Checking the control unit for a short circuit

Measure the resistance between 2 and earth when the relay driver is active.

The resistance will be high when the relay driver is active.

If the resistance is low, replace control unit.

Additional information: 

• To access the relay/fuse box in the boot, see Integrated relay/fusebox cargo compartment/Rear electronic module (REM), replacing .

Fig 1: Identifying Ohm Meter

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Verification