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BMW E46 Airbag Control Module (MRS) Wiring Description

A12 - Multiple restraint system
X74 - Yellow or Grey 50 pin
1998/03 to 1999/09 MRS-II, Yellow connector single stage front airbags
after 1999/09 MRS-III/IV grey connector 2-stage front airbags

Functions on X74, 50-pin Dual Row Connector
Wire Size/Color
Function
Pin
Pin
Function
Wire Size/Color
0.5 GE/RT GSF+ Driver's seat belt tensioner +
1
26
MRS-II Not used
MRS-III/IV ABF2+ Driver's airbag inflator stage 2 +
0.5 GR/SW
0.5 GE/BR GSF-- Driver's seat belt tensioner -
2
27
MRS-II Not used
MRS-III/IV ABF2-- Driver's airbag inflator stage 2 -
0.5 GR/BR
0.5 BL/RT GSBF+ Passenger's seat belt tensioner +
3
28
Not used
0.5 BL/BR GSBF+ Passenger's belt tensioner -
4
29
Not used
0.5 VI/BL R<11 Fuse 11, Terminal R
5
30
Not used
0.5 BR/SW 31E/AB Ground
6
31
KEY
0.35 BR/VI AWL Instrument cluster airbag warning LED
7
32
KEY
0.35 BL/VI/GE USD_LHD GKBF Passenger seat belt buckle sensor
not USD_LHD not used
8
33
MRS-II Not used
MRS-III/IV ABBF2+ Passenger front airbag inflator stage 2+
0.5 WS/SW
0.35 WS/RT/GE K--BUS K-Bus
9
34
MRS-II Crash output to general module
MRS-III/IV Not used
0.5 GE/SW ABF+ Driver's airbag inflator stage 1 +
10
35
Not used
0.5 GE/BR ABF-- Driver's airbag inflator stage 1 -
11
36
Not used
0.35 BL/WS GKF Driver's seat belt buckle sensor
12
37
Not used
0.5 BL/SW ABBF+ Passenger airbag inflator stage 1 +
13
38
Not used
0.5 BL/BR ABBF-- Passenger airbag inflator stage 1 -
14
39
Not used
0.5 WS/RT SBE Passenger seat occupancy sensor
15
40
MRS-II Not used
MRS-III/IV ABBF2-- Passenger front airbag inflator stage 2 -
0.5 WS/BR
0.5 GE SAVL+ Front passenger door airbag inflator +
16
41
Not used
0.5 BR SAVL-- Front passenger door airbag inflator -
17
42
Not used
0.5 BL SAVR+ Front driver's door airbag inflator +
18
43
NO PIN
0.5 BR SAVR-- Front driver's door airbag inflator -
19
44
NO PIN
0.35 GE/GN SACSL Impact sensor left side
20
45
ITSAL+ Driver's head airbag inflator + 0.5 GE
0.35 GE/RT SACSR Impact sensor right side
21
46
ITSAL-- Driver's head airbag inflator - 0.5 BL/GE
0.5 GN SAHL+ Rear left side airbag inflator +
22
47
ITSAR+ Passenger's head airbag inflator + 0.5 WS
0.5 BL/GN SAHL-- Rear left side airbag inflator -
23
48
ITSAR-- Passenger's head airbag inflator - 0.5 BL/WS
0.5 RT SAHR+ Rear right side airbag inflator +
24
49
BPT+ Battery safety terminal + 0.5 BL
0.5 BL/RT SAHR-- Rear right side airbag inflator -
25
50
BPT-- Battery safety terminal - 0.5 BR

Terminal R - +12V in Acc, On and Start
Terminal 15 - +12V in On and Start
Terminal 30 - +12V Constant power

Color Code
Color
SW
Black
BR
Brown
RT
Red
GE
Yellow
GN
Green
BL
Blue
VI
Violet
GR
Gray
WS
White

Wire Size (mm2) AWG equivalent
0.35 20
0.50 18
0.75 16-17
1.0 15-16
2.5