Typical conventional electrical wiring in modern
cars is very complex and runs to almost every corner of the car and though
manufacturers are starting to use smaller guage of wires its still
can be of
Therefore wiring will be eliminated to use as view wires as possible and its its
place a custom communication bus with modules throughout the car be
utilized to control various elements like lights and controls. Benefit of it
will be that all control lines will be practically eliminated and power carrying
wiring will be reduced to just couple of feet to between modules and controlled
devices. They will also can be reduced in guage as the drop on wire will not be
as great due to the length of the power wire. Benefit of it will be that
overall electrical system will be much lighter due to lower count of cabling.
Trouble shooting of electrical system will be greatly improved at same time.
systems will be linked via single communication bus, sharing sensor and data
collecting inputs can be shared between processing modules and processed for
different operating condition. One example of it is the
Gear Selector Indicator tough in this version it does not indicate
communication bus connection.
Other example is the window drop circuit. In some
circumstances it is required to drop door window my an inch so that when opening
door it will not interfere with door or window weather stripping then bring the
window to a close when door is closed shut. This could also can be added to any
OEM cars as add-on or with combination to alarm to either raise or drop the
Steering Column selection
Looking around for a short steering column that would fit in and clear
pedals yet still have modern look was a bit of a chore as most North American
sources had long columns before 1st U joint, same went for European
counterparts. One choice was from Acura 04-06 TL which has a very short column,
tilt and telescopic option and also the column controls are fairly good looking.
Other option is from Honda Accord 04-07 which is basically as the TL but with
bit different stock look.
It seems like the single simples thing is on the ignition switch.
Figure to the right shows wire color map and with only 5 wires it controls it
provides Accessory, On and Start outputs with dual ON outputs where one shuts
off certain parts of circuits while starting engine.
Wiper & lights / turn signal control
The problem comes with the output from those switches. For some reason Honda
decided to multiples the switch signals via microcontroller mounted in the wiper
switch fed via CAN but into fuse box that they are calling it Multiplex
Integrated Control Unit (MICU). To make
things a bit worse they had decided to use Philips AU5790D
or alternative TH8065
single wire CAN controller that is connected through 8 pin connector on the
wiper switch where only 6 pins are used. It would had been so much easier if
they had used differential (high - low) bus. The traditional way would had been to
have individual wires from the switches going to according circuits however that
would end up with around 14 wires. Not extremely large amount especially if you
think that there is already an 8 pin connector used between the switch and MICU.
So came few questions:
1) Should the column and the switches be replaced as putting alternative
switches on the column be probably impossible to find switch with same mounts.
2) Should the control board be replaced with custom one and more suitable
interface ie normal CAN bus interface or LIN or K-bus
3) Alternative option is to decode the bus protocol and make custom decoder with
specific outputs or control module
4) Other option is to use the Honda MICU fuse box and hopefully it will work as
designed and not need any other modifications to it ie immobalizer. This probably
is the least amount of work but will have to locate one box and try it out.