I've been dealing with some electrical issues with my berlinetta turn signals specifically the left signal is stuck on. I can't get in contact with John in ri. And was looking for as much help as possible.

 

Oh boy, have I dealt with those. You need to take off the left hand pod and clean the contacts and perhaps replace or refresh the switch.

There is a tiny T15 ish torx bit screw that holds the pod onto the dash underneath the pod towards the back with it fully extended, remove that and the pod slides out completely. Disconnect the wiring being very careful not to damage the wires or the retainers. With the pod removed and disconnected, you can service the delicate electronics within, but use only electronics duster or electronic cleaner to service the components. The turn signal switch has a couple of spring contacts that can be gently bent back into position once cleaned, but it takes an exceptionally steady hand and tiny pair of pliers. The sticking you encounter is due to those contacts sticking and the springs being worn.

I have never found a replacement pod, so be very careful in servicing these parts on the 84. These dash boards were only built that way for one year before they realized that it was a service nightmare. If you need detailed assistance, bring your car to my shop.

 

I've actually desoldered both contacts cleaned them & recoated them with graphite. I kinda forgot to say all that I've done so far that being

1. Cleaning & coating the turn signal contacts 2. Testing for voltage coming from the turn signal switch to the board In this case the voltage changes when the button is pressed, 5 to ground back to 5. Which seems to be correct function

3. Swapping the 2/3 small components highlighted in the board picture below.

4. Shorting the tan turn cancel wire to ground ( which yeilded no change in the voltage)

The exact issue is when the key is on (or the car is running)
The left signal flashes constantly. The right signal ignores all inputs, hazards work as normal. Holding down the up button (or left signal contact) makes the light flash erratically, both lights flash or stops the flashing from the left signal entirely.

I've tested the board itself and voltage is getting to the chip on the board and coming from it to the relay turn on line on
I've got two current conclusions

1. That line is never being told to turn off by something outside the board
2. The part of the light board that is responsible for telling the chip to stop outputting power is faulty ( something I could fix if I knew what the circuit on the board was)

​​​​​​Thats all I can say for now if you have questions please ask the more heads on this the better my luck.

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I've already done quite a bit of diagnosis work. I got my hands on a factory service manual that includes the specifics for berlinetta (thank god). But based on that the turn signal circuit seems to work as follows. Voltage comes in through the turn signal switch ( the weird one with the switch on the dash ) and goes through the contact, The computer is constantly 5.3ish V & when you press the button down it shorts the circuit to ground the light module detects the ground & where it was from, then changes the state of what you pressed (turn signals in this case). From there I'm a little fuzzy but it looks as if the turn signal switch in the column shorts to ground again which opens up the circuit closing the system thus turning off the lights.

From this I've concluded two potential issues

1. The Light Module is dead
This being my least confident answer to the question as there is no other issues with the board everything else works as normal. I am capable of replacing parts on this board but its a real pain.
The board itself is receiving the voltage which makes it to the chip & it is getting sent to the relay ( what I believe correctly ) just not under the correct conditions.
If someone has a pinout of the chip of the light board please let me know
2. The board is not receiving the "turn off signal"
I haven't been able to test this at all because haven't been able to find out how that signal makes it to the board.


I'm sorry the original post was so vague I created another post about a week ago and was frustrated with the lack of info/help.
Regardless the switch itself I dissembled, cleaned & recoated the contacts. Its very unlikely to the the switch itself unless I'm missing something.

 

@NosTaco

Would you be able to post some photos of your turn signal wiring from the service manual, please?

I will review it when I have a moment.


Thank you.




Braven

 

Here is two versions of the diagram & the description in the manual.

 

@NosTaco With the ignition on and no signal lights enabled, could you please check the voltages of these five wires and report back with your findings.

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Worst case scenario, I can design you a replacement circuit board.

https://bravetech.ca/

 

I'm assuming you want me to probe that wire and then to a ground? How exactly do you want me to check voltage. The signal light is stuck on so I can't check them with no light on.

As for creating the board I know that if this was done a lot a berlinetta owners would rejoice. I'm far from the first to have issues with that POS board.

 

Yes, please use a voltmeter to probe the 5 wires. Connect the black probe to ground and use the red probe to test the wires. Please note and voltage fluctuates or abnormal behaviours.

Sorry for the confusion. When I asked for you to test the wires without the turn signals enabled, I meant (do not have the turn signal lever/switch engaged in any direction). I understand the left signal is always flashing. I'm trying to diagnose where there issue is originating.

.... But now that you mention it, while you're at it, please probe all 5 requested wires and record there voltages with detailed notes. Let's do this 4 times.

1. The first round of tests will be with no turn signal lever enabled. Record the 5 voltages.

2. Engage the turn signal lever for a left turn. Record the 5 voltages.

3. Engage a right turn signal. Record voltages.

4. Engage hazard lights only. Record voltages.


I apologize. I know it sounds like a pain but I need to collect as much data as possible to find the pattern.


I'd be happy to design a new board, if it's faulty. I'd need some assistance on your end to ensure the replacement fits and functions perfectly.

I just designed a bluetooth enabled Pop-Up headlight control module for a client. It's a direct plug and play replacement that can also be controlled by an app or remote control.... Just for fun.

 

Sure thing I'll take a look in the morning
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Here's where we're at, it's very difficult to get reading right as the change occurs because it's just me but obv there is a difference between left & right. With 0v on the green white wire but all 5 lines at 5V with the switch other way.

Fyi Im color blind so I checked all of these wires for continuity from the switch to the board connector. Makes it easier to figure out what's what


Edit : unplugging the turn signal control board & colum turn signal shut off switch doesn't affect the light it stays blinking.

 

So I did some more probing directly on the board and I'm fairly confident the CPU itself is dead the voltage is grounding out at the chip but it just doesn't react.

Unless the CPU requires multiple inputs for the output I'm calling it there. If your interested in designing a board Iwl would definitely help I have come electrical / programming experience, I would definitely need to brush up on it but it's not impossible. I had originally planned to create my own board using a Arduino & a lot of screwing around.

 

Okay.

The new board would be an upgraded replica of the original. I would handle the circuit design and programming.

I'd need a spare circuit board, so I could get the dimensions and contact placement correct.

Before we proceed, do you have a ballpark idea of your upper budget for this project?

I'm happy to design it for you but perhaps it would be more cost effective to find a replacement OEM board.

 

What you you reckon something like that would cost? If I I paid for it would I be able to produce and sell them? From what I hear it's very difficult to aquire good condition old boards.

Other than that would it be possible to manufacture just the chip itself? In my case I reckon I only need the chip.

 

I try to be as reasonable as possible.

Typically, if a client hires me to design an item that I could sell to other customers, I will only charge for a small portion of my time and design costs. This price would be similar to what I would likely charge other customers for the finished product.

​​​​​You would receive a module and I would continue to sell the new item, to help cover the remainder of my designs costs.

If the item is unlikely to be purchased by other customers, I would have to charge the full price of the design.

Something like this would likely be around the $250.00 USD mark, if there is a market for me to sell additional modules.

​​​​​Otherwise, the full design cost will be around $1000.00 USD


I believe it's possible for me to program a new controller for your existing circuit. I'd need to take a good look at the original circuit board and map out the circuit requirements. I may need to make a custom adapter circuit, though.

 

Do you have a better way to communicate so we can discuss this in more detail?

 

Absolutely,

If you have Facebook, you can direct message me. Just search for Bravetech Custom Electronics

If not, my email is: bravendirk@gmail.com

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NosTaco where did you end up getting that manual? I'd love to find one for my 85

 

P.O had it in his house me & a buddy were on clean up and so it ended up in my hands with the car. I think John in ri may sell them otherwise if you need anything I'd gladly send pictures.