Checking The Wiring

Fig 1: Identifying Ignition In Off Position

Courtesy of VOLVO CARS CORPORATION

Fig 2: Disconnecting Connector

Courtesy of VOLVO CARS CORPORATION

• Ignition off
• Disconnect the start control module (SCU) connector.

  Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground.

  Take readings between:

  • Central electronic module (CEM) terminal #A30 (#30) and start control module (SCU) terminal #1
  • Central electronic module (CEM) terminal #A42 (#42) and start control module (SCU) terminal #2
  • Central electronic module (CEM) terminal #A17 (#17) and start control module (SCU) terminal #3.
  • Central Electronic Module (CEM) terminal #A15 (#15) and Start Control Unit (SCU) terminal #5.

  Check the fuse for the Start Control Unit (SCU).

  Remedy as necessary.

  Other information 

  • see CONNECTING THE BREAKOUT BOX, CENTRAL ELECTRONIC MODULE (CEM)
  • see SIGNAL DESCRIPTION CENTRAL ELECTRONIC MODULE (CEM)
  • see LOCATION OF COMPONENTS, CENTRAL ELECTRONIC MODULE (CEM)
  • see IGNITION LOCK
  • see CONTROL MODULE RELAY BOX PASSENGER COMPARTMENT
  • see CHECKING WIRING AND TERMINALS

Was a fault detected? 

• YES 

  Refer to VERIFICATION 

• NO 

  Refer to REPLACING THE START CONTROL UNIT (SCU)