4 Multiplexed Electrical System Service Manual Software P30-1011 Features New Systems NOTE Software versions are not backwards compatible; this manual contains service manual information covering vehicles equipped with software version "CECU3 with Chassis Node" (P30-1011). For vehicles with prior CECU software versions (such as: "CECU3 with Chassis Node" (P30-1009), CECU3 (P30-1008), ICU (P30-1003), and CECU/CECU2 (P30-1002)) refer to earlier publications. A vehicle is rendered inoperative if a CECU without the correct software version is installed. Brief overview of some of the newly introduced systems of the latest software version.
Steering Wheel Controls (cruise and radio) The multiplexed steering wheel is a carry-over design from other PACCAR markets. It communicates on the C-CAN line for audio and cruise control inputs from the operator. Radio The radio is now on the C-CAN databus. Virtual Gauges/Navigation/Telematics Unit (optional) The most notable change to NAMUX is the factory programmed interlocks. Interlocks are defined as parameters that must be validated before a function will engage. For example, the system will not allow the vehicle to move if the park brake switch has not been de-activated. This unit provides vehicle information to the operator and receives the information from the V-CAN.
The display provides real time information in the form of gauges. It is also connected to the C-CAN for audio output. The Menu Control Switch (MCS) now has the 'back' function as a dedicated button on the menu control switch on the dash. It is not a menu selection in the program. Rear Sleeper Radio Controls (optional) The rear sleeper audio controls communicates signals from the control panel in the sleeper to allow the occupant to control the audio from the sleeper. P30-1011 features fewer hardwired circuits and more communications over the CAN networks. The fault messaging capabilities have improved with this new release.
The information to the driver is more complete and can provide the driver with general action items for each warning icon. HVAC All air conditioning inputs are communicated to the controller through the C-CAN. Input for the HVAC system may come from sensors used by the engine computer or cab computer. For example, the outside air temperature sensor is mounted to the mirror and the signal must be sent through the door control module and the cab control module before being received by the HVAC controller. The program itself has improved capabilities with regard to trip information. There are 4 individual trip odometers that the user can customize to fit their needs.
If there is a data communication failure between the CECU and Instrument Cluster the Cluster Display will show a message indicating communication failure. This is intended to alert the driver that the Instrument Cluster is not displaying the gauges accurately and it indicates a physical failure on the I-CAN. Electric Over Air Switches Electric Over Air (EOA) switches initiate electrical signals to actuate air valves in order to activate and deactivate air functions (such as: suspension dumps, differential locks, PTO switches, trailer switches, etc.). There are a total of eight available EOA general function switches with four additional hardwired 4 - 2 PM819023/KM815057 (08/14/2012)