Circuit Test

The fault is caused by an open circuit in one of the relay circuits or in the lock unit. To find out which circuit contains the fault:

Disconnect the lock unit connector.

Check the contacts for contact resistance and oxidation as described in Contact resistance and oxidation .

Check resistance between 4 and 6 on cable connector.

Additional information 

• To access/replace the lock unit, see Lock mechanism rear side door, replacing .

Fig 1: Identifying Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

The ohmmeter should display 0 ohm. 

• OK 

  Refer to Checking components 

• NOT OK 

  Refer to Circuit test, continued