Controlled Area Network Board

 L-CAN : A yellow wire, The signal starts high voltage. After then the voltage drops.
 H-CAN : A blue wire, The signal starts high voltage. After then the voltage goes up.

Base voltages : The voltage of a yellow wire is at around 2.7v.
                          The voltage of a blue wire is at around 2.1v
 Two graphs have a mirror image. When the L-CAN voltage drops, the H-CAN voltage goes up.
 When the components are operated, such as a right indicator, rear wiper and stoplights, the original graph is changed compare to the operating components. Also when the component is changed, the pattern is slightly different. However, I have not clearly seen the graphs because of the "aliasing"





Input wire colours : Black, Light green, Brown, Green, Orange, White, Pink, Red and Yellow.

Output wire colours : Black, Black/Brown, White/Black, Brown, Gray/Violet, Red/Green, Yellow/Brown, Black/Yellow, Brown/Green.

Right hand indicator

Input : Pin7, R5, ZD5(R13), Pin6 of VP18F258, Pin23,24 of RB2/CAN TX and RB3/CAN RX, Pin1,4 of IC4, Pin1,2 of H-CAN and L-CAN

Output : Pin1,2, FS3/5A, D5, U2 7805, 14VDD, Pin5 of MCP 2505-14pin, R32, IC9, U7, Pin5

Rear wiper

Input : Pin9, R8, ZD7, R15, Pin25 of VP18F258, RB2/CAN TX and RB3/CAN RX pin 23,24, IC4, CAN H 7 and CAN L 6, Pin1(CAN-H), Pin2(CAN-L)

Output : Pin4,5, 7 CAN-H and 6 CAN-L of IC5, 13 TX CAN and 12 RX CAN, Pin10 of MCP 2505-14pin, R35, U14, RL4A, FS5 15A, RL4B, Pin7

Voltage regulators

Input pins : 12v supply voltage comes into voltage regulator(U1 7805) which distributes 5v to VP18F258, IC3 and IC4 for its operations through pin VE and VCC.

Output pins : 12v supply voltage also comes into voltage regulator(U2 7805). This regulator gives 5v to VCC of IC5, MCP2505-14pin and five optic couplers (IC2, IC6, IC7, IC8 and IC9).

Circuit operation

Output 1 to 5 are tail light, reverse light, stop light, left and right indicator which are controlled by IC chips from IC2 to IC9. 5v turns on the LED the inside of the IC chip and this LED is triggering for operations which is called LED optical trigger (optic coupler).

 The other output of fuel pump, rear wiper, and spare are controlled by transistors from collector to emitter and bases are pin6, 10 and 11 of MCP 2505, these bases trigger transistors when the current flows from collector to emitter, relay's control side turns on and power side switches on and the output will operate.