BMW fault code 0004
Multiple Restraint System
In the multiple restraint system, code 0004 means different things depending on the version of the module in the car. Find your car below; the app shows the right one for yours.
MRS: Airbag, passenger, stage 1
Module versions: Multiple Restraint System (MRS4), Multiple Restraint System (MRS4RD), Multiple Restraint System (MRS5K)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, 5 Series (E39) 1998–2003, X3 (E83) 2003–2010, X5 (E53) 1999–2006, Z8 (E52) 2000–2003
Resistance ZK2 -> passenger seat belt pretensioner
Module versions: Airbag (BAE), Airbag (ZAE)
In: 3 Series (E36) 1990–2000, 5 Series (E39) 1995–1998, 7 Series (E38) 1994–1998
MRS: Driver's airbag
Module version: Multiple Restraint System (MRS2)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, 5 Series (E39) 1995–2003, 7 Series (E38) 1994–2001, X5 (E53) 1999–2006, Z8 (E52) 2000–2003
MRS: Airbag, front passenger
Module version: Multiple Restraint System (MRS3)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, 5 Series (E39) 1998–2003, 7 Series (E38) 1998–2001, X5 (E53) 1999–2006, Z8 (E52) 2000–2003
ignition circuit 0 -> driver airbag
Module version: Airbag (ZAE2)
In: 3 Series (E36) 1990–2000, 5 Series (E39) 1995–1998, 7 Series (E38) 1994–1998
Reading and clearing it
Fault code 0004 is a BMW code, stored in the car's multiple restraint system, not a generic OBD2 code (P0xxx): a generic OBD2 reader only reaches the engine's emissions faults, so it won't show it. AutoLingo for BMW reads it with BMW's own diagnostic protocols, in plain English, with the details the module stored about it, and clears it after a repair. If a fault comes right back after it's cleared, the problem is still there.
The multiple restraint system is on: 3 Series (E30), Z1 (E30/Z1), 8 Series (E31), 7 Series (E32), 5 Series (E34), 3 Series (E36), Z3 (E36/7), 7 Series (E38), 5 Series (E39), 3 Series (E46), Z8 (E52), X5 (E53), X3 (E83)
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