanting to remain in the "up" position at all times to get the blinding red lights out in the rocker switch are a symptom of this.

Essentially the controller will not work in a roll over condition as expected, so the controller wants the roll bar deployed at all times for safety purposes.

BBA Reman has the ability to repair/clear this fault. I sent my controller to them and they successfully rebuilt it and cleared this issue. It's worked flawlessly since then and has a lifetime guarantee, too.

Dan
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