BMW 5251 Service Manual page 950

721 -2
l ~ i r b a ~ System (SRS)
This repair group covers airbag components and replace-
ment. Airbag system repairand fault diagnosis is not covered.
Diagnostics, component testing, and airbag system repair
should be carried out by trained BMW service technicians.
Individual airbag system components can only be tested elec-
tronically when installed in the car. BMW service testers DIS
or MoDiC or equivalent must be used for diagnostic work.
WARNING-
Special test equipment is required to retrieve airbag fault
codes, diagnose system faults, and reseffturn off the air-
bag indicator light. The indicator light will remain on until
any problem has been corrected and the fault memory has
been cleared.
Airbags are part of the BMW Multiple Restraint System
(MRS). Three versions of MRS are available in E39 models.
Multiple Restraint Systems
MRS and MRS II include the following restraint components:
311 996-811 997
911 997-311 999
311 999-2002
Driver and passenger front airbags (MRSIMRS II)
MRS
MRS
II
MRS
Ill
Passenger front two-stage airbag (cars manufactured
from 911998).
The seat occupancy sensor (SBE) is used for detection of
a passenger in the right front seat. MRS uses the SBE in-
put to determine seat belt tensioner and/or front airbag de-
ployment thresholds.
Side impact airbag for driver and front passenger
(MRSIMRS II)
Leftlright side impact crash sensors (MRSIMRS 1 1 )
Side impact airbag for rear passenger (MRS II) (optional)
Head Protection System (HPS) for driver and front passen-
ger (MRS II)
Battery Safety Terminal
-
BST (MRS II)
Hall Sensor seat belt switches (MRS II)
Front pyrotechnic seat belt tensioners
Fuel pump cut off message