So I've been researching how to get the Mitsu navi (MMCS) to display the AUX input video in motion. The reason for this being I would like to install the HKS comp 2 unit to display gauge data to avoid using gauge pods. Feel like it would be an awesome look and provide features similar to the display of the GT-R.

From what I've been able to discover the Vehicle sends a Speed Signal "On" or "Off" command from the ECU depending on whether the car is exceeding 6km/hr.

In modes where the Navi system cannot be used during driving the MMCS receives a speed speed signal from the ECU and I'm assuming its this speed signal that controls the use of the Aux Video input in motion.

According to the Mitsu Service manual the vehicle speed signal error (which permits the use of video in motion) can occur with a faulty ECU, but may have other probable causes:

PROBABLE CAUSES
•The combination meter may be defective
•The multivision display may be defective
•Damaged harness wires and connectors

From here it seems that there can be a harness issue which suggest a short of some kind my enable video in motion and that is probably the easiest point to modify signal between the combination meter and the MMCS in order to fool the MMCS into thinking that the vehicle is not in motion.

For example if the navigation system can be modified during motion (which most OEM navigation units prohibit)

The service manual suggest:
STEP 4. Check the wiring harness between combination meter connector C-04 (terminal 20) and multivision display connector C-13 (terminal 13).
•Check the communication lines for open circuit and short circuit..
NOTE:
Also check intermediate connector C-108 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-108 is damaged, repair or replace the connector as described in GROUP 00E, Harness Connector Inspection P.00E-2.
Q:Is the wiring harness between combination meter connector C-04 (terminal 20) and multivision display connector C-13 (terminal 13) in good condition?
YES :
Go to Step 5.
NO :
The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

It appears as though either a short circuit (constant) signal or open circuit (no signal) controls the vehicle in motion command.

Does anyone know what the speed control signal is?

For example is it a 5v signal when the vehicle is in motion and 0v when the vehicle is stopped?

With a simple control signal it would be easy to splice the harness above with a standard ON/Off switch in the center council to enable Video in motion.

Any feedback would be greatly appreciated.

 

So with some more searching aparently Blitz has already come up with a solution for this with a jumper which enables TV-NAVI in motion...

http://minkara.carview.co.jp/userid/...037/parts.aspx

Translation via bable fish:

Usually, while travelling television and DVD of the car navigation which cannot be viewed viewing the television jumper kit which becomes possible. It is the necessity to the boring occupant. In addition, with TV-NAVI JUMPER DV-S, even while travelling destination setting of navigation becomes possible in addition to the function of TV JUMPER DV. Because the substance and the harness have become 1 sets, just purchase the package of car classification necessary ones everything to be even, directly it is installation possible.
So it appears with this you could then plug in the HKS camp 2 unit into the AUX inputs and get a digital display of gauges like the GT-R has.

 

Why don't you just hook up a switch to the reverse sensing wire, and use the backup camera input to display the information?

 

That is another option that I haven't considered. Does the Backup camera also use RCA inputs?

 

Yes, it does.

 

The only problem with using the backup mode are the words that come up on the screen while it's on. Something like "check surroundings" or whatever. It's not a 100% clear pic like it would be on aux

 

wolvie, your goal has been something i've wanted as well--i was thinking exactly the same thing as you. subscribed.......... hope you find a solution to this.

i have been told to use the rear view link as well, but i didn't know it added that text. axe that idea.

 

regarding the blitz solution:

Haven't been able to find this option on the Blitz USA webpage and its about $280 on the JPN web page ~28,000 yen and looks like it was available in June 2009 and don't know if they are planning on selling it in the US.

Maybe I'll have to order it from there

Still haven't given up on trying to play with the speed signal but I won't be able to get to it for awhile

 

This was the AUSDM solution

http://www.resourceit.com.au/MMCS/products.htm

and instructions
http://www.resourceit.com.au/MMCS/Mi...l%20System.pdf
I beleive the interface box has a resistor to change the voltage so it only see 4k/hr. As long as the speed signal is receiving voltage it wont use the gps override.

 

nice find. I am going to order this, i hope it works.

 

Nice find.. do they ship international?

This confirms some more of the information I've been finding on the internet regarding the speed signal

Most in dash navi systems to improve accuracy recieve a Vehicle Speed Signal (VSS), and since these Navis OEM and Aftermarket can be placed in various different makes and models suggests that there is some standard dedicated signal to the Navi of vehilce speed.

This is much easier to deal with than if the the Speed signal iwas part of a CAN bus containing multiple signals, as CAN is usually make specific i.e. GM CAN software is different than FORD or Toyota etc...

From what I've been able to discover the VSS singal is a 0-5V pulse which pulses at 800-1000 pulses per minute when the vehicle is in motion.

So a possible simple solution is an Open circuit switch wherein a 0V reading to the Navi would indicate vehilce is not in motion. (simplest possble solution but not confirmed). I need to log the VSS signal to see if this is the case.

However, the AUS solution seems to suggest the other possible solution I was thinking of is required as a simple OC circuit may not work. By using a processor in a project box which funcitons as a pass though for the VSS signal when regular navigation is desire but when activated sends a 0-5V pulse signal corresponding to low speed/vehicle not in motion, should fool the navi input into thinking the vehile is moving slow/stopped.

 

please keep me posted on if this works.

 

Don't know if they ship internationally but I will be willing to help out.

 

they do ship internationally.

 

Another alternative from Japan Parts...

http://japanparts.com/db/partslist.p...dle=2&small=41