BMW fault code 9400
Crash safety module
In the crash safety module, code 9400 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: Incorrect installation, seat-occupancy mat
Module versions: Multiple restraint system (MRS5), Multiple restraint system (MRS7)
In: 1 Series (E87) 2004–2011, 1 Series (E81) 2007–2011, 1 Series (E82) 2007–2013, 3 Series (E90) 2005–2012, 3 Series (E91) 2005–2012, 3 Series (E92) 2006–2013, X1 (E84) 2009–2015, Z4 (E89) 2009–2016
ACSM: Seat-occupancy detector, passenger: incorrect type installed
Module version: Crash safety module (ACSM2)
In: 1 Series (E82) 2007–2013, 1 Series (E88) 2008–2013, 3 Series (E92) 2006–2013, 3 Series (E93) 2007–2013, X1 (E84) 2009–2015, X5 (E70) 2006–2013, X6 (E71) 2008–2014, X6 (E72) 2009–2011
ACSM: Seat-occupancy detector, passenger: incorrect type
Module version: Crash safety module (ACSM85)
SIM: Front sensor, right: wrong component
Module version: Safety and Information Module (SIM85)
Reading and clearing it
Fault code 9400 is a BMW code, stored in the car's crash safety module, 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 crash safety module is on: 5 Series (E60), 5 Series (E61), 6 Series (E63), 6 Series (E64), 7 Series (E65), 7 Series (E66), 7 Series (E67), X5 (E70), X6 (E71), X6 (E72), 1 Series (E81), 1 Series (E82), X1 (E84), Z4 (E85), Z4 (E86), 1 Series (E87), 1 Series (E88), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
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