Removal and installation of airbag unit on steering wheel - ra91001400660x(0660)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Model 140

Operation No. of Operation Texts and Work Units, Standard

Texts and Flat Rates 91-2157

Fig 1: Identifying Airbag Unit On Steering Wheel Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

AIRBAG UNIT ON STEERING WHEEL REMOVAL

Ignition key	turn to "0" position.
Negative battery terminal	unclip and mask.
Floor mat in front passenger's foot space	remove.
Foot rest	unscrew and remove.
Red (X11/13) airbag test coupling/plug connector	disconnect.
Both screws (arrow)	unscrew with Intorx screwdriver bit while holding the airbag unit.

Airbag unit	lift from steering wheel.
Plug connector	detach from the ignition capsule on the gas generator.
	NOTE: After detachment, a short-circuiting bridge in the plug connector on the gas generator automatically becomes effective.
Airbag unit	remove from steering wheel.

NOTE: No further work may be carried out on the entire airbag unit, which must be stored under personal supervision, and, for lengthy periods, under lock and key.

After dismantling, the airbag unit should always be stored with the cushioned side uppermost.

Special Tool

Fig 2: Identifying Special Tool (126 589 00 10 00 46)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

TIGHTENING TORQUE

Intorx fillister-head screw

6 Nm

Installation Note

Only the complete airbag unit is considered to be a spare part.

The airbag unit must not be treated with grease, cleaning or similar agents.
The airbag unit must not be exposed to temperatures in excess of 100°C, even temporarily.
The airbag unit is highly sensitive to shocks. If it is dropped from a height in excess of 50 cm onto a hard surface, it may no longer be installed. Instead it should be returned to the Sindelfingen factory in special transport packing.
Before installing the airbag unit, check that the earth cable has been disconnected from the battery, the terminal connected and the key set to position "0".

INSTALLATION NOTE

Plug connector	attach to the ignition capsule on the gas generator (connector must engage audibly).
Airbag unit	mount onto steering wheel.
Both Intorx screws	screw down with Introx screwdriver bit, tightening to 6 Nm.
Red airbag test coupling/plug connector (X11/13)	connect.
Negative battery terminal	connect.
Ignition	switch on.

NOTE: The "SRS" warning light must go out after 4 secs.

Observe warning light when engine is running and steering wheel is turned to full lock in both directions. The light should not light up or flicker.

Test horns for operation and automatic reset of combination switch.