Multiplexed Electrical System Service Manual 5 CECU Comparison Chart - (Pinout) PM819023/KM815057 (08/14/2012) 5 - 5 Conn Pin Number Circuit Function C 1 Power supply +5V sensors 2 Analog return 3 Electric over air switch 1 input 4 Not used 5 Spare analog input 6 Air pressure transducer - primary 7 Air pressure transducer - secondary 8 Air pressure transducer - application 9 Gauge Sensor 1 10 Air filter restriction 11 Gauge Sensor 2 12 Dimmer switch (up) 13 Dimmer switch (down) 14 CVSG data 15 CVSG return 16 Outside air temperature (Pre- 2010 engines only) 17 Electric over air switch 3 input 18 Electric over air switch 4 input 19 Electric over air switch 5 input 20 Electric over air switch 6 input 21 Transmission oil temperature - main 22 Electric over air switch 7 input 23 Pyrometer (Pre-2007 engines only) 24 Electric over air switch 8 input 25 Analog return 26 Electric over air switch 2 input 27 Spare 28 Spare 29 Spare 30 Gauge Sensor 3 31 Wiper resistor ladder 32 Turn signal resistor ladder 33 LVD battery voltage 34 Gauge Sensor 4 35 C-CAN ground 36 Not used 37 C-CAN high 38 C-CAN low 39 Trailer stop lamp relay 40 D-CAN high 41 D-CAN low 42 D-CAN ground 43 B-CAN high 44 B-CAN low 45 B-CAN ground 46 Marker flash 47 Windshield washer pump 48 DRL interrupt 49 Marker lamp (Trailer) (Kenworth) 50 Fuel Level Sender Select 51 Headlamp flash 52 Headlamp high/low Conn Pin Number Circuit Function A 1 CVSG power 2 Power - battery 3 Cab dome lamp output 4 Menu control switch power 5 Ground 6 Menu control switch ground 7 Dash/panel illumination 8 Auxiliary backlighting 9 Power - battery B 1 Menu control switch encode A 2 Menu control switch encode B 3 Menu control switch enter 4 Exterior lighting self test input 5 Ignition input (Start) 6 Dome lamp input 7 Seat belt telltale 8 Cruise set 9 Cruise resume 10 Back-up alarm mute 11 Retarder select 1 12 Retarder select 2 13 Clutch switch 14 Headlamps active 15 PTO set 16 PTO resume 17 Engine fan override 18 Regen enable 19 Inhibit regen 20 ABS off road 21 Marker lamp (Tractor) 22 LVD input 23 Transfer Case Engaged 24 Reserve - passenger seat occupancy sensor