C207 E350 – SRS Pelvis Airbag (9CD1) High Resistance When Adjusting Seat
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2012 E350
C207 E350 – SRS Pelvis Airbag (9CD1) High Resistance When Adjusting Seat
Hey everyone,
I’ve got a C207 E350, and I’m running into an issue with the left SRS (pelvis airbag) warning light. The code is 9CD1 – Ignition Circuit, Left Pelvis Airbag, High Resistance.
The warning light only comes on when I adjust the seat using the power controls—leaning in, leaning up, or moving it forward. It doesn’t happen every time, but when scanning, I’ve noticed resistance spikes in the ignition circuit.
Has anyone dealt with this before? Could it be a wiring issue under the seat, a loose connector, or something deeper in the SRS system? Any advice on troubleshooting would be appreciated!
Thanks!
I’ve got a C207 E350, and I’m running into an issue with the left SRS (pelvis airbag) warning light. The code is 9CD1 – Ignition Circuit, Left Pelvis Airbag, High Resistance.
The warning light only comes on when I adjust the seat using the power controls—leaning in, leaning up, or moving it forward. It doesn’t happen every time, but when scanning, I’ve noticed resistance spikes in the ignition circuit.
Has anyone dealt with this before? Could it be a wiring issue under the seat, a loose connector, or something deeper in the SRS system? Any advice on troubleshooting would be appreciated!
Thanks!
Super Member
Joined: Aug 2004
Posts: 954
Likes: 245
E550 Coupe 2wd (2016)
I'd assume the seat is drawing too much power, but with these cars who knows. The faults and what are not exactly based on reality, they are based on what the computer(s) are set to assume is wrong and they do not have a big vocabulary. Like a baby screaming, leaving you to wonder wth do you want??
If it were me I'd ignore it altogether, especially since I have no need to move the seat because I've learned the hard way that other people break your things, wife included, kids guaranteed. So nobody drives my car.
Optionally, if you want, I would unplug all the connections and plug them back in, and check for water damage at that moment. I doubt it matters but the safe thing would be to unplug the battery when doing it. Airbags are scary, both expensive and the damage they cause to the car, so the last thing you want is to trip one. I wish my car didn't have them at all.
I also wonder; does it fault when the eng is running, or only when off? Because the voltage drops lower when off so it's a clue.
If it were me I'd ignore it altogether, especially since I have no need to move the seat because I've learned the hard way that other people break your things, wife included, kids guaranteed. So nobody drives my car.
Optionally, if you want, I would unplug all the connections and plug them back in, and check for water damage at that moment. I doubt it matters but the safe thing would be to unplug the battery when doing it. Airbags are scary, both expensive and the damage they cause to the car, so the last thing you want is to trip one. I wish my car didn't have them at all.
I also wonder; does it fault when the eng is running, or only when off? Because the voltage drops lower when off so it's a clue.
Thread Starter
Newbie
Joined: Mar 2025
Posts: 2
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2012 E350
So I found a workaround—unplugged the battery, removed the seat, and tucked in the wires that were on the ground. After placing the seat back, the resistance dropped to around 3-4, which was below the fault-triggering threshold. Then I zip-tied the wire to the base of the seat, which lifted the connector slightly since it was drooping. That brought the resistance down even further to 2.59-2.61, which was perfect. Now, no matter how much I adjust the seat, the resistance stays stable. The driver’s seat is sitting at around 2.51, which is just 0.1 higher than normal—not bad at all. So I guess the connectors were the real issue.
Last edited by hridayahujaaa; Mar 16, 2025 at 08:38 AM.
