CAN - Multiplexing Worksheet

for this task i used a 2005 range rover.

the twisted wire pair were located next to the ABS modulator. one wire was coloured yellow and brown, the other wire was coloured yellow and black.

i then recorded a waveform from one of the wires below.

the wire colour i used was yellow and brown.
i used a 5 micro second time frame
volts per division 1V


i then recorded a waveform of the other wire:

this was the yellow and black wire
time per division = 5 micro seconds
volts per division = 1V

aliasing is described as:
jaggerd, stairste effect on curved or diagonal lines that are produced in low resolution, as in a computer printout or display.

these waveforms are not aliasing because they are not as described above.


the first waveform, the main voltage on the line is 2.5V
the other voltage on the line, when the voltage is pulled down is 1.4V
in the second waveform the main voltage on the line is 2.5V
the other voltage on the line, when the voltage is pulled up is 3.5V


SCAN TOOL OBSERVATIONS

on the scan tool, the different functions to examine the CAN system are:

control unit versions
fault codes
actual valves (all select)
actual valves (manual select)
actuations

these are the systems that are controlled by the CAN system:

lights - low speed
wipers - low speed
washer fluid - low speed
central locking - low speed
airbag - high speed
window actuators - low speed
instrument cluster - high speed
ABS - high speed
mirror - low speed
air conditioning - low speed