The table below summarizes the input signals to and output signals from the Park Brake Module (PBM). The signal types are divided into directly connected signals and CAN communication. The illustration below displays the same information with the Volvo component designations.

Input signals	Output signals
Directly connected:	Directly connected:
Parking brake switch (3/272)	Electric motor right brake caliper (6/147) Electric motor left brake caliper (6/146)
Via Controller Area Network (CAN) communication:	Via Controller Area Network (CAN) communication:
Central electronic module (CEM) (4/56) Brake control module (BCM) (4/16) Engine control module (ECM) (4/46) Transmission Control Module (TCM) (4/28) Supplemental Restraint System Module (SRS) (4/9) Forward Sensing Module (FSM) (4/80) (applies to vehicles equipped with Forward Sensing Module (FSM))	Central electronic module (CEM) (4/56) Brake control module (BCM) (4/16) Driver information module (DIM) (5/1) Parking Assistance Module (PAM) (4/86) Forward Sensing Module (FSM) (4/80) (applies to vehicles equipped with Forward Sensing Module (FSM)) Engine control module (ECM) (4/46)

Fig 1: Identifying Input Signals And Output Signals From Park Brake Module (PBM)

Courtesy of VOLVO CARS CORPORATION

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

System Overview: Signals

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When to See a Mechanic

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