Passenger fire alarm activated by a discrete input.
- Check carefully for genuine fire in the vehicle - Check the fuse for the fire alarm circuit and reset or replace if necessary - Check the integrity of the fire alarm sensor - Check the connection of the fire alarm sensor to the harness - Check the integrity of the harness between the sensor and the BCI system - Check the activation signal for passenger fire alarm with BICT to analyze what triggered the alarm
What you'll see
No driver-visible symptom recorded.
System reaction
The fire alarm is issued in the instrument cluster
Diagnostic depth
The DTC is set active if it is detected that the discrete IO is not at the battery voltage.
- Fire - in the event of a real fire, the sensor may be destroyed and a genuine fire event will occur - Broken/tripped fuse for the fire alarm circuit - when the fuse is broken the discrete IO may not be at its usual state - Broken sensor input - the sensor may become damaged, for example during maintenance work in the vehicle - Disconnected sensor input - if the sensor is not connected, the default behaviour may be for the fire alarm to be issued - Broken harness between the fire sensor and the BCI system Note that it is customer configuration in UF518 BICT that determines how the discrete IO triggers the fire alarm warning. There may be additional inputs leading to the trigger of the fire alarm in the event of a custom configuration