Dipped Beam

Dipped Beam

Dipped beam is on when the light switch is in position 2 and the ignition is in position OFF, ON or START. When the ignition is on, the power supply to the dipped beam lamps is controlled by DICE. Dipped beam is used as daylight driving lights on certain markets (light switch in position 0 or 1).

From terminal 11 on the light switch (10), +X voltage is supplied from the ignition switch pin 15 to the control module and the main light relay is grounded via pin 4 of the control module, operating the relay. +30 voltage is fed through the relay via the filament monitor and on to:
^ fuse 7 and RH dipped beam
^ fuse 9 and LH dipped beam

A safety circuit in the lighting system ensure that the dipped beam can always be turned on if the DICE control module should malfunction (Limp home).

When the light switch is in position 2, the +X voltage can also be used to power the dipped beam lamps. +X is fed to the dipped beam relay, which is closed, and the voltage is fed directly through the relay via the filament monitor and fuses to the dipped beam lamps. The dipped beam is somewhat dimmer, however, due to a voltage drop in the circuit.

Filament monitor
The filament monitor is located in the engine bay (relay box). It detects any breaks in the circuit to the dipped beam lamps by measuring the current in the circuit. In the event of an open circuit, the filament monitor pin 9 grounds pin 23 of the SID unit. SID displays the message "Front light failure."








Follow Me Home

"Follow me home" is a programmable function in DICE. It keeps the dipped beam on for 30 seconds after the car key has been removed from the ignition switch and the driver's door has been closed.

The function is activated by taking the car key out of the ignition switch, opening the driver's door and pulling the dipswitch to its rear position (position for switching between main and dipped beams). After closing the driver's door (must be done within 30 seconds), the dipped beam will stay on for 30 seconds and then go out. The length of time the lights stay on is programmable.

DICE detects that +B is not fed to pin 7:
^ When the car key is not in the ignition switch.
^ The control module detects when the driver's door is opened by reading information on the bus from TWICE.
^ When the dipswitch is activated, power is supplied to pin 41 of the control module.
^ The control module detects when the driver's door is then closed by reading information on the bus. This grounds the dipped beam relay via pin 4 of the control module for 30 seconds, lighting the dipped beam lamps.