Checking the Power Supply, Brake Control Module

Checking the power supply, brake control module

Checking the 15-supply to the control module








- 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) Connecting the Breakout Box
- For further information about the fuses and relays, see the Wiring Diagram.









Was a fault detected?

Yes - FAULT FOUND

No - Checking the 30-supply (valves) to the control module

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




- The breakout box connected
- Ignition on.
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.









Was a fault detected?

Yes - FAULT FOUND

No - No Fault Found

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