BMW 1989-1995 525i Service Manual page 439

A IRBAG SYSTEM (SRS)
721-5
7. Installation is reverse of removal. noting the following:
• Coat horn slip ring (electrical contact ring) with CRC ' - ' "
copper paste before installing steering whee l
- When installing contact ring lock. make sure lock
spring engages pins on lock and lock cover
· Special instructions apply when installing airbag
equipped steering wheel. See 320 Steering and
Wheel Ali gnment.
• Airbag I
• Route wiring lead for horn through square open ing in
steering wheel
- When installing a new contact ring from BMW. remove
locking screw after installing the contact ring to steer -
ing whee l. See Fig. 10.
- Lock contact ring mounting nuts in place using lacquer
paint or varnish
0011902
Fig. 10. Airbag
I
con tact ring locking screw (arrow). as installed on
new replacement part from BMW.
• Airbag II
· Connect groun d lead at contact ring
- When installing a new contact ring from BMW. remove
locking pin after installing contact ring to steering wheel.
See Fig. 11.
0011906
Fig. 11. Airbag II contact ring locking pin (arrow s), as Installed on new
replacement part from BMW. Contact ring mounting screws
shown at A .
Airbag crash sensor, replacing
(Airbag I)
The Airbag I system uses two crash sensors mounted in the
engine com partment on the left and right wheel arches. The
sensors are identified by their orange color .
1. Disconnect negative (-) battery cable and cover nega -
tive terminal with an insulating material.
2. Remove lower steering column trim mounting screws
and remove the lower trim. Remove orange SRS con-
nector from its holder and carefully separate connector.
3. Working in engine compartment. remove anti-tamper
Torx screws from crash sensor. Remove sensor and
disconnect harness connect or. See Fig. 12.
001 1905
Fig. 12. Airbag crash sensor mount ing screws (arrow s) on cars WIth
Airbag I. Note Torx screws with ann-tamper pin in screw.
4. Installation is reverse of removal. Make sure arrow on
sensor faces forward when installing sensor.
WARNING -
Once the a;rbag unit is installed and all other se r-
vice procedures have been completed. start the en-
gine and check that the SRS warning tight goes out.
f(
tile warn ing light stays on. the SRS system will not
function as designed. Have the system diagnosed
and repaired by an au thorized BMW deater.
Tig htening Torque
• Airbag cras h sensor to
sensor mounting (Airbag I) 10 Nm (89 in-Ib)
AIRBAG I. AIRBAG /I