Checking For An Open-Circuit Between the Control Module And the Relay

• Remove relay 2/17.

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. For further information about open-circuits.

HINT: The voltage between terminals #1 and #2 should be battery voltage. If the value deviates markedly, check the voltage between terminal #2 and the battery and between terminal #1 and ground. Both must be the same as the battery voltage. 

Also check the signal loop between relay terminal #2 (2/17) and central electronic module (CEM) terminal #19A. Check for an open-circuit.

Other information: 

• See Checking Wiring And Terminals .

Fig 1: Identifying Ohmmeter

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