HOWO Electrical Diagrams PDF [PDF]

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A8 G1，G2 G3 M1 S1 S6/28 F53



Starting relay Battery Alternator Starter Key switch Power switch 10A fuse



S4 K28 SW1 K53 K50 M11 S50



Mechanical power switch Electromagnetic switch Starter switch under the vehicle 10A Relay Cab flip relay Cab flip electricmotor Cab lift button



D5



Diode



1 ○ 41 ○ 43 ○



Battery negative earth point Cab earth point,



left



A Power system B The starter equipment under the vehicle,electrical turns cab



Cab earth point, right



Page 1 of 24



A8 G1，G2 G3 M1 S1 K52 SS1



Starting relay Battery Alternator Starter Key switch Power relay Commonly power switch



SS2 SS3 A1 S14 D5 H201 SW1



Urgency power switch in the cab Urgency power switch out of the cab ADR control unit Gearbox neutral switch Diode ADR switch warning light Starter switch under the vehicle



ADR vehicle power system, starting system



Page 2 of 24



K1 K2 K3 K9 K11 K19 F1



PCV relay ECU main relay D+ relay (ADR) 15# power 1 relay Exhaust brake relay 15# power 2 relay PCV coil fuse



F5 F6 F7 F9 F13 F16 F18



Air dryer fuse Seat heating fuse 15# Backup power fuse ABS fuse PCV power fuse Exhaust brake fuse ECU power fuse



F19 F20 F21 F22 F23 F24 F25



ABS fuse Trailer ABS fuse Combination switch fuse Odometer sensor fuse VDR/Electromagnetic fan fuse Instrument power fuse Instrument power fuse



F26 F27 F28 F29 F30 Y6 R11



Cigarette lighter fuse CBCU-G1 fuse CBCU-G2 fuse CBCU-G3 fuse CBCU-G4 fuse Exhaust brake solenoid valve Air dryer



R6 Q R1 Y7



Electric heated seat 15# backup power interface Cigarette lighter Electromagnetic fan



Page 3 of 24



K4 K6 K7 K8 K10 K12 K13



Trailer position lamp relay (left) Electric horn relay High beam relay (left) Air conditioning power relay Wiper intermittent relay Working lamp relay Trailer position lamp relay (right)



K15 K16 F3 F4 F8 F11 F12



Pneumatic horn relay High beam relay (right) Working lamp fuse Trailer position lamp relay fuse (right) Electric horn/Pneumatic horn fuse Left high beam fuse Right high beam fuse



F14 F36 Y88 H1 E23 X5 X6



Wiper intermittent fuse Air conditioning fuse Pneumatic horn solenoid valve Electric horn Working lamp 7-hole socket in the trailer 15-hole socket in the trailer



1 ○ 41 ○ 43 ○



Battery negative earth point Cab earth point, left Cab earth point, right



Page 4 of 24



A7 K17 K18 F2 F10 X6 F50



Combined instrument 15# power relay Backup relay Light/Working lamp switches etc. fuse Trailer ABS fuse Trailer socket with 15 holes Overvoltage alarm equipnient fuse



F15 F17 F31 F32 F33 F35



Trailer socket/power switch fuse ECU-17 fuse CBCU-G5 fuse CBCU-G6 fuse TCU/K18 fuse Inner light, VDR, Radio & tape player fuse



41 ○ 43 ○



Cab earth point, left Cab earth point, right



A Electrical junction box B Combined instrument



Page 5 of 24



S3 S6/1 S6/2 S6/3 S6/4 S6/5



Combination switch Light switch Front fog lamp switch Rear fog lamp switch Emergency warning switch Horn conversion switch



X10 X11



Toggle switch lighting anode junction box Toggle switch lighting anode junction box



41 ○ 42 ○ 43 ○



Cab earth point,



left Combination switch and toggle switch



Cab earth point, middle Cab earth point, right



Page 6 of 24



S48 S49 S6/6 S6/7 S6/8 S6/9



Horn button on the steering wheel Horn button on the steering wheel PTO switch PTO neutral switch Wheel differential switch Axle differential switch



S6/10 S6/11 S6/19 X10 X11 T1



All-wheel drive switch Working lamp switch Upgrade axle up-down switch Toggle switch lighting anode junction box Toggle switch lighting anode junction box Upgrade axle mode conversion connector



A Toggle switch B Horn button on the steering wheel



Page 7 of 24



B4 B5 S28 S30 S31 B9



Brake air pressure Ⅰsensor Brake air pressure Ⅱ sensor Seat belt lock signal switch Spring charged signal switch Auxiliary gas signal switch Speed sensor



MCS



Menu knob



1 ○ 41 ○ 43 ○



Battery negative earth point Cab earth point,



CBCU control unit



left



Cab earth point, right



Page 8 of 24



B7 X5 X6 E26L E26R



Gas pressure sensor 7-hole socket in the trailer 15-hole socket in the trailer Turn lamp, left Turn lamp, right



1 ○ 41 ○ 43 ○



Battery negative earth point Cab earth point,



CBCU control unit



left



Cab earth point, right



Page 9 of 24



E1 E2 E3a E3b E4a E4b E5 E6



Rear position lamp-left, license lamp Rear position lamp-right Headlamp high beam, left Headlamp low beam, left Headlamp low beam, right Headlamp low beam, right Front position lamp, left Front position lamp, right



E25L.R E30 E40 E41



Side marker lamp, tractor Ash tray lighting lamp Aux. high beam lamp, left Aux. high beam lamp, right



1 ○ 41 ○ 42 ○ 43 ○



Battery negative earth point Cab earth point,



left



Cab earth point, middle



A



Position lamp



B



Headlamp beam and aux. high beam lamp



Cab earth point, right



Page 10 of 24



E15L,R E18 E7L,R E68L,R X85/1,2 S16,S17 A12 H1



Interior lighting lamp, left and right Interior lighting lamp, middle Front width lanip, left and right Sleeping bed reading lanip, left and right Junction box Door lamp switch, left and right Radio & tape player Electric born



B14 B15 H10 Y88 E23 E10,E12 E54,E55



Front loudspeaker, left Front loudspeaker, right Overvoltage alarm equipnient Pneumatic horn electroniagnetic valve Working lamp Front turn lamp, left and right Rear turn lanip, left and right



55 Roof earth point, left ○ 56 Roof earth point, right ○ A



Electric appliance of standard cab



B



Overvoltage alarm equipnient



C



Turn lamp



Page 11 of 24



A6 E15L E15R E69H E69L E19L E19R



Thermal container Interior lighting lamp,left Interior lighting lamp,right Reading lamp of upper berth Reading lamp of lower berth Interior lighting lamp of left roof Interior lighting lamp of right roof



E7L E7R E8L,E8R X85/1,2,3 H10 X30 A12



Front width lamp, left Front width lamp, right Rear width lamp, left and right Junction box Overvoltage alarm equipnient Cigarette lighter socket Radio & tape player



S16 S17 B14 B15



Door light, left Door light, right Front loudspeaker, left Front loudspeaker, right



56 ○



Roof earth point, right



A Electric appliance of high-roof cab B Overvoltage alarm equipnient



Page 12 of 24



S26 S27L S27R S29 R11 D7 F5



Low range gear switch Cab lock switch, left Cab lock switch, right Air filter blocking switch Air dryer Diode Reversing buzzer



E38,E39 E52,E53 E9/L.R E14/L.R Y8



Front fog lamp, left and right Brake lamp, left and right Rear fog lamp, left and right Reverse lamp, left and right Mid-servo steering valve solenoid valve



1 ○ 41 ○ 42 ○ 43 ○



Battery negative earth point Cab earth point,



left



Cab earth point, middle Cab earth point, right



A B C D E



Switch signal input Front fog lamp Rear fog lamp Reverse lamp Brake lamp



Page 13 of 24



S3 M2 M5 S20 S21 S22 S24



Combination switch Wiper niotor Washing pump motor Wheel differential switch of intermediate axle Wheel differential switch of rear axle Axle differential switch PTO switch



S25 Y1 Y2 Y3 Y4 Y5



All-wheel drive switch PTO neutral solenoid valve PTO solenoid valve Wheel differential solenoid valve Axle differential solenoid valve All-wheel drive solenoid valve



1 ○ 41 ○ 42 ○ 43 ○ A B



Battery negative earth point Cab earth point,



left



Cab earth point, middle Cab earth point, right Differential lock and PTO system Windscreen wiper, washing pump



Page 14 of 24



A300 M7 B10 B11 X14 X118 Y18 S6/23



Air conditioning control module Wind motor Interior temperature sensor Evaporator temperature sensor 14-line junction box Air conditioning cable connector Solenoid clutch Main-vice box change switch



S66 B7 B7'



High and low pressure switch Main fuel tanker sensor Vice fuel tanker sensor



1 ○ 42 ○ A B



Battery negative earth point Cab earth point, middle Air conditioning system Dual fuel tank electrical installation



Page 15 of 24



A13 S6/16 Y11 B13 Y12 B14



ECU of the ABS-E edition ABS check switch Front solenoid valve, left Front wheel sensor, left Front solenoid valve, right Front wheel sensor, right



Y13 B15 Y14 B16 B17 Y15



Rear solenoid valve, left Rear wheel sensor, left Rear solenoid valve, right Rear wheel sensor, right EBL sensor ASR solenoid valve



X6 X14 X18



ABS 7-hole socket in the trailer ECU 14-hole connector ECU 18-hole connector



41 ○ 43 ○



Cab earth point,



left



Cab earth point, right



Page 16 of 24



41 ○ 43 ○



Cab earth point,



left



Cab earth point, right



Page 17 of 24



A17 A17' D1、D2 B9'



Trip recorder(VDR) MTCO1324 Diode Intelligent speed sensor



1 ○ 55 ○ 56 ○ 41 ○ 43 ○



Battery negative earth point Roof earth point,



left



Roof earth point, right Cab earth point,



A B C



Trip recorder(VDR) Trip recorder(VDR)(Standard cab/MTCO1324) Trip recorder(VDR)(High-roof cab/MTCO1324)



left



Cab earth point, right



Page 18 of 24



S5 S9 S10 S14 S15



Cruise combination switch Exhaust brake switch Brake lamp switch Gearbox neutral switch Reverse switch



Y8 SW2 D4 D9 D10



Auxiliary brake electromagnetic valve group Shutdown switch Neutral gear signal diode Neutral gear signal diode Reverse gear signal diode



D11



Reverse gear signal diode



Common rail engine ECU peripheral circuit



41 ○ 43 ○



Cab earth point,



left



Cab earth point, right



Page 19 of 24



X80 S52 S6/20 S6/21 S6/37



ECU diagnostic interface Clutch switch ECU diagnostic switch PTO switch Unload operation switch



R2、R3



120Ω resistance



41 ○ 43 ○



Common rail engine ECU peripheral circuit Cab earth point,



left



Cab earth point, right



Page 20 of 24



F200 K24 R7 S35 E100



200A fuse Preheat relay Preheater Oil-water separation signal switch Ultra-emission indicator



Common rail engine ECU peripheral circuit



41 ○ 43 ○



Cab earth point,



left



Cab earth point, right



Page 21 of 24



AMT ECU peripheral circuit



41 ○ 43 ○



Cab earth point,



left



Cab earth point, right



Page 22 of 24



A



AMT ECU peripheral circuit



B



EGR engine ECU



Page 23 of 24



S6/61 S6/62 S6/63 S6/64 S6/22 WL



Gear switch Ball valve heating switch Jar water switch Self-protection switch Warning light switch Warning Light



41 ○ 42 ○ 43 ○



Cab earth point,



left



Cab earth point, middle



A B



Pumper additional electrical equipment Warning light electrical equipment(for standard and long cab)



Cab earth point, right



Page 24 of 24