Checking for open-circuits and short-circuits

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 a short-circuit to ground. Check for an open-circuit. Check for a short-circuit to supply voltage.

Check the wiring from the fuse in the passenger compartment to siren connector terminal #1. Check for an open-circuit. Check for a short-circuit to ground.

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, see Siren, replacing
• For further information about the fuses and relays, see the appropriate Wiring Diagram
• See Checking wiring and terminals .

Remedy as necessary.

Fig 1: Identifying Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohm Meter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Fuse Holder (Passenger Compartment)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected? 

• YES 

  Refer to Verification 

• NO 

  Refer to Replacing the component