Rear fog light: Diagnosis
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 detects the unbalance and sends error information to the bus. SID generates an acoustic signal and displays FOG LIGHT FAILURE.
DTC B1145 is activated when there is an open/short circuit on pin 25 to ground, or a short circuit to B+.
DTCs are not generated if the voltage is below 11V or during diagnostic communication.
IMPORTANT:
When changing a bulb, use one with the right output otherwise the components could be damaged.