Exterior Lighting
Exterior Lighting
The following lamp functions are included in the car's exterior lighting system:
- Main lighting
- Brake lights
- Reversing lights
- Front fog lights
- Rear fog light
- Direction indicators
- Hazard flashers
The main lighting is controlled by the light switch on the dashboard and the dipswitch by the steering wheel. The other lamps in the exterior lighting system are controlled by separate switches.
Main lighting
The main and dipped beams, rear lights, numberplate lighting, and parking lights are included in the main lighting. The light switch must be in position 2 and the ignition ON to operate the main lighting. The main and dipped beams are controlled by DICE via 2 relays. The parking lights are monitored by TWICE (like a filament monitor).
The functions of the light switch in the car are controlled by the control module DICE. There are 3 different program alternatives for DICE that can be selected to suit the car market destination.
On certain markets, the dipped beam is used as daylight driving lights. The light switch must then be in position 0.
The parking lights are on when the light switch is in position 1, if the ignition is OFF. Depending on the current program alternative, the parking lights can be on when the light switch is in another position. In certain markets, the dipped beam is used as daylight driving lights.
The main and dipped beam function is monitored by a filament monitor. In the event of a fault, SID (Saab Information Display) will produce an acoustic alarm signal and display FRONT LIGHT FAILURE.
The rear lights (LH and RH) are monitored by TWICE. In the event of a fault in the rear light function, SID will produce an acoustic alarm signal and display REAR LIGHT FAILURE.
Brake lights
The brake lights are located in the rear lights and in a high-level brake light. The light source in the high-level unit consists of a number of LEDs (Light Emitting Diodes). When the brake pedal is depressed, a switch in the brake light circuit closes and the brake lights go on.
The circuits to the brake lights are monitored by TWICE and an error message is sent to the bus if the current in the circuit drops below a certain value. In the event of a fault in the circuit, SID produces an acoustic alarm signal and displays BRAKE LIGHT FAILURE.
Reversing lights
The reversing lights are turned on by the reversing-light switch when reverse gear is engaged. DICE outputs the status of the reversing-light switch (ON/OFF) to the bus.
Front fog lights
The front fog lights (certain markets) are located in the spoiler and operated by a switch on the dashboard when the light switch is in the position 1 or 2 (depending on market). The function can be programmed.
Rear fog light
The rear fog light is on the right-hand side on right-hand drive cars or on the left-hand side on left-hand drive cars. The light is operated by a switch to the right of the light switch. The function is reset when the ignition is turned OFF. This means that the function must be reactivated next time the car is started.
The circuits to the rear fog light are monitored by DICE and an error message is sent to the bus if the current in the circuit drops below a certain value. In the event of a fault, SID produces an acoustic alarm signal and displays FOG LIGHT FAILURE.
Direction indicators
When the direction indicators are activated, DICE sends a message to SID to produce an acoustic signal and to MIU (main instrument unit) to display a lamp signal. The flashing frequency is 90 flashes per second. When a lamp has failed the flashing frequency is doubled to 180 flashes per second.
Hazard flashers
The hazard function turns on all the direction indicators with the hazard flasher switch. The flashing frequency is normally 90 flashes per second.
IMPORTANT: When changing a bulb, use one with the right output otherwise the components could be damaged.