Checking the control module for open-circuits

• Remove the relay, 2/67 (2/87 5DRS).

  Check the driver circuit for the relay coil for an open-circuit as follows: activate the relay driver. Measure the voltage between terminals #1 and #2 on the relay base.

  HINT: The voltage between terminals #1 and #2 should be battery voltage. 

  HINT: If the value deviates excessively, check the voltage between terminal #2 and battery voltage and between terminal #1 and ground. Both should equal battery voltage. 

  HINT: Check for an open-circuit. 

  HINT: Do not forget to check that the power supply to the control module is OK. 

  Other information 

  • See Checking wiring and terminals .
  Fig 1: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 2: Identifying Relays And Terminals

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Was a fault detected? 

• YES 

  Refer to Verification 

• NO 

  Refer to Checking the control module for short-circuits