Controlled Area Network Board

Cocntrolled Area Network Board

For this CAN board we used the dual channel oslliscope wich we campare the High CAN and Low CAN data.

Pin # 1  is the High CAN and Pin # 2 is Low CAN , High CAN wire color is Blue and Low CAN color is yellow.

On your capture also were the data pattren start and finishes.



Channel 2 is High and 1 volt per division

Channel 1 is low and 1.40  volts per division

These pattern are two channels high and low they are like miror opposite of each other , we can see on this oscilloscope pattren wich channel 1 is going high from 0 volt to 1volt and the channel 2 is going down 1.4v to 0 volt or gronding.

For each of the following capture the pattern and identify were it changes in relation to the original pattern.

                                         Right indicator

                                              Rear wiper

                                            Reverse light

                                              Stop light

                                               Fuel pump
we can see on these oscilloscope capture wich i marked , the fist pattern the data transmitted wich thrugh the system the dece which is adressed , the commonication process controll and examined .

Using the wiring diagram and CAN board identify the input / output pins , wire . colurs and realay or transistor for the right hand indicator and rear wiper.

For the right hand indicator the input pin is #7 and the pin # 7 risitor 5 signal go throgh to pin #6 to IC 18f, the output is IC9 to transistor U7wich signal goes throgh to righ hand indicator light.
For the wiper pin # 9 go throgh to pin # 25 the output to transitor U14 switch to relay 4 wich is switching the wiper.
The voltage regulator for control unite A also that is voltage regulator for control unite B wich LM7805 Ic the output voltage is 5v and the input voltage is come throgh to #1 leg of regulator, pin#3 is the feed back leg wich come into pin#2,the diode are used to for the smoot signal of capacitor . these supply voltage regulator for the control unie A and b are Pin 20 of mc 18f258 and pin 3 for 1c4 and pin 5 for IC5 and pin # 14 for the mcp 2505.

Honda Multiplexing Board Worksheet

Honda Multiplexing Board Worksheet

1: Using the wiring diagram identtify the plug/pins and wire for the commonication line between the nodes.
Between door unit and driver unit the commonication wire colur Brown and Pin NO A15 door and no 2 driver .
Between driver unit and passenger door unit wire color is Pink and Pin NO B1 for driver No 9 the passenger site.


2: Identify the plug/ pin and wire color for Earths and voltage supply line between the nodes.


 Earth - A12 A19 Black,  Voltage supply - A1 pink( Door Unit)
 Earth - A14 B11 Black,  Voltage supply - A1 white/black A12 pink A24 (Driver unit)
 Earth - A8 B22 Black, Voltage supply - A22 yellow, A24 ( Passenger Unite)


 wiring diagram:

Fault create by instructor:


The system was working , after asking the tuture to create fault after that the passenger door Windows system and center locking system does not works  


Analyzing the fault:
There is open circuit or disconnected the commonication line between the driver unite and passenger unite . B1 pink which output from the driver unite B9 input passenger unite .
R/R and F/R coniction system is also connected from driver unite


Test mode 1
DTC Code # 2 the driver unite is not able to receive the signal from the passenger unite.


6: Do the codes concur with what you thought the problem might be from question 4, explain?
Yes, i agree with my answer with 4 because i said there is no communication between driver side unit and passenger side unit.


8. Conduct the tests in step 6, what is your results and conclusions?
My conclusion which i said in question 4, the communication line between the drivers side and passenger side was disconnected, because the other configuration which i have got. The center locking system is also controlled from the passenger side unit. Then we did test mode on manual that also tells us that system is faulty. 


9. Put the system in to diagnostic Mode 2, conduct the input tests and note the results.
Multiplex Control Unit
(Passengers)
1 door switch
2 door switch


11. Using wiring diagram from the back of the manual describe what tests you would carry out now and what results you would expect. Note wire colours and pin/block numbers.
Pin number A15 in passenger unit, ground from passenger door switch which output from switch earth trigger.


12. Put the system in to sleep mode and measure the time it takes and the parasitic draw, Explain why this system is necessary.
It is important to know any open communication line or short communication line.

The voltage supply from the switch to driver unite

The output from the relay to driver unite

Sleep mode 

 Wake up mode