355 Parking brake light out and HVAC climate lights.

Is your HVAC panel plastic just turning yellow and cutting down the light transmission?

I'm assuming you've tried adjusted your instrument dimmer knob? (on the tachometer). Lighting power from fuse 12 in the forward luggage compartment goes to the tachometer dimmer potentiometer then, via splices, to all the other instruments/panels. If you have a high resistance between the dimmer and the HVAC panel, it could affect the brightness. If you can find a yellow-red wire on the dimmer, do a resistance check between that and the HVAC panel pin 2. Or, if you have already reinstalled your instrument binnacle and hooked up all your binnacle wiring, check the voltage at pin 2 of your HVAC panel plug and a good earth with your ignition on.

This diagram shows the pin configuration of the HVAC panel.

HVAC Wiring Diagram (F355 2.7)

The park brake light is probably, as we discussed earlier, a faulty handbrake switch.

Hope this helps.

 

Just to clarify using part of one of your excellent photos..

Find the instument binnacle plug socket which corresponds to pin 2 shown in the photograph.


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... and then check the continuity of the wiring between that socket and pin 2 of the HVAC panel plug.

It's probably easier to do a straight voltage check on the HVAC panel, though.

If your panel lighting is generally dim and your dimmer seems to be adjusting brightness, then perhaps you could clean and check the points shown in the photo and also (edit) pin 1 in the photo.

 

Sorry, I think I've lost you. The HVAC and brake light problems are unrelated. Don't confuse panel and instrument background lighting with warning light illumination. The warning lights are not powered by the same power source/fuse as the instrument background lighting and don't use the dimmer .

 

Light not working on tachometer? Which light?

Exact location of what?

 

Because you have one of those cars which sits between the early 2.7 and 5.2 cars, it's difficult to know what powers the park brake light (no wiring diagrams available). Some of these warning lights share a power source, but I'm not able to say which lights on your car share a power source, so it's hard to narrow down the problem to power or earth issue. For info, most of the warning lights are powered by fuse 25 in the passenger footwell. Generally, if all the other warning lights are working, then it's probably not a power problem, so I'd start checking the handbrake switch.

With your HVAC problem, if your binnacle wiring is all back together, just go straight to the voltage check at pin 2 on the HVAC anel.

 

For the HVAC panel, look towards the bottom right hand side of the diagram. There is a graphic of the panel and above that, the HVAC panel wiring, including a rectangle with a green dot next to it. This shows the plug socket numbering.

If the harness feeding the HVAC panel has visible wiring colours, you don't need to worry about the numbering. Just check the voltage on the yellow wire (with red stripe). Use the socket with the black wire on it as an earth for your other voltmeter probe.

Sorry.. had to make a few edits in this message... Too many late nights..

 

Can someone else with a 2.7 USA car confirm that the park brake light illuminates during engine start with the park brake off?

 

No takers? (or too many sore heads after 4th July celebrations? )

 

I have a '95, and my parking brake light on the dash was not functioning when I purchased the car. The part number for the switch was not indicated on my bill, though I believe that it is item number 9 at ricambiamerica, part number 114318, Switch.

Also, I verified that my parking brake light does not illuminate when the key is turned to the on position, unless the parking brake is engaged.

 

Thanks Craig. I'm still not sure if I have to remove a line in my diagram that I thought I had to add for USA 2.7 cars. I think it may be triggered by start, instead of run.

 

Alex, did you confirm that your park brake light currently does not work when the car is started with the handbrake off? If we can get someone to confirm that the light is supposed to illuminate during start on a USA 2.7 car with the handbrake off, then, if yours doesn't illuminate, it's not the switch that is faulty.

 

No, Craig said it did not come on in ON (RUN). We still need someone to confirm that the light does not come on in START with the brake off.

Some lights do not come on in ON, but do come on during START. e.g. in theory, the brake system warning light should come on during cranking.

(EDIT: I can't explain why your photo shows the brake system warning light illuminated in ON... I assume that's what your photo shows)

 

The brake system warning light [BRAKE] responds to front brake wear, low brake pressure and low reservoir fluid levels. If I remember correctly, the pump should begin to run in ACCY, so perhaps the light remains illuminated in RUN if you move from OFF to RUN quickly (before the pump has built up pressure). It should extinguish fairly quickly. However, according to the diagram, the light should re-illuminate during start because of the relay in module 06625 (Brake, Seat Belt and Door Open Warning Module).

 

Confusing. Here's the message that made me add an extra wire in my diagram for USA drivers:

DaveRocks has a (later model) USA 355F1, and he says it lights up on start. Unfortunately, he's not available for further comment at the moment.

https://www.ferrarichat.com/forum/posts/146020847/

Perhaps we have a different definition of START or later models are different.