BMW fault code 940D
Crash safety module
In the crash safety module, code 940D 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.
No message (brightness LCD), receiver ACSM / MRS5, transmitter KOMBI
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
LCD brightness - telegram with brightness information not received
Module version: Crash safety module (ACSM85)
No message (brightness LCD) from instrument cluster, receiver ACSM/MRS5 , transmitter KOMBI
Module version: Multiple restraint system (MRS5)
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
MRS: No message (brightness) from instrument cluster
Module version: Multiple restraint system (MRS7)
In: Z4 (E89) 2009–2016
Reading and clearing it
Fault code 940D 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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