Checking components and wiring

Check the signal cable for the relay for the electric engine block heater. Check between accessory control module terminal #B5 and the connector for the relay. Check for a short-circuit to supply voltage. Check for an open-circuit.

Check the ground lead for the relay for the electric engine block heater. Check between accessory control module terminal #B4 and the connector for the relay. Check for an open-circuit.

Remedy as necessary.

Other information: 

• To connect the breakout box, see Connecting the breakout box. Accessory electronic module
• To access or replace the Accessory Electronic Module (AEM) and connector, see Replacing the accessory electronic module
• For information about signals, see Signal description. Accessory electronic module (AEM)
• To access and replace the relay for the electric engine block heater, see Relay electrical engine block heater, replacing
• To fault-trace wiring and terminals see Contents

Fig 1: Identifying Accessory Electronic Module Ground Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Verification