Electrical Diagrams

px1SRS (Air Bag):

WIRING DIAGRAM



COMPONENT LOCATION VIEW



COMPONENT ID
22a Main fuse board behind the access panel in the glove box.
47t Airbag warning lamp in pictogram 213.
159 Distribution terminal (+15 circuit), in main fuse box behind the glove box.
213 Pictogram, in the main instrument display panel.
236D Driver seat-belt tensioner, at the bottom of the B pillar on the driver's side.
236P Passenger seat-belt tensioner, at the bottom of the B pillar on the passenger's side.
331 SRS control module, in front part of the centre console under the dashboard.
333D Airbag, driver, in the steering wheel.
333BP Airbag, passenger, in the dashboard.
335 (H2-52) Orange short-circuiting connector, adjacent to the steering wheel.
336 Slip ring contact (coil spring), airbag, on the steering column below the steering wheel.
445 (H15-1) Diagnostics test socket, below the steering wheel.

2-Pin Connector
H2-72 Short-circuiting connector for passenger airbag.

Grounding Points
G20 Grounding point, SRS, adjacent to the electronic unit.

DESCRIPTION OF OPERATION
Cars equipped with an airbag are marked Supplementary Restraint System (SRS) on the steering wheel pad.

The system consists of a control module, seat-belt tensioners, steering wheel centre pad (airbag module) and passenger module, both with gas generator and airbag.

Airbag Control Module 331
The control module contains a microprocessor, electromechanical safety sensor, acceleration sensor and capacitors. Mounting of the unit is direction-dependent.

Airbag 333D
The steering wheel centre pad contains a gas generator and an airbag.

Airbag 333P
The passenger airbag is fitted where the glove box would otherwise be. It contains a gas generator and airbag.

Gas Generator
The gas generator consists of a central chamber and two annular chambers. The centre chamber contains an electric detonator and an explosive charge, which is in communication with the inner annular chamber.

Seat-belt Tensioners 236D And 236P
The seat-belt tensioners tension the two front seat-belts when the system is activated.

SAS Warning Lamp 47t
If a fault occurs in the system, warning lamp 47t will be grounded via the control module.

Power Supply
The control module is supplied with current via fuse 4.

Activation Of The Airbags And Seat-belt Tensioners
For the airbags and seat-belt tensioners to be activated, the sensors in the control module must sense the retardation.

Grounding
No grounding cables from other systems must be connected to the control module retaining bolts as operation of the system could be affected and a fault indication received from the diagnostic unit.

FAULT DIAGNOSIS HINTS
Before starting fault diagnosis, the following points must always be carried out:
^ Read through the safety and handling instructions.
^ Unplug the connectors on the back of the driver and passenger airbags.
^ Connect reference resistor 84 71 153 to each connector.

IMPORTANT: Defective SRS components must not be repaired. Always discard them and fit new components. SRS cables must not be spliced.