Paccar Kenworth T800 2012, Manual

Page: 253 / 276

8-33
08/12
Section 8
Electrical
MULTIFUNCTION TURN SIGNAL STALK, CHASSIS NODE & CHASSIS
LOAD CENTER
Kenworth introduced the chassis node and chassis load center with 2010 emissions. The information that follows covers
the functions of the chassis node, along with guidelines for installing additional lights on the chassis.
Exterior Lighting Circuit Limits
The multifunction turn signal stalk communicates to the CECU inside the cab which sends information to the Chassis
Node over the F-CAN bus. The Chassis Node then activates the load requested, drawing power from the chassis PDC.
The Chassis Node is designed to operate within specific current limits for
• Headlamps
• Fog lamps
• Vehicle stop/turn signal lamps
• Trailer turn/vehicle forward side facing turn signal lamps
• Back Up Alarm
• Windshield Washer Pump
If the current limits for any of these circuits are exceeded, the Chassis Node will default to a protection mode, causing the
lamps to not function properly but still providing sufficient lighting for safe operation of the vehicle. See TABLE 6-3 for load
limits.
The vehicle can exceed current ratings on a particular circuit in two ways
• Installing too many lamps on a circuit
• Using bulbs of excessive wattage
The following table is a recommended guideline to avoid exceeding the current limits of the Chassis Node. The Chassis
Node receives power from the chassis PDC, see Figure 8-24.
TABLE 8-4.
Chassis Node Guideline
Chassis Load
Center Name
Function Chassis
Node Circuit
Chassis
Node Pin
Current
Limit
CN1 Left Head Lamp* G1 A04 15.4
CN2 Right Head Lamp* G2 A16 15.4
CN3 Front Turn Lamps G3 B01 15.6
CN4 Rear Turn/Stop Lamps G4 B10 15.6
CN5 Left Turn Trailer G5 B19 15.6
CN6 Right Turn Trailer G6 C19 15.6
CN7 Fog or DRL Lamps G7 B18 15.6
CN8
Back Up Alarm/Windshield Washer Pump/
Electric-Over-Air
G8 C15 16.6
*A maximum wattage of 65W should not be exceeded for either low or high beam headlamps.