Đang tải... (xem toàn văn)
Hướng dẫn hệ thống điện đầu kéo Freightliner M2 EPA 2010
EPA 2010 M2 ElectricalBody Builder Reference GuideElectrical System Overview2010 M2 Electrical Body Builder Reference Title Page Rev NewEPA 2010 Models Electrical System Overview2010 M2 Electrical Body Builder Reference Page # 1 Rev NewEPA 2010 ModelsIndexPage 1 IndexPage 2 Electrical Component OverviewPage 3 Electrical Harness OverviewPage 4 Electrical Power flow OverviewPage 5 Page 6 Page 7 Page 8 Page 9 Bulk Head Module (BHM)Page 10 Bulk Head Module (BHM) Pin DetailPage 11 Chassis Module (CHM)Page 12 PNDB Power Net Distribution Box Positive Disconnect SwitchMain Power Distribution Module (PDM)PDM / VBAT Fuse CoverageChassis Module (CHM) Pin DetailPage 13 Multiplexing System BackbonePage 14 System Tap PointsPage 15 J1708 GatewayPage 16 Low Current Smart SwitchesPage 17 High Current Switches (Battery Hot)Page 18 High Current Switch (BH) SchematicsPage 19 High Current Switches (Ignition Interlocked)Page 20 High Current Switch (Ignition Interlocked) SchematicsPage 21 High Current Switch Label OptionsPage 22 Body Builder Lighting InterfacePage 23 Body Builder PDMPage 27 Trailer Electrical Schematics (Combination)PTO InstallationPage 36 PTO PTO ControlsPage 37 PTO Air SchematicsPage 38 PTO Electrical SchematicsPage 39 Hybrid PTO OptionsPage 40 Remote Start Stop SchematicsPage 41 M2 VDR Prep Information (NFPA)Page 42 M2 VDR to M2 ConnectionsPage 24 Body Lighting Interface SchematicsPage 25 Trailer PDMPage 26 Trailer Electrical Schematics (Seperate)Page 28 Wired Rite PrepPage 29 Wired Rite SchematicPage 30 Wired Rite Trailer and Floor connectionsPage 31 Tail LightsPage 32 Tail Light SchematicsPage 33 Transmission InterfacePage 34 Engine InterfacePage 35 Bulk Head Module (BHM)(Module 32A) Power Distribution (Module 285 PDM)Chassis Module (CHM Under Cab)(Module 335, 32K) Accessory Air Valve Assembly (AAVA)(Multiple Modules ) Body lighting Interfaces (Module 353, 296) Dash Switches(Module 329) Tail Light Configurations(Module 294) Trailer Interfaces(Module 296, 297) (Module )Engine Interface (Black Plug) (Plugs may also be frame located) 148, 163, 87L Transmission (Grey Plug) (Plugs may also frame locatedInterfaces.be (Module , 34C) Electrical Component Overview2010 M2 Electrical Body Builder Reference Page # 2 Rev: NewEPA 2010 ModelsPNDB Power Net DistributionBox (Module 33P/281/293) Electrical Harness OverviewFORWARD CHASSIS HARNESS Module 1) Connections to Bulkhead module and Underhood PDM 2) Connections to headlamps 3) Connections to side marker/turn lamps 4) Connections to Chassis Module 288AFT CHASSIS HARNESS Module 1) Connections to Chassis Module 2) Connections to tail lamps 28AMAIN CAB HARNESS Module 1) Connections to bulkhead connector 2) Connections to diagnostic connector (behind ignition switch) 3) Connections to CPC4) Pass-thru connector to engine compartment5) Gauge Cluster6) HVAC unit and controler7) Steering wheel horn and windshield wiper 320OVERHEAD CAB HARNESS Module 287 1) Inline connection to Main cab Harness (at bottom of A pillar) 2) Connections to Marker Lamps 3) Connections to Dome Lamp FRONTWALL HARNESS Module 321 1) Connections to Bulkhead Module and Underhood PDM 2) Connection to Starter Mag Switch 3) Connection to Wiper Motor 4) Connection to the low coolant level sensor and horn (under surge tank) 5) Connection under cab to Washer pump and level switch 6) Pass-thru connector to Main Cab Harness and Powertrain HarnessPOWERTRAIN HARNESS Module 286, 283 1) Connections to the Bulkhead Module and Underhood PDM ABS/AMU HARNESS Module 332 1) Connections to Forward chassis harness and frame ground studs near Chassis module 2) Connections to AMU (Mod 877 without ABS) 3) Connections to Wabco ABS ECU 4) Connections to rear combo valves 2010 M2 Electrical Body Builder Reference Page # 3 Rev: NewEPA 2010 Models Electrical Power Flow Overview2010 M2 Electrical Body Builder Reference Page # 4 Rev: NewEPA 2010 ModelsBatteryMain PNDBTCMTrailer PDMTail LightsBB PNDBBody Lighting ConnTransmission ConnectorBB PDMTrailer ConnectorEngine ConnectorMain PDMBHMPowertrain PDMECMICUCHMC2-F Trailer Marker Relay C2-H Trailer Turn Left Relay C2-E Trailer Turn Right Relay C2-A Trailer Power Relay C2-D Trailer Stop Lamp Relay Chassis Module OutputsBulkhead Module OutputsB5.E - SPARE (Utility Light/Spotlight) B4.M - SPARE (Utility Light/Spotlight) B3.E - Horn B5.F - Cigar Lighter Output B5.H - Panel Lamps B7.A1 - Panel Lamps (Smart Switch) B5.G - SPARE (Ignition) B6.A9 - Accessory (HVAC) B6.A10 - Accessory (Radio) B4.F - SPARE (Left Heated Mirror) B4.E - SPARE (Right Heated Mirror) B6.A8 - Ignition (VCU) B2.K - Ignition (Engine) B1.P - Ignition (ABS) B5.A - Battery (Dome Lamps) B7.A12 - Battery (Smart Switch) B5.D - Instrument ClusterB5.B - Dome Lamps Switched B1.L - Left High Beam B2.L - Ignition (Trans) B1.F - Fuel Water Sensor Power B3.F - Wiper High B5.C - Clearance Lamps B1.K - Tail/License Plate B1.R - Left Low Beam B3.H - Wiper Low B3.G - Washer Pump B2.M - AC Clutch B4.B - Starter Relay (Crank) /Trailer RelayC3-A Optional Fuel Water Separator Heater C4-C Left Park Lamp C4-L Right Park Lamp C4-D Left Marker Lamp C4-M Right Marker Lamp C3-N Turn Left Front/Side C1-G Turn Left Rear C3-R Turn Right Front/Side C1-P Turn Right Rear C1-A Left Backup Lamp C1-J Right Backup Lamp C1-H Backup Alarm C3-L Right Low Beam C4-K Right High Beam C1-N Left Stop Lamp C1-L Right Stop Lamp C3-K Right DRL C4-F Left DRL C3-C Optional Fog/Road Lamps C3-D Optional Fog/Road Lamps C5-H AMU Solenoid #0 C5-J AMU Solenoid #1 C5-L AMU Solenoid #2 C5-M AMU Solenoid #3 ECMTCMBHMCHMICUBBPNDBMainPNDBMainPDMPowertrainPDMBBPDMTrailerPDMBattery(296) Trailer Connector(353) Body Lighting ConnEngineConnectorTransmission Connector(294) Tail LightsJ1939 Multiplexed Network PNDB Power Net Distribution Box2010 M2 Electrical Body Builder Reference Page # 5 Rev: NewEPA 2010 ModelsINSTALLATION WITHOUTDISCONNECT SWITCHINSTALLATION WITHDISCONNECT SWITCHPrimary Solenoidfor Cut off SwitchBattery InputPrimary SolenoidCut Off Switch ConnectionATC Fuse OutputATC FusesMIDI Fuse OutputFuse Coverand labelPower Net Distribution Box (PNDB)The PNDB is a new power delivery system for the M2 designed to deliver more consistent and better protected power from the battery to the other components on the truck.The PNDB also has protected keep alive circuits that maintain power even with the cutoff switch is in the off position. The primary reason for this change is to provide power to the 2010 DEF purge system which drains urea from the delivery system and prevents the system from freezing during cold conditions.The PNDB located at the front wall is equipped with three MIDI fuses which supply power to the Main Power Distribution Module. These fuse connections have been relocated from the battery in 2010 to prevent corrosion and improve the trucks reliability in severe conditions.A secondary PNDB is available as an option for the body builder and will be located with the trailer and bodybuilder PDM located in the cab behind the drivers seat on day cabs or under the rear bench seat forcrew cab units. ATC -AATC -BATC -CATC -DATC Fuse outputkeeps power on afterdisconnectMating connector23-13153-4101A2231ABCDB3CADBECF4DBattery Input300 AMPS MaxAFTER TREATMENT ECUEMERGENCY POWERRADIO AND CLOCKALTERNATOR REMOTE SENSEGROUNDX2 KEEP ALIVE CIRCUITX1 SOLENOID CONTROLSIGNAL OFFLED INDICATORSIGNAL ONSIGNAL RETURNGROUND1234ABCDEFCONNECTORPINDESCRIPTIONFuse Description Function Rating Max. Fuse AllowedATC-A Keep Alive Power After Treatment ECU 30 AMPS 30 AMPSATC-B Keep Alive Power Emergency Power 20 AMPS 30 AMPSATC-C Keep Alive Power Radio and Clock 5 AMPS 30 AMPSATC-D Keep Alive Power Alternator Remote Sense 5 AMPS 30 AMPSMIDI-1 (Fuse 1) High AMP Fuse Powertrain PDM 175 AMPS 200 AMPSMIDI-2 (Fuse 2) High AMP FusePDM #2 125 AMPS 200 AMPSMIDI-3 (Fuse 3) High AMP Fuse PDM #1 125 AMPS 200 AMPSSolenoid Control Positive Cutoff Switch2010 M2 Electrical Body Builder Reference Page # 6 Rev: NewEPA 2010 ModelsBattery Box Disconnect Switch Mounting with box mounted air tanks (brackets will vary depending on application) 293-061In Cab Mounted Disconnect Switch Mounting 293-058Battery Box Mounting without box mounted air tanks293-001, 293-061Disconnect Switch Positive Disconnect SwitchThe disconnect switch system for 2010 has been reconfiguredto provide better application coverage and offer two levelsof power disconnect based on the options ordered with the truck.In cab disconnect switches will be offered in a locking or non locking configuration.Exterior battery mounted switches will be offered in the locking configuration only.Cutoff switches are equipped with red LED lights, which are when power is on.Trucks equipped with the body builder auxiliary power system will have an additional LED light on the switch. Note: Both PNDB units will be deactivated when the switch is in the off position. illuminated Axillary Body Builder Cutoff Switch StandardCutoff Switch Standard Power LEDLockout TabAuxiliary Powerand Main Power LEDMain Cab PNDBConnector Plug #23-13153-307Body Builder PNDBConnector Plug #23-13662-4011321423293-057293-061293-060293-058NEGATIVE LOAD DISCONNECT W/CAB MTD DISCONNECT SWITCH NEGATIVE LOAD DISCONNECT W/BATTERY BOX DISCONNECT SWITCH POSITIVE LOAD DISCONNECT W/BATTERY BOX CTRL SWITCH W/LOCKING PROVISION POSITIVE LOAD DISCONNECT W/CAB MTD CTRL SW W/LOCKING PROV MTD OB DR DEAT POSITIVE LOAD DISCONNECT W/CAB MTD CONTROL SWITCH MTD OB DR SEAT 293-063X2, Aux PNDBX1, Main PNDB The main Power Distribution Module (PDM) distributesbattery power to the various control modules on the vehicle.The PDM contains mini fuses that the power feed circuits to these modules. For most trucks there will be spare fuse slots available customers to add additional wiring to the truck after purchased.There are four plugs attaching to the module that supply output connections.Common spare fuse sockets are listed below but mayvary based on the options that have been requested.Common Spare Fuse locations F6, F10, F11, F14, F21, F23, F25, F26protect for it is ABBAACBGHEGDCBADBFCDHHGGDCHEEFSingle Wire Outputfound on Plug in Pin GGreenPDM Plugs contain outputwiresPDM #1(MIDI-3)PDM # 2 (MIDI-2)Engine HarnessPlug (Green)Forward ChassisHarness Plug (Blue)Forward ChassisHarness Plug (Grey)Front WallHarness Plug (Black)Main Power Distribution Module (PDM)Power Distribution Module Fuse Specications*OutputMEGAFuseConnectionFuseLocationPrimary FunctionFuseRatingSecondary FunctionFuseRatingGreen A1F1Spare{Green BGreen H1F2 Blower Motor 30A {{{{{2F3SpareSpareSpare30AGreen G2F430A30ABlack D12F5 Ignition Switch 5A { {Black C11F6Hydromax RelayGray F11F7 Bulkhead Module 30A { {Green C22222222F8 ICU3-M2 10A {{{Green D2111111F9†30ABlue GGreen F2F10SpareSpare{{{{{{{{Blue HF11 Spare { { {Black HF12 Radio/Diagnostic 20A { {Grey EF13 Chassis Module 30A { {Black BF14 Spare { { {Black AF15 Bulkhead Module 30A { {Blue AF16ABS ECU (pneumatic)15AABS ECU (hydraulic)25A25ABlue CF17 Chassis Module 30A { {Blue BF18 Bulkhead Module 30A { {Grey GF19 Chassis Module 30A { {Black EF20 Bulkhead Module 30A { {Black FGrey HGrey BF21 Spare { { {Black GBlue EBlue DF22 Bulkhead Module 30A { {F23Spare{{{{Grey DF24Hydraulic Pump andSpareGrey CF25 Spare { { {Multiple Wire output Pin A & B on Grey Plug and Pin Don Blue PlugGrey AF26Spare{{{2010 M2 Electrical Body Builder Reference Page # 7 Rev: NewMotor (hydraulic ABS)VBAT 1 BHMVBAT 2 BHMVBAT 3 BHMVBAT 4 BHMVBAT 5 BHMVBAT 1 CHMVBAT 2 CHMVBAT 3 CHMFVBATFusePin part number for harness connection23-13213-120 TERM-FEMALE,(20-16) PAC1207741123- -121 TERM- ,(14-12) PAC1212949313213 FEMALE23-13213-122 TERM-FEMALE,(10) PAC12077413EPA 2010 Models Power Supply Fuses and Associated Outputs for the Bulkhead ModuleBHM Power InputBHM PowerInput PinFuse Supplying BHMPower InputBHM Outputs SuppliedBHMPower InPower OutBattery (dome lamps)B5.ABattery (smart switches)B7.A12Ignition (VCU)B6.A8Ignition (engine)B2.KIgnition (ABS)B1.PIgnition (trans)B2.LFuel Water Sensor PowerB1.FDome Lamps SwitchedB5.BLeft Low BeamB1.RA/C ClutchB2.MSmart Switch 1 IndicatorB7.B4Smart Switch 2 IndicatorB7.B8Smart Switch 3 IndicatorB7.A5Smart Switch 4 IndicatorB7.A9Smart Switch 5 IndicatorB7.B10VBAT1B3.D Fuse 22 (30A)Battery (smart switch)B7.A12Accessory (HVAC)B6.A9Accessory (radio)B6.A10Wake Up (instrument cluster)B5.DLeft High BeamB1.LWiper HighB3.FVBAT2B4.G Fuse 20 (30A)HornB3.EWiper LowB3.HSpare 8.0A HSD (ignition)B5.GPanel LampsB5.HVBAT3B1.N Fuse 18 (30A)Panel Lamps (smart switch)B7.A1Clearance LampsB5.CTail Lamps/License PlateRelayB1.K*Washer PumpB3.GVBAT4B4.K Fuse 15 (30A)12V Output (cigar lighter)B5.FSpare 8.5A (utility light/spotlight)B5.E / B4.MLeft Heated MirrorB4.FVBAT5B1.J Fuse 7 (30A)Right Heated MirrorB4.EPower Supply Fuses and Associated Outputs for the Chassis ModuleCHM PowerInputCHM PowerInput PinFuse Supplying CHMPower InputCHM Outputs SuppliedCHMPower InPower OutRight Low BeamC3.LTurn Right Front/SideC3.RTurn Right RearC1.PRight Stop LampC1.LLeft Stop LampC1.NRight DRLC3.KFog/Road LampsC3.C/C3.DVBAT1C4.PFuse 19 (30A)Trailer Turn RightC2.ELeft Park LampC4.CRight Park LampC4.LLeft Marker LampC4.DRight Marker LampC4.MTrailer Marker RelayC2.FRight High BeamC4.KLeft Backup LampC1.ARight Backup LampC1.JBackup AlarmC1.HTurn Left Front/SideC3.NTurn Left RearC1.GLeft DRLC4.FVBAT2C3.JFuse 17 (30A)Trailer Turn LeftC2.HFuel Water Separator HeaterC3.AAMU Solenoid 0C5.HAMU Solenoid 1C5.JAMU Solenoid 2C5.LVBAT3C4.JFuse 13 (30A)AMU Solenoid 3C5.MOutput PinLamp/Trailer TailOutput Pin VBAT Fuse SystemBHM and CHM output pins are powered by multiple VBAT fuses through the main M2 PDM unit. If one of these fuses is tripped or blown then all pins in the circuit will be affected. For this reason seemingly unrelated issues can occur at the same time if a fuse is overloaded and trips. The lists below show which pins are controlled with the VBAT fuses. PDM VBAT Fuse Coverage2010 M2 Electrical Body Builder Reference Page # 8 Rev: NewEPA 2010 ModelsBulkhead Module BHMChassis Module CHM Bulk Head Module (BHM)The Bulkhead Module (BHM) The BHM is the primary command module for the M2 electrical system. The module controls the operation of the other component the either directly or indirectly using messages sent over The Bulkhead Module is mounted on the driver side of the front wall and connects to the interior wiring through an opening in the front wall.The BHM has four harness connections on the engine side of the front wall and three harness connections to the cab interior. The BHM Unit contains all system parameters and the unit controls power flow and circuit protection to the various components of the M2 electrical system.The BHM unit can also support up to 5 smart switches. The BHM is programable and can be changed and updated by flashing the unit through service link.Power supply for the BHM is supplied using VBAT fuses, which reside in the main PDM (see page 3)The BHM is programmable and the feature screen in service link can be used to or add parameters to the BHMmodules insystem the J1939 network.directly change B4 Front Wall HarnessB3 Front Wall HarnessB1 Forward Chassis HarnessB2 Engine HarnessB6 Dash HarnessB5 Dash HarnessB7 Dash HarnessB5.E - SPARE (Utility Light/Spotlight) B4.M - SPARE (Utility Light/Spotlight) B3.E - Horn B5.F - Cigar Lighter Output B5.H - Panel Lamps B7.A1 - Panel Lamps (Smart Switch) B5.G - SPARE (Ignition) B6.A9 - Accessory (HVAC) B6.A10 - Accessory (Radio) B4.F - SPARE (Left Heated Mirror) B4.E - SPARE (Right Heated Mirror) B6.A8 - Ignition (VCU) B2.K - Ignition (Engine) B1.P - Ignition (ABS) B5.A - Battery (Dome Lamps) B7.A12 - Battery (Smart Switch) B5.D - Wake Up (Instrument Cluster) B5.B - Dome Lamps Switched B1.L - Left High Beam B2.L - Ignition (Trans) B1.F - Fuel Water Sensor Power B3.F - Wiper High B5.C - Clearance Lamps B1.K - Tail/License Plate/Trailer Relay B1.R - Left Low Beam B3.H - Wiper Low B3.G - Washer Pump B2.M - AC Clutch B4.B - Starter Relay (Crank) 6.7A 6.7A 6.7A 6.7A 6.7A 6.7A Combined 6.7A 6.7A 6.7A 6.7A 6.7A Combined 6.7A Combined 6.7A Combined 12A Combined 12A 12A Combined 12A 20A Combined - Bulkhead Module outputs have defined amperage limits.- If higher loads are required, bulkhead module outputs should be used as signal power in conjunction with a relay.Key Bulkhead Module Outputs2010 M2 Electrical Body Builder Reference Page # 9 Rev: New Pin part numbers for harness connectionFEMALE23-13212-122 TERM-FEMALE,(10) PAC15326004Inside Cab Connections:PAC12129494 TERM-FEMALE,(12-14)PAC12034046 TERM-FEMALE,(16-18)Outside Cab Connections:23-13212-120 TERM-FEMALE,(18-16) PAC15304719123-13212-121 TERM- ,(14-12) PAC15304720EPA 2010 Models [...]... OPT-WRG-DASHO-CUST-COM-1A 4 OPT-WRG-SLPR-L-O-CUST-COM-1A 3 2 4” 12” OPT-WRG-SLPR-L-O-CUST-COM-2A 2010 M2 Electrical Body Builder Reference Page # 28 Rev: New EPA 2010 Models Wired Rite Schematic Chassis Connection Harness Back Wall Connections Dash Connections Overhead Connections 2010 M2 Electrical Body Builder Reference Page # 29 Rev: New 26 EPA 2010 Models 1 12 13 27 38 Trailer and Bodybuilder Floor Connections Plug Number... Combination 294-002 TRUCK-LITE 40 STOP/TAIL WITH SEPARATE BACKUP LIGHTS GROMMET MOUNTED Combination Stop/Tail, Separate Turn Separate Backup Lights 294-021 TRUCK-LITE 3 CHAMBER MODULES WITH 45 SERIES SEALED BEAM LAMPS 2010 M2 Electrical Body Builder Reference Page # 31 Rev: New All Plugs viewed from Front G Rear Light Connector (separate stop/turn signal) EPA 2010 Models G F E D C BA P N M L K J H P H Signal... OF CAB EPA 2010 Models Trailer Electrical System (Combination) Power from Battery Mod 285 Trailer Module See Mod 285 7 625341 Ground to Frame J560 1 6 Primary Trailer Recptical 90 deg or Streight Connector 2 7 5 3 4 Chassis Module (CHM) See Mod 353 for Connecting Harness 2010 M2 Electrical Body Builder Reference Page # 27 Rev: New M2 Wired Rite Prep Harness A prep harness is available on the M2 system... PNDB Disconnect GND Circuit # 23A 120C 376D 376C 36U 23A 52C 46T 38RT 38LT 36 36V 425J 425H 425K GNDE - 2010 M2 Electrical Body Builder Reference Page # 25 Rev: New Mod 296/297 Separate Stop/Turn EPA 2010 Models 296-010 PRIMARY CONNECTOR/RECEPTACLE CENTER PIN POWERED THROUGH IGNITION Trailer Electrical System (Seperate) 297-001 SAE J560 7-WAY PRIMARY TRAILER CABLE RECEPTACLE MOUNTED END OF FRAME... | C5-L AMU Solenoid 2 Digital Output X | C5-M AMU Solenoid 3 Digital Output X | 2010 M2 Electrical Body Builder Reference Page # 12 Rev: New EPA 2010 Models Multiplexing System Backbone J1939 The J1939 Datalink Control Unit Multiplexing System ABS ICU TRANS ENG The term "multiplexing" describes how the Business Class® M2 electrical system works 120 Ohm Terminating Resistor 120 Ohm Multiplexing is defined... fed by CHM pins 1, 5, and 6 The maximum combined current capacity for all three pins is 7.45A 2010 M2 Electrical Body Builder Reference Page # 22 Rev: New EPA 2010 Models Bodybuilder PDM Trailer and Body builder lighting Module For all 2010 configurations specked with the trailer and bodybuilder options, Freightliner provides an in-cab lighting module that provides high current capacity circuits that... Low-current Lighting Interface DEUTSCH DKBL BR BR Y DKBL DKBL R-W R-W DKG Ignition Power 12 11 10 9 8 7 2010 M2 Electrical Body Builder Reference Page # 24 Rev: New EPA 2010 Models Trailer PDM Body builder Trailer Module For all 2010 configurations specked with the trailer and bodybuilder options, Freightliner provides an in-cab trailer control module that provides high current capacity circuits that... Two-Speed Axle Enable Two-Speed Axle Enable † When more than one function is listed, see the Allison Transmission Vocational Model Guide for the applicable function §‡ Output 2010 M2 Electrical Body Builder Reference Page # 33 Rev: New EPA 2010 Models Engine Interface: Engine Interface Freightliner provides an engine interface harness when an rpm control system is ordered for optional body builder features... Spare Cav 15 Spare Cav 16 Vndr Female Part Number Connector 54241630 Terminal Pin 54001625 2010 M2 Electrical Body Builder Reference Page # 34 Rev: New All M2 PTO controls employ a Multiplexed dash mounted Smart Switch PTO Control wiring and air piping is driven by several different factors on the M2 Platform EPA 2010 Models PTO Installation Compatibility Customer Installed PTO Compatibility Chart Factors... (+) Switch Expansion Module Low Current Smart Switch Socket 2010 M2 Electrical Body Builder Reference Page # 16 Rev: New EPA 2010 Models High current Switch (Battery Hot): High Current Switches (Battery Hot) - Optional battery hot power switches are factory-installed, switch controlled power provisions that can be ordered for a Business Class® M2 vehicle - Optional switches can be ordered in various switch . EPA 2010 M2 ElectricalBody Builder Reference GuideElectrical System Overview2010 M2 Electrical Body Builder Reference Title Page Rev NewEPA 2010 Models Electrical. to rear combo valves 2010 M2 Electrical Body Builder Reference Page # 3 Rev: NewEPA 2010 Models Electrical Power Flow Overview2010 M2 Electrical Body Builder