Door marker light problem

If there's power at the socket, but no light, then I'd think your bulb is burned out. I had a driver's side door light problem that turned out to be the switch at the hinge (the bottom switch is for the driver's side). Very satisfying to have it back. It's those little things...

 

If your testing is at the bulb socket, only one wire should be hot and the other is grounded by the door switch when the door is open. If you are using a multimeter, your "hot" reading on the wire which is not actually hot is a false reading because the door switch is probably not grounding it and what you are reading is some feedback from the time-delay relay (the negative wire of the "open door" light and the time-delay relay are both connected to one terminal of the door switch and its other terminal is connected to the ground when the door is open).

Try pulling and wiggling the door switch plunger and the light may come on (if the bulb is good). Otherwise, to better test which wire at the bulb socket is live, use a small test bulb between each of the terminals and the ground, not a multimeter.

 

What he said above.

Test light would work better.

 

Interesting. Normally the time delay relay would be providing an earth. How would a multimeter coil resistance change that to a voltage? Different bias on a transistor in the time delay relay?

Work in progress...

F348 Door and Window Wiring Diagram

 

Thanks for posting the link. My 90 has similar problem on drivers door jam light. It will work but it shorts #3 fuse after a few weeks. Removing the bulb stops the short so I removed the bulb. Tracing the orange wire hot goes to #3 fuse. The ground hits a switch, then goes into the LID (whatever that might be, light timer I think) in fuse box.

Then there is some mumbo jumbo connection to door lock unit though tough to figure what part of the same circuit. My door wiring looks good on both sides of jam connector but the light switch on door baffles me, what is that an option switch?(on top left)

 

did you get that wiring diagram from your wsm? Seems more detailed than the 355

 

Just changed my door light the other week and agree it's better to have them working. Sharing from a past experience, I struggled with another car like your experience only to find the bulb was not the right one but left there by PO.

 

Yes, it's from the WSM (but I've added lots of stuff... colours, labels, etc). I do think the 348 diagrams in general are easier to read. I have a similar diagram for the F355, but I can't figure out the delay circuit (also a work in progress).

F355 Windows, Wipers, Interior Lights and Door Indications

Cheers
Ian.

 

Not sure which one you mean. What number?

Probably best not to hijack this thread, but start a new one. It could get complicated

Cheers
Ian

 

The driver side has two switches, the top one is for the open door buzzer (passes through the ignition key switch), the bottom one is for open door marker light and the dome light which is connected through the LIP relay.

The passenger side has only one switch, connected directly to the dome light and passenger door open marker light.

My issue is that when the driver side door is open, both the door open marker light and dome light do not light up. The buzzer works fine so that switch and wiring are fine. The passenger door side works fine -- both marker light and dome light lights up when the door is open.

I swapped the switches and open marker bulb from the working passenger side to the driver side, no luck. I tested the driver side marker bulb and the switch putting them on the passenger side, they work. So the switches and bulbs are fine.

From the wiring diagram, the only common thing that can disable both the open marker light and dome light on the driver side is the ground connection of the switch. Or, may be the LIP relay and the marker light wiring must both be at fault simultaneously to disable both. Any thoughts would be highly appreciated! Thanks.

 

I checked the 18pin connector, it looks good. Note that the dome light is also not reacting to the switch position, the dome light wire is independent of the for jamb connector.

Is your driver open door marker light working now? How did you fix your two hot wires situation? I just found my multi-meter, will do some tests tomorrow.

Thanks.

 

I don't have retractable seat belts. Mine is 89 348, so just have the traditional regular 3 point seat belts, no mouse track. So passenger side has only one switch and driver side has two switches. Top one is working for the buzzer, the bottom switch itself is working as I took the working one from the passenger side. Will check the timer somehow but the door marker light has nothing to do with it and is not working.

 

I fixed the driver side open door marker. The orange wire coming from the light was not attached to the door jamb connector, someone soldered it before which is not broken again. I wore was kind of short so I kind of jammed it tight into the pin hole for now. It works now! I attached pics of the switches, broken wire, and working light.

Second issue was the dome light was not lighting up when the driver door opens. So I removed the passenger footwall fuse box cover and saw the the the relay H is actually not there, attached a pic. I need to get that relay I think, from the manual the part no is ITALAMEC 0239100. Hope it was Bosch, not sure if I can find this one. I see some scratches of the relay pins around the holes on the panel, meaning that there was a relay before that someone played with and couldn't replace it because they never found it?

When I removed the fuse box cover, I saw a wire lying on the floor with a male connector on one end. See attached pic, any idea what that is?
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Ricambi list it (p/n 134448) at $79 but, if they don't really have it, you may have to go for this one Ferrari 348/348 TB/348 TS - Timer for Electrical Boards

The wire you showed is the radio antenna cable.

 

Thank you! I just ordered the relay from Ricambi, 134448. They don't have it in stock, said it will arrive on by this Monday, so will just wait.

Thanks for pointing the radio antenna cable! It looked familiar but couldn't remember where I saw it before. I will try to connect it to the stereo (Kenwood) though the radio reception was good.

 

What does the key light timer or steering wheel locking lighting do? What lights come on and when do they turn on and off? Thanks.