PRETENSIONERS - DESCRIPTION

1.2 8v, 1.6 16v, 1.3 JTD 16V, 1.9 JTD 8V, 1.9 DIESEL

Description

To make the protective action of the front seat belts more effective, the vehicle is fitted with pretensioners.

In the case of an impact, these devices make it possible to:

• firstly, improve the adherence of the seat belts to the body of the occupants;
• later, retain the actual body.

It is possible to tell that the pretensioner has been activated because the reel locks; the belt will remain locked.

The two front pretensioners are operated by an electronic control unit which is protected by a fuse located inside the junction unit under the dashboard.

A fixed warning light in the instrument panel (the same one as the Air Bag failure) signals if the pretensioners are faulty.

Functional description

The operation of the pretensioner system is managed by the pretensioner control unit M61. The supply is controlled by the ignition (INT) at pin 6 via the line leaving pin 6 of connector E of the junction unit under the dashboard B02. This line enters the control unit at pin 11 connector E and is protected internally by fuse F50.

The pretensioners control unit is earthed at pin 5.

When a frontal impact of a certain severity (depending on the software setting) is detected, the control unit sends control signals for the operation of the following modules:

• driver's side pretensioner Q20 (from pins 7 and 8);
• passenger side pretensioner Q21 (from pins 9 and 10).

It also communicates from pin 11 with the instrument panel E50 (pin 13 connector B) for lighting up the warning light in the case of an impact or fault.

The supply for the body computer M01 is both controlled by the ignition and direct to pin 11 of connector E (INT) and pin A of connector C of the junction unit under the dashboard B02.

There is a protective fuse F1 for the direct supply located in the engine compartment junction unit B01.

These lines also supply the instrument panel and split inside the junction unit under the dashboard B02 (MAXIFUSE). The lines are protected by fuses F37 and F53.

Pins 8 and 9 connector D of the body computer M01 are connected to earth. This reference signal is also supplied to the panel via pin 36 of the body computer.

Wiring diagram

COMPONENTS

Location of components

COMPONENTS