Cab Electrical and Electronic Components
Pass-Through Bulkhead Connector
The pass-through bulkhead connector is where the interior dash harness connects to the exterior chassis harness. This provides a disconnect point for harness service, testing, and replacement. It is located on the driver-side front wall of the truck. See Fig..
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Vehicle Power Distribution Module (VPDM)
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Electronics Bay
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VPDM Ground
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Battery Cable Access (BCA) Front Wall Pass-Through
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VPDM Power
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sSAM Ground
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sSAM Power
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Single System and Actuation Module (sSAM)
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Front Wall Cab Ground Pass-Through Stud
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Front Wall Interior Ground Stud
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Pass-Through Bulkhead Connector
Fig. 1, Cab Power Distribution and Component Location Overview
Single System and Actuation Module (sSAM)
The sSAM is the primary module in the electrical system, combining chassis power distribution, cab power distribution, and modular switch functions into a single ECU. The sSAM does not contain fuses or relays.
The sSAM reads input information from sensors, switches, and databus messages, and drives output and controller area network (CAN) messages. The sSAM is located near the center of the cab behind the lower dash panel. See Fig..
Electronics Bay
The electronics bay contains the electronic control units that control different vehicle features. It is located on the passenger-side of the cab behind the dash panel. See Fig. for its location in the cab and Fig. for the location of ECUs in the bay.
Note: This figure shows almost all slots filled. In a typical vehicle, more electronics bay slots would be free.
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Truck Data Connect Antenna
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Chassis CAN Starpoint Connector
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Common Telematics Platform
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Expansion Module
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Expansion Module
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Electronically Controlled Air Suspension (ECAS) ECU
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Integrative Predicative Powertrain Control (IPPC) Module
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Common Powertrain Controller ECU
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Antilock Braking System (ABS) ECU
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Cabin CAN Starpoint Connector
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Central Gateway
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Video Radar Decision Unit (VRDU) ECU
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Expansion Module
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Powertrain CAN Starpoint Connector