Animated tail lights - project opportunity

[mystermykee]

Well, I've spent about the last month trying to get this to work. Here's where I currently stand.

Wired all 4 tail light pin 3s to the BCM2 C5 LIN on black 32pin connector (same bus as the kick sensor/siren, which both work fine). Coded BCM2: all four IntelTailLight bits = installed, can_lin_signature_routing = active, and even ported the MY25 light channel dataset (7202) into my gen1 coding — car took it all.

Results so far: BCM2 is definitely polling the lamps — I get 4 active "tail lamp no signal" faults that won't clear, and PIWIS now shows Rear Light Left/Right 1/2 UDS nodes plus per-lamp coding records (all unreadable since the lamps don't answer).

So software side is done and verified, lamps just won't talk (unless there's something else I'm missing). I'm beginning to think the gen1 lamps didn't actually ship with the necessary hardware to do such animations, even though they have LIN connectors.

9JA:945.081. 05.10.2023
GEN LEVEL: 03S
SW:2SD.2668
HW: H05
2SK 015.387-60
Z Leuchtenband ECE Exclusive
LAMP ASSY REAR ECE TG T2 PORSCHE J1 EXCLUSIVE

And if I click into one of the rear light UDS modules....nothing.

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[mystermykee]

I've also inquired about the .2 ECE/ROW taillights sets and the two places I've called don't have an in stock date from Germany listed--my guess is all the ones they have are going onto new builds.

 

[whitex]

Wow, you sure pushed this forward quite a bit! NICE!

Have you tried probing the LIN bus to see whether the BCM is initiating any LIN bus transactions and if there is any activity and/or any attempt at response from the lights?

 

[mystermykee]

Wow, you sure pushed this forward quite a bit! NICE!

Have you tried probing the LIN bus to see whether the BCM is initiating any LIN bus transactions and if there is any activity and/or any attempt at response from the lights?

No, only have a DMM on it so far, which shows the bus idling 9-12V at my tap but obviously can't show frames. Unfortunately, I don't have an analyzer tool. Indirect evidence says the BCM is polling with the intelligent tail light bits coded, BCM2 sets four active "no signal" faults that won't clear. That's it timing out on response slots for all four lamps. Kick sensor and siren on the same LIN work fine, so the master side is healthy.

 

[whitex]

No, only have a DMM on it so far, which shows the bus idling 9-12V at my tap but obviously can't show frames. Unfortunately, I don't have an analyzer tool. Indirect evidence says the BCM is polling with the intelligent tail light bits coded, BCM2 sets four active "no signal" faults that won't clear. That's it timing out on response slots for all four lamps. Kick sensor and siren on the same LIN work fine, so the master side is healthy.

When I was probing my Euro lights, there were pulses on the LIN pin whenever I applied turn signal voltage for example, so that would tell me those are not disconnected altogether inside the light. Is it possibly that the CAN addressing is different? It should be possible to scan the LIN bus of the tail lights for all 64 addresses see if any of them respond - you'd do that out of the car.

 

[PCASSOO]

WOW, I feel like I missed out on a lot of Brain Upgrades when I was being made. Lol
I can do and make a lot of things but this is way over my pay grade...
I have my factory middle taillight sitting in my garage and want to do something with it.
Any suggestions??
I've tried hooking up a 12v battery to some of the pins and I've not found a sequence too light up the full light bar.
Any suggestions on how to do that??
I totally appreciate Any help with your bigger brains.
Thanks David

 

[whitex]

I've tried hooking up a 12v battery to some of the pins and I've not found a sequence too light up the full light bar.
Any suggestions on how to do that??

If this is a J1.1 car (your profile shows 2020 Taycan, so yes), see the pinout for the 2 central tail light connectors in post #1 of this thread, connect GND (pin 1 on both) to the negative terminal of your 13V supply, then connect 13V to the other pins corresponding to the segments you want to light up.

So if you just want the full bar, make the following 4 connections on the center light bar:

• 6-pin connector
  • Pin 1 to GND (-)
  • Pin 4 to +13V
• 8-pin connector
  • Pin 1 to GND (-)
  • Pin 4 to +13V

So only the 4 pins connected.

 

[PCASSOO]

Ok Thank you very much.
I will try this in the next couple days. I appreciate all your help.

 

[mystermykee]

When I was probing my Euro lights, there were pulses on the LIN pin whenever I applied turn signal voltage for example, so that would tell me those are not disconnected altogether inside the light. Is it possibly that the CAN addressing is different? It should be possible to scan the LIN bus of the tail lights for all 64 addresses see if any of them respond - you'd do that out of the car.

You might be right. This is just conjecture, but the TSB calls for programming of the BCM2, which likely includes a step to get the BCM2 and the taillights talking to each other. I'm in the process of building my own LIN analyzer/breadboard/arduino. With the intelligent tail light bits set to active, I'm getting defective tail light errors, which means the BCM2 is polling, but not getting anything back.

"The values must be checked or set initially before writing them..." Leads me to believe this is done as part of the programming.

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