Checking the 30-supply (valves) to the control module

Check the voltage between breakout box terminals #16 and #32 and between terminals #32 and #46. The voltmeter should read battery voltage.

Check that the fuse for the circuit is intact if the voltage is incorrect.

If the fuse is blown, check the cable between brake control module terminal #32 (#A32) and the fuse. Check for a short-circuit to ground.

If the fuse is intact, check the cable between brake control module terminal #32 (#A32) and the fuse. Check for an open-circuit.

Remedy as necessary.

Fig 2: Breakout Box

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Voltage Display

Courtesy of VOLVO CARS OF NORTH AMERICA.