4200 Spyder Display issue

[Helipedia]

Sorry it didn't help, but it does eliminate that possible issue.

but I learned something new - and thats good! Thank you!

 

[Helipedia]

I reckon it’s one of the connectors on the back of the heater control panel. I don’t think the ICE unit does anything except display data from the HVAC panel.

Pull the ICE unit and try disconnecting the plugs in the HVAC. If you find one that has no effect that’s probably the output to the screen. Or you could be more technical and try and correlate wiring colours between the two.

All three heater control units are working in the background but it's not displayed what they are doing! The display stays frozen as the pictures show - nevermind what you are doing

 

[spkennyuk]

In the meantime I found ut the correct procedure:
the ignition on / off
temperature to "max cold"
middle knob to "auto" (we don't care about the fan knob)
press and hold the econ, and recirculate buttons
ignition on
both button LEDs start blinking
reset is done after blinkings stop

but unfortunately, it didn't help in my case! :-(

When you do the reset procedure if you look just below where the gear number is indicated on the main speedo cluster it should show a set of codes if there is a fault on the system.

From memory if it shows AA then 00 there are no errors recorded. Any other codes it shows make a note of and let us know. The codes are shown in 2 digit pairs 4 digits per code.

Post 9 on the link below gives you the list of error codes. Same codes apply to 3200/4200 and GS.

"Outside Temperature indicator | SportsMaserati.com" https://www.sportsmaserati.com/index.php?threads/outside-temperature-indicator.24781/

 

[Oneball]

All three heater control units are working in the background but it's not displayed what they are doing! The display stays frozen as the pictures show - nevermind what you are doing

What I was getting at is I reckon one of the 4 connectors at the back of the HVAC does nothing except feed data to the screen. The rest I reckon actually control the heating. So if you pull them one by one and the fan stops working or you cant turn the AC on, they don’t feed the data to the screen. The one of them that won’t have any effect will be just a data output and that’ll be the connector to look at. This is all purely guessing though as I’ve not seen a wiring diagram.

 

[spkennyuk]

Just thinking outloud. From memory on the 4200 when you switch on the ignition and the screen springs to life the basic info appears on screen but the temp and sat nav signal take a little longer to show correctly on screen as it is waiting for the sensors to wake up.
for example the sat nav icon stays grey until the gps antenna gets a lock and then turns green. The temperature stayed at zero i think iirc for half a second and then showed the cabin temperature.

The screen itself is only showing what the NIT in the arm rest tells it to show.

Which leads me to think that the issue is either an iffy connection either to or from the NIT or the cabin temperature sensor is broken or loose connection giving a bad signal to the NIT and inturn to the screen.

If it occasionally shows correctly then it could well be a break in the wire that sometimes makes a connection.

Another forum member (Dave ? Possibly) Did a lot of work on the NIT and its inner workings. Im sure matt or somebody will remember who it was and maybe shed some more light on it for you.

 

[spkennyuk]

As far as i can work out the internal cabin temperature sensor is located behind the small plastic grill thats below the air vent and level with the steering wheel stalks in the cabin. See the picture below.

If it is the sensor rather than a loose wire being the issue then the part number is 385500199. I think you mentioned that you had done a heater box / matrix repair in one of your posts so there is a good chance the sensor has been disturbed /knocked during that process.

Pictures below. Hopefully they will help resolve the problem for you.

 

[Helipedia]

Just thinking outloud. From memory on the 4200 when you switch on the ignition and the screen springs to life the basic info appears on screen but the temp and sat nav signal take a little longer to show correctly on screen as it is waiting for the sensors to wake up.
for example the sat nav icon stays grey until the gps antenna gets a lock and then turns green. The temperature stayed at zero i think iirc for half a second and then showed the cabin temperature.

The screen itself is only showing what the NIT in the arm rest tells it to show.

Which leads me to think that the issue is either an iffy connection either to or from the NIT or the cabin temperature sensor is broken or loose connection giving a bad signal to the NIT and inturn to the screen.

If it occasionally shows correctly then it could well be a break in the wire that sometimes makes a connection.

Another forum member (Dave ? Possibly) Did a lot of work on the NIT and its innet workings. Im sure matt or somebody will remember who it was and maybe shed some more light on it for you.

This is exactly how it works. In the startup process, it's a kind of "greyed out" for half a second, and then it shows the picture above. I am assuming that the cabin sensor is okay because the function itself is working, just the display driving me nuts. The display is getting all data via bus cable from the NIT - the cable is okay because I checked this during the heater core change. I wan hoping for a more easy sollution! :-(

 

[Helipedia]

When you do the reset procedure if you look just below where the gear number is indicated on the main speedo cluster it should show a set of codes if there is a fault on the system.

From memory if it shows AA then 00 there are no errors recorded. Any other codes it shows make a note of and let us know. The codes are shown in 2 digit pairs 4 digits per code.

Post 9 on the link below gives you the list of error codes. Same codes apply to 3200/4200 and GS.

"Outside Temperature indicator | SportsMaserati.com" https://www.sportsmaserati.com/index.php?threads/outside-temperature-indicator.24781/

AA 00

 

[spkennyuk]

AA 00

Thats no fault code. Its a weird one this. I think it may have been @davidhowson that did a lot of work on the internal workings of the NIT.
Hopefully he can if i have the right person shed some light on it.

The only thing that makes any sense to me is that the internal cabin temperature sensor is working but isnt sending the correct canbus data to the NIT and in turn to the display.

I cant see it being an expensive part 2nd hand. Might be worth seeing if any of the 2nd hand parts suppliers have one that you could use and see if that cures the problem for a small amount of £s it may be worth taking a punt.

 

[TimR]

I think it may have been @davidhowson that did a lot of work on the internal workings of the NIT.
Hopefully he can if i have the right person shed some light on it.

I think you're right ! He helped me with an NIT issue when I first got th e car

 

[Helipedia]

It would be interesting where the signals of the 3 rotary control go! Directly to the NIT or somewhere else (a kind of a HVAC control unit) and afterwards to the NIT?

 

[Gooner]

I don’t think they go to the NIT first, because I have completely removed my NIT and replaced it with a Pioneer ICE system. I can still adjust the fan and the temperature with the controls and turn on the AC. I also connected a 7V feed so the controls light up as well.

 

[Helipedia]

I don’t think they go to the NIT first, because I have completely removed my NIT and replaced it with a Pioneer ICE system. I can still adjust the fan and the temperature with the controls and turn on the AC. I also connected a 7V feed so the controls light up as well.

good hint!

 

[Helipedia]

I am back and the situation is still the same but I noticed some points which could be important. Every time I started the motor during the wintertime (subzero or close to) the display worked as it should. Today I used the car to go to work and it had -2°C - I also noticed that the outside temperature in the center didn't show up - saw just "-- -"! The climate control icon (snowflake) next to the outside temperature was blinking for a while.
Could the sensor in the mirror or the wiring cause the fault in my climate display?

 

[safrane]

The snowflake is nothing to do with the A/C, it is the indicator for Ice Warning.

The -- -- indicates a fault with the temp sensor. It could be the mirror housing one of the heater one.

The diagnosis you did in post #18 should also show up any error codes in the centre display

 

[Helipedia]

The snowflake is nothing to do with the A/C, it is the indicator for Ice Warning.

The -- -- indicates a fault with the temp sensor. It could be the mirror housing one of the heater one.

The diagnosis you did in post #18 should also show up any error codes in the centre display

Snowflake - ice - got it.
The outside temp returned after some kilometers.

Question: If you turn on the radio without ignition by pressing the volume button, is the climate section greyed out (like the picture in my initial post)?

 

[safrane]

I believe so, it only comes on with the ignition key turned to MAR

 

[Helipedia]

I belie so, it only comes on with the ignition key turned to MAR

So it could be that the display doesn't "know" that the car is running/ignition on

 

[Oneball]

The temp sensor in the mirror is cheap and an easy change (assuming you don’t break the mirror glass) got to be worth a try.

 

[Helipedia]

Definitely the next thing I will try...