【文章內容簡介】 microprocessor is used to control a large amount of current. Copyright 169。 2020 Delmar, Cengage Learning Body Controller Headlight Circuit Figure 1315 Body controller headlamp circuit. EGC contains headlamp switch. Copyright 169。 2020 Delmar, Cengage Learning TurnSignal System, International Truck With Body Controller Figure 1316 Turnsignal system on International trucks with body controller. Two switches are inputs。 four high side drivers are outputs. Copyright 169。 2020 Delmar, Cengage Learning Tech Tip The body controller only powers the applicable trailer light relay control circuit. The body controller does not directly supply the current to the trailer lighting. A conventional CPD such as a fuse or a circuit breaker in the PDC is used to protect the trailer wiring, not virtual fusing. Copyright 169。 2020 Delmar, Cengage Learning A/C System Inputs。 Outputs Is A/C Clutch High Side Driver Figure 1317 Air conditioning system inputs。 output is A/C clutch high side driver. Copyright 169。 2020 Delmar, Cengage Learning Cruise Control Related Inputs Output is J1939 Message to Engine ECM Figure 1318 Cruise control related inputs。 output is J1939 message to engine ECM. Copyright 169。 2020 Delmar, Cengage Learning Primary and Secondary Air Pressure Measurement System Figure 1319 Primary and secondary air pressure measurement system. Copyright 169。 2020 Delmar, Cengage Learning Windshield Wiper System Outputs Figure 1320 Windshield wiper system outputs。 one high side driver and two low side drivers. Copyright 169。 2020 Delmar, Cengage Learning Wiper Switch Inputs and Truth Table Figure 1321 Wiper switch inputs and truth table. Copyright 169。 2020 Delmar, Cengage Learning Tech Tip An open windshield wiper switch connection on an International truck with a body controller causes the wiper to operate at high speeds at any time the key switch is in the ignition position. Additionally, a short to ground of the windshield washer pump control circuit will cause the windshield wipers to operate at low speed any time the key switch is in the ignition position because the controller is falsely detecting that the washer switch is depressed. Copyright 169。 2020 Delmar, Cengage Learning Freightliner Multiplexed Electrical System ? Freightliner refers to their multiplexed electrical system as SmartPlex? ? The bulkhead module (BHM) acts as the primary mand module for body and chassis electrical systems. ? The chassis module (CHM) is the other standard electronic module ? The CHM is a slave or dependent that receives mands from the BHM Copyright 169。 2020 Delmar, Cengage Learning Freightliner SmartPlexTM Electronic Module Locations Figure 1322 Freightliner SmartPlexTM electronic module locations. Copyright 169。 2020 Delmar, Cengage Learning Bulkhead Module (BHM) ? Main electronic controller for Freightliner SmartPlexTM electrical system ? The BHM is connected to the J1939 data link and transmits and receives information from other electronic modules ? The