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Old 02-06-2017, 03:08 PM
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Airbag fault code 93C6 - backrest lock for driver's seat

Last week my 2008 E70 iDrive screen began warning me of an ABS system problem. When I ran the Carly diagnostics, it came up with fault 93C6, which seems to be the back rest lock of the driver seat. Low and behold, none of the driver seat controls work any more either. Looking for suggestions on where to look first, as it seems that the indication is related or directly resulting from the seat controls going INOP.
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2008 E70 X5 3.0si

Last edited by PHL08; 02-07-2017 at 12:18 PM.
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Old 02-17-2017, 09:05 AM
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I need to look at this further over the weekend. I did locate the fuse panel in the rear with the diagram showing the seat and seat heater fuse location(s). I didn't find any popped out. Several weren't even there, which I take it to mean they're not supposed to be since this panel is probably used in various models. It's unlikely anyone pulled them out.

With driver side seat controls that are completely INOP and seat heater working intermittently or not at all (sometimes it stays on and randomly shuts off, other times it won't stay on at all), trying to get some advice on the best place to start looking for the simplest cause.
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Old 03-12-2017, 09:13 AM
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After more tinkering, found the fuse (101) that failed. After replacing the fuse and clearing the faults, everything is ok...sort of.

I can replicate the problem reliably now:
1.) at idle, turn on driver seat heater. Seat heats up no problem. Seat controls work
2.) begin to drive. Seat heater shuts off within seconds. Restraint system warning Messages come back on Idrive. Seat control stop working. #101 Fuse is popped again.
3.) park car, test seat heater. Works fine (idrive messages and Inop seat unchanged)

Seems we have a short somewhere resulting from change in voltage that may be occurring when driving the car since this does not happen at idle. . Suggestions on what parts to check?

Codes after above failures:

Advanced Crash and Safety Management (ACSM):
- Fault: Driver s seat modules
- Code: 0093C6
<===========================>

Junction Box Passenger / Beifahrer:
- Fault: heated seats driver
- Code: 00A6E0

Seats / Sitze:
- Fault: fast heater fault
- Code: 009E5F
<--------------------------->
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2008 E70 X5 3.0si

Last edited by PHL08; 03-12-2017 at 09:19 AM.
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Old 03-12-2017, 09:42 AM
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My guess is the short is somewhere in the seat harness.
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