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 ACCESSORY ELECTRONIC MODULE (AEM), REPLACING
• 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 CHECKING WIRING AND TERMINALS

Fig 1: Accessory Electronic Module Ground Terminals

Courtesy of VOLVO CARS CORPORATION

Fig 2: Identifying Ohm Meter

Courtesy of VOLVO CARS CORPORATION

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  Refer to VERIFICATION