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Checking The 15-Supply To The Control Module

Fig 1: Identifying Ignition ON

GLL101051

Courtesy of VOLVO CARS CORPORATION

Fig 2: Disconnecting Control Unit

GLL101002

Courtesy of VOLVO CARS CORPORATION

The breakout box connected
Control module disconnected.
Ignition on.
Check the 15-supply by measuring the voltage between terminal #4 (#A4) and ground terminals #16 (#A16) and #46 (#A46). 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 #4 (#A4) and the fuse. Check for a short-circuit to ground.

If the fuse is intact, check the cable between brake control module terminal #4 (#A4) and the fuse. Check for an open-circuit.

If no fault is found in the cable between brake control module terminal #4 (#A4) and the fuse, check the cable between the fuse and the ignition switch.

Other information
- To connect the breakout box, see CONNECTING THE BREAKOUT BOX, BRAKE CONTROL MODULE (BCM)
Fig 3: Breakout Box
Courtesy of VOLVO CARS CORPORATION

Fig 4: Identifying Voltage Display
Courtesy of VOLVO CARS CORPORATION

Was a fault detected?

YES
OKAY: Troubleshooting has been completed.
NO
see CHECKING THE 30-SUPPLY (VALVES) TO THE CONTROL MODULE