Day 22 - Honda Multiplexing Board

1. Using the wiring diagram identify the plugs/pins and wire colours for the communication lines between the nodes.
The drivers door(A15) and drivers side door(A2) are communicated by using a Brown colour wire.
The drivers side door(B1) and the passenger side door(B9) are communicated by using a Pink colour wire.

2. Using the wiring diagram identify the plugs/pins and wire colours for the Earths and voltage supply lines between the nodes.

	Drivers door	Drivers side door	Passenger side door
Earths (colours)	A12, A19 Black	B11, A14 Black	B22, A8 Black
Voltage supply (colours)	A1 Pink	A12 Pink	A24 Pink

3. Create a fault in the unit and describe in detail how this fault is affecting the normal operation of this system
The drivers rear window does not go down.

4. Using the wiring diagram analyse the fault and describe in detail what may be causing this fault.
Relay of the right rear window could be faulty
Multiplex control unit could be faulty
Communication line between drivers door and drivers side door could be faulty

5. After reading the manual put the system in to test mode 1. Note the codes (if any) and possible faults that the system gives you.
Steps to put the system in to test mode 1 -
1. Turn on the S/W marked Multiplex(more than seven seconds)
2. Beep once (mode1)
3. If the system continues to beep, there is a DTC code stored

9. Put the system in to diagnostic mode 2, conduct the input tests and note the results.
Steps to put the system in to test mode 2 -
1. From mode 1 the muliplex switch off by seven seconds then turn the switch on.
2. Beep third time (modd2)

Multiplex Control Unit (Passenger’s)	Multiplex Control Unit (Driver’s)	Multiplex Control Unit (Door)
Front passenger’s door	Right rear door light switch	Driver’s window (up/down)
Light switch	Driver’s door light switch	Front passenger’s window
Left rear door light switch		Drivers side rear window
		Rear passenger’s window
		Driver’s central locking