Lamp check

WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

TWICE checks the circuits for the rear lights and brake lights.

Rear lights
TWICE acts as a filament monitor for the rear lights. On a break in a circuit, SID can read an error message on the bus sent out by TWICE. The message activates an information text on the display or an audible warning.

TWICE checks whether voltage is present at the rear light inputs; this information is available on the bus. The information is used by DICE.
Brake lights
TWICE acts as a filament monitor for the brake lights. On a break in a circuit, SID can read an error message on the bus sent out by TWICE. The message activates an information text on the display or an audible warning.

TWICE checks whether voltage is present at the brake light inputs; this information is available on the bus. The information is used by SID.