Checking Components And Wiring

Check the power supply cable. Check for a short-circuit to supply voltage.

Take readings between:

• Engine Control Module (ECM) #B3 (#C3) and system relay.

Try a new system relay if no fault is found during the above fault-tracing.

Remedy as necessary.

Other information 

• see CONNECTING THE BREAKOUT BOX
• see SIGNAL SPECIFICATION
• see CHECKING WIRING AND TERMINALS

Fig 1: Identifying Main Relay

Courtesy of VOLVO CARS CORPORATION

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  Refer to INFORMATION