Checking The Key Sensor Signal

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS CORPORATION

• Ignition off.

  Check the voltage in the central electronic module (CEM) connector, terminal #B1 (#A21). The voltage must be battery voltage.

  Remove the key from the ignition switch. The voltage must now be approximately 0 V.

  Other information 

  • To access or replace the central electronic module (CEM) connector, see CENTRAL ELECTRONIC MODULE (CEM), REPLACING
  • To connect the breakout box to the control module, see CONNECTING THE BREAKOUT BOX
  • For further information about signals and other values, see SIGNAL SPECIFICATION
  Fig 2: Identifying Voltage Display

  Courtesy of VOLVO CARS CORPORATION
  Fig 3: Identifying Central Electronic Module (CEM) Connector Terminals

  Courtesy of VOLVO CARS CORPORATION

Is the voltage OK? 

• YES 

  FAULT NOT FOUND:  Troubleshooting has been completed.

• NO 

  Refer to CHECKING THE IGNITION SWITCH