Checking Component And Wiring

Check the central electronic module (CEM) connector terminal #C3. Check the horn switch connector. Check for contact resistance. Check for oxidation. Check for damage. Check for loose connections. Also check the intermediate connector.

Check signal cable for a short-circuit to ground.

Take readings between:

• Central electronic module (CEM) connector terminal #B26 and steering wheel module (SWM) connector terminal #A2
• Steering wheel module (SWM) connector terminal #B2 and horn switch.

Remedy as necessary.

Other information 

• see CONNECTING THE BREAKOUT BOX (2004, 2005, 2006, 2007)
• see SIGNAL DESCRIPTION CENTRAL ELECTRONIC MODULE (CEM) (2004, 2005, 2006, 2007)
• see CONTROL MODULE RELAY BOX PASSENGER COMPARTMENT
• see CHECKING WIRING AND TERMINALS

Fig 2: Identifying 20-Bit Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying Horn Switch

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to VERIFICATION