19 Digi Dash Info Thread

[Chet T16]

Ok, so been playing with one of these to see how it works.

Theres a 15 pin connector of which 14 are used:

1. Earth
2. Battery +ve
3. Ignition +ve
4. Speed data Not sure where this comes from. Taken off the speedo cable i guess?
5. Fuel flow I think this is a negative pulse from the ecu/injectors?
6. Fuel level Variable resistance. 0 resistance = 15.6 gallons
7. Temp data Variable resistance. Open circuit = 122 degrees
8. Side light
9. Light dimmer
10. Temp earth
11. Fuel level earth
12. Low fuel warning
13. Trip comp reset Dash switch
14. Trip comp cycle Stalk switch

I have neither a 19 with a trip computer nor a wiring diagram so if anyone has to mean to check or knows the deal with the speed and fuel flow data it'd be appreciated.

 

[Chris H]

the fuel data is from the ECU. It will just tell it what the duty cycle of the injectors is. Then one would assume an internal calculation.

Speed data will be direct from the road speed sensor. I say this because old carbed 1.4's etc got the trip comp as well.

Now if it was just EFi then the easiest way to do it would have been both from the ecu (speed and fuel) but the way they did it I imagine it the speed input will be a spur from the RSS wire. Its just a hall effect sensor.

the not used pin, how is it not used No trace or does it not seem to go anywhere? Perhaps the imperial/metric switch? There has to be a way to change them.

Pin 8. side light, do you just mean light feed as the minute the ignition is on its full brightness then only dims when the lights are turned on.

What pin have you got as pin 1 as they aren't labelled.

 

[Chet T16]

As you look at the back pin 1 is at the bottom

It would seem trhe imperial and metric units are different, theres no metric segments to display on the screen. How do you start the segment test?

I'll check out the light wiring, i wasn't too worried once i got it lit up.

I'll have to try emulate the speed and injector signal. In the absence of any way to tell I'll assume the fuel data is just switched the ground and the output from the hall sensor is a positive pulse. Pity theres no speed display, that would make things easier

For the fuel level the only way to get the level to change was to take out the power and reset it, it wouldn't update while powered. I wonder if it only samples per some distance to smooth it out or something

 

[Chris H]

indeed I just checked, there is no L or km/h on the test.

test is done by holding the reset and and scroll button then flicking the ignition on. Just as well I have big hands its not easy yourself.

the fuel gauge is an arse, if you fill it with the engine running it will eventually put the level up but if the light was on then it will stay on.

Just like it has to be topped up a minimum of a gallon to register.

if the lights on and you only put in a fiver it will still have the light on, put a tenner in and the level will be correct.

Of course if you put a fiver in then disconnect the battery and reconnect it'll be fine.

 

[Chris H]

annoyingly the display isn't like the golf mk2's or the later meganes where it shows various goodies.

 

[Chet T16]

The test is easier when its wired up on your breadboard :lol:

 

[Chris H]

indeed, you using a switch or just a screwdriver jammed in? :lol:

just looking at mine here. Surely as its an LCD then it will display only what its programmed to display, therefore litres etc would be put up with no issues?

2 boards and an lcd display its got to be a programming thing. No way is it financially viable to actually have to make 2 different types.

Is that a programming connection on the back of the unit between the bulbs with the hole in the casing?

Found a source for new LCD screens yet?

 

[Chet T16]

Proper switches! Although my ignition "switch" is a bit more pikey

The lcd can be swapped out, theres a six pin header to pop that off. That connection between the bulbs is on the lcd part so nothing to do with the programming of it.

I reckon theres probably a jumper on the board that tells it whether theres a litre or gallon screen attached which changes the maths accordingly. Haven't looked yet tho.

Found this but can't see the sizes anywhere its listed. Could also go full colour :lol:

 

[Chris H]

yeah I have had it apart.

i now see that is indeed on the display driver board.

no prices on that site.

Can change the colour of the stock one from orange if your carefull. However if you do that its no longer 80's!

Not sure if you have the stickers still on but heres the details on the one I have lying here.

L48 (thats a renault 21) ADAC V15 1029
SAGEM 21551290-0 G
RNUR 7700788455

on the bottom left of the main board

SAGEM
FT294V-0
L48

 

[Chet T16]

Googled most of that but nothing meaningful came up. I got the datasheet for the sagem lcd driver so i have the pinout for that 6 pin header but i've no real interest in trying to get that working, for now anyway.

Having a look at the board here, in this pic near the top middle theres an M with a resistor underneath and a KM with space for a resistor. To the right theres also a GB/US selector for gallons



That LCD can be picked up for under $15, probably a good bit less if you looked hard enough

 

[Wicked Neo]

I have neither a 19 with a trip computer nor a wiring diagram so if anyone has to mean to check or knows the deal with the speed and fuel flow data it'd be appreciated.

UCC has a digi dash or is it still at Stans?

 

[Chris H]

UCC has a digi dash or is it still at Stans?

what do you think...

 

[Chet T16]

What Chris said, and anyway thats not going to work anymore without the ecu

Speed pulse now working, At 500Hz i'm doing 222.9mph

 

[Chris H]

whats your mpg at that speed? :lol:

I have just pikeyed mine up, wires shoved over the pins :lol:

 

[Chris H]

also is it just me or at that speed on screen does anyone else think the wee car should do a wheelie? (yes i know its fwd)

 

[Neal R19]

I have nothing to add but... Awesome thread

 

[Chris H]

not to be outdone by Chet and his breadboard.

here is my pikey setup on my lap with a motorbike battery :lol:

 

[hooverphonique]

have to agree with Neal here

and btw, those are probably not resistors, but shorts (I guess you could call them 0 ohm resistors, if you insist

 

[Chet T16]

It appears thats renault decided 7.1mpg was the worst case scenario!

 

[Chet T16]

have to agree with Neal here

and btw, those are probably not resistors, but shorts (I guess you could call them 0 ohm resistors, if you insist

On the board? Yeah probably. I was expecting a blob of solder :lol: