SL/R230: SRS code 1010
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Joined: Jul 2015
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From: amarillo texas
2003 sl 500
SRS code 1010
My SRS light is on and my one indy friend checked it for free saying it is code B1010. He reset it but it is back on right away. That was the most he could do but did not charge me. I've read something about control unit undervoltage for that code. Need some help here or I guess it is off to my local MB indy. Could this be caused by the "person aboard" sensor? I think it came on with the car running as my passenger got in but was not on with just myself in the car. If it is that how hard to replace it and what part number would it be?
moretech
Last edited by moretech; Oct 23, 2017 at 09:30 PM.
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From: amarillo texas
2003 sl 500
Code B1010: N2/7 (restraint systems control unit): Undervoltage at terminal 15R/15
This was the only code shown by his scanner. If any member knows where the 15R terminal receives its signal from (SAM?) I might find my problem and solve it. I do not find any other electrical malfunctions in my displays or elsewhere. Thanks for any ideas!
moretech
This was the only code shown by his scanner. If any member knows where the 15R terminal receives its signal from (SAM?) I might find my problem and solve it. I do not find any other electrical malfunctions in my displays or elsewhere. Thanks for any ideas!
moretech
Last edited by moretech; Oct 24, 2017 at 09:53 PM.
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From: PNW Wa State
R230, C5 Corvette Convertible, Audi Allroad, Lexus RX350, AE86 Hachi Roku
Check your voltage. You might have a simple battery voltage issue.
Too bad you weren't close by. I have a Star SDS. You should do a total systems/ error check. It verifies if V are low or isolates individual fails
Try using a multimeter for now
Too bad you weren't close by. I have a Star SDS. You should do a total systems/ error check. It verifies if V are low or isolates individual fails
Try using a multimeter for now
Thread Starter
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Joined: Jul 2015
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From: amarillo texas
2003 sl 500
Thanks Hary, batt is at 12 volts and is an AGM only 5 months old. Also when the old one went bad and I got "consumers offline" almost daily it never set SRS codes. I do wonder a bit about the ignition switch, but it seems it throws a lot of stuff at you when it is busted. Is there a fuse I might check?
moretech
moretech
Last edited by moretech; Oct 25, 2017 at 03:02 PM.
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Joined: Jan 2007
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From: PNW Wa State
R230, C5 Corvette Convertible, Audi Allroad, Lexus RX350, AE86 Hachi Roku
Found this. IDK if it is relevant to your situation but maybe
http://www.benzworld.org/forums/w210...10-n2-7-a.html
http://www.benzworld.org/forums/w210...10-n2-7-a.html
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From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
You can check the voltage on circuit 15R by measuring voltage on any of the following fuses in the left-side fuse box: 11, 14, 16, 18, 21, 22.
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From: amarillo texas
2003 sl 500
Hey there Bob Terry you may have hit on something!! I measured the voltage on the "spare" fuse and the rear batt and they are identical. But my very new AGM batt seems to show only 11.5 v, starter batt 12v. I drove it some and the trunk battery shows 12v now. Tried the SRS light again but still is on. So I am thinking I will not yet see my MB indy. I do not have any other malfunctions but for sure with the switch on position 1 voltages are identical going battery to fuse box connector. However, I remember when my old trunk battery was saying consumers offline in the mornings my SRS light did work normally. Your thoughts are appreciated, understanding the circuit is imperative to a solution. One last thought, from this information, could the SRS module be shot and that is what is causing code B1010? I too am wondering about a wiring harness malfunction.
moretech
moretech
Last edited by moretech; Oct 26, 2017 at 01:55 PM.
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From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
You might check the integrity of the wiring. You might presume the connections at the ignition switch and SRS controller are fine and not bother with them. At the fuse box the 15R power connection from the ignition switch is made with a 2-wire connector labeled "C1" somewhere on the underside of the box. The 15R connection at the box going to the SRS controller is a 2-wire connector labeled "I2", though there is only a single wire.
If those connections are fine, I might do a simple experiment to learn something about the B1010 fault. How long must the voltage go low to set the fault? For the answer, with the ignition switch in position 2 I would remove the C1 connector and observe how much time elapses before the fault light is set. The length of time will dictate what strategy you use to monitor and detect a low-voltage event. I have several ideas on how you might do detection, and I may mention them in a later post.
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Thread Starter
Senior Member
Joined: Jul 2015
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From: amarillo texas
2003 sl 500
Thanks for all the help!!. I have one last thought. If I pull the SRS module from the console and try to check the connector plug for voltage (ignition on position 1) would more than one opening show positive in a good harness? I'm guessing not, but any idea which hole in the plug in connector is the 15R feed or its color code for 2003 year car.? I'll let you rest after this one!!
moretech
moretech
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From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
Thread Starter
Senior Member
Joined: Jul 2015
Posts: 355
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From: amarillo texas
2003 sl 500
Problem finally solved, problem was the seat belt pretensioners. Ended up replacing both at my MB indy. He reset my SRS light but was sure it would come back, which it did a few days later. He said really both should be replaced which I did when it came on again, No problems since driving it the last week.
moretech
moretech
