2892491 - E2020 DIRECTION INDICATORS / HAZARD WARNING LIGHTS - Functional description

Functional description

The circuit is controlled by the switch control unit H90 .

The intermittent device is located on the steering column switch unit H5. It is connected to earth to pin 7 of connector A and receives a supply signal to pin 7 of connector D through switch H90 itself, when:

• the hazard lights are not on, the supply is controlled by the ignition (INT) through the line for fuse F1 of the junction unit B1 .
• the hazard lights are on, the supply is direct from the battery through the line for maxifuse J/B1 of B5 and fuse F9 of junction unit B1 .

The intermittent device therefore produces a signal which supplies both the switch for the direction indicators on the steering column switch unit H5 and the switch for the hazard warning lights H90 . The operation, in one direction or another, of the steering column switch lever H5 supplies the right direction indicators ( F11 , F21 , F31 ) or the left ones ( F10 , F20 , F30 ). At the same time, the warning light, located in the instrument panel E50 , comes on. By pressing the switch in the control panel H90 three contacts which simultaneously supply all the lights (right branch and left branch) close and the red LED in the actual switch which lights up the ideogram. There is also a special LED in the switch H90 which comes on when the ignition is switched on (INT/A) and is protected by fuse B27 . Versions with alarm: all the hazard warning lights are also operated by the alarm system control unit M30 (pins 1 and 2 of connector B), which is connected directly to the light power supply (  See E7015  ALARM ). Versions without alarm: all the hazard warning light are activated by the relay J43 which receives a direct supply from the battery, via the line for maxifuse J/B1 of B5 and fuse F9 of the junction unit B1 : the relay is energized by a signal coming from the receiver for the remote control M35 , pin 1. All the hazard warning lights are also operated by the alarm system control unit M30 (pins 1 and 2 of connector B), which is connected directly to the light power supply (  See E7015  ALARM ). Connection for towing a trailer: by replacing the intermittent device with a double device, this also produces an output signal - pin R - which supplies the warning light in the on board instrument E50 - pin 16 of connector C - which signals that the trailer direction indicators have been switched on.