Intermittent fault
Check the connectors for the upper electronic module (UEM) and the siren. Check for contact resistance and oxidation. Check for loose connections.
Check that the fuses in the fusebox in the passenger compartment are intact.
Check the cable between control module terminal #21 and siren terminal #2. Check for an intermittent short-circuit to ground. Check for an intermittent open-circuit. Check for an intermittent short-circuit to supply voltage.
Check the cable between ground terminal 31/94 and siren connector terminal #3. Check for an intermittent open-circuit.
Check the cable between the fuse in the fusebox in the passenger compartment and siren connector terminal #1. Check for an intermittent open-circuit. Check for an intermittent short-circuit to ground.
Try replacing the siren if no fault is found.
Other information:
- For further information about signals and other values, see Signal specification
- To connect the breakout box, see Connecting the breakout box
- To access the siren connector and to replace the siren, see Siren, replacing
- See Checking wiring and terminals .
- Continue
Refer to Information