E2031 Rear fog lamp

Description

The car is equipped with extra bright tail-lights (rear fog lamps) located in the centre (on the boot) of the tail-light unit for use in cases of poor visibility.

The rear foglamps are activated by a button on the central console between the seats; the specific symbol is lit up when the side lights are on.

A warning light in the panel (rev counter module) signals that the rear fog lamps have been switched on.

The rear foglamps are enabled when the dipped beams are on, or when the fog lamps are on.

This control logic is managed by the check device located inside the rev counter module.

The correct operation of the rear fog lamps is controlled by the same check device as for the exterior lights, located inside the rev counter module.

The following faults may occur:

• blown bulb
• bulb s.c. to earth or positive
• incorrect bulb (5W bulb instead of 21W)

A special failure warning light, also in the rev counter module, comes on for all other faults in the various circuits. This warning light comes on for about 4 seconds when the ignition key is turned to MAR, to indicate it is working properly, then it goes off.

The rear fog lamps circuit is protected by two fuses for the lights monitored by the check system, one for the lights on the right hand side, the other for those on the left.

Description of operation

The switch H35 sends the signal for activating the rear fog lamps to the check device inside the rev counter E15 (pin 1 of connector B).

The supply for the check device inside E15 arrives directly from the battery (maxifuse J/B2 of B5 up to 2/99 or of B99 from 2/99.) to pins 10 and 16 of connector A, via fuses F2 and F3 of junction unit B1; The former protects the left hand lighting circuits, the latter protects the right hand circuits.

The check device only controls (pin 4 and pin 17 of connector A) the supply of the rear fog lamps in the centre rear light clusters on the left F35 and the right F36 if one of the two go ahead signals arrives from the dipped beam headlamps or the front ghts.

The first signal arrives from the dipped beam headlamps circuit at pin 8 of connector A ( Wiring diagram E2011 DIPPED HEADLAMPS ).

The second signal is supplied by the circuit inside the module E15: it is the same signal which lights up the "front fog lights on" warning light.

At the same time as the lights are switched on, the "rear fog lamps on" warning light - inside E15 - is also switched on with pin 14 of connector A providing the earth.

In the case of failures in the circuit, the "lights failure" warning light - inside E15 - comes on, with the supply controlled by the ignition (IINT), pin 15 of connector A, of the line protected by fuse B11 up to 2/99 or by fuse F4 of the additional fuse box B98B from 2/99.

The switch H35 is lit up when the side lights are switched on by means of the line coming from the switch for the steering column switch unit H5.

Wiring diagram

Components

Component location