Controlled Area Network Board

Can Low means that base voltage (2.2 Volts) is being pulled down from the base voltage when the system is communicating ... the base voltage was being pulled down by 1.5 Volts.
2.2-1.5= 0.7 Volts when communicating and 2.2 Volts when not switched.
Can high means that the base voltage (2.2 Volts) is being pulled up from the base voltage when the system is communicating ... The base voltage is being pulled up by 1.5 Volts.
2.2+1.5= 3.7 Volts when communicating and 2.2 Volts when not switched.
These two are mirror images of each other and is used to double check each message and to make sure there are no wrong messages is transmitted and to identify if there are any faults within the Can system.

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Both voltage regulators are similar to the voltage regulator we made in TTEC4824 they change the voltage from 12 volt supply to 5 volts

Pin 1 and 2 input U2 7805 Pin 14 VDD

U1 7805 IC chip MCP 2505 - 14 pin

Input 4 and 5 IC UC 5350N Input pin 7-8 in and out of 1-4 goes into IC MCP2505 , Input 12-13 pinout 1 goes to IC2 then to transistor U3 and output is connector 1

For the voltage regulator U1 it is connected to pin 1 (MCRL/VPP) , pin 20 on the positive of the IC chip 18F258 then to LED 1 , then Pin 3 of VCC of the IC4 UC5350N to Pin 15 VSS and Pin 6 is negative which is the ground for IC 3 MAx 232.

For the right indicator the output pin is pin number 5 and the input pin which is on connector 4 and pin number 7 and also a transistor is used U7.

For the rear wipers theoutput connector pin number 7 and the input pin which is also on connector 4 and pin number 9 , also the transistor used is U14 and relay RL4B is used.