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we looking forward to your results. Thank you
New 2021 S/V90 taillights
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I have the light.
Not sure if I have time to install it. I only have very basic tools at the condo and not much time.
Even though parts catalogues seem to indicate the same harness. I believe the blinkers are only on the external light in the older model (at least US version) where the new one blinks in the tailgate section also. I don't really get how that works.
Not sure if I have time to install it. I only have very basic tools at the condo and not much time.
Even though parts catalogues seem to indicate the same harness. I believe the blinkers are only on the external light in the older model (at least US version) where the new one blinks in the tailgate section also. I don't really get how that works.
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I also have the new s90 facelift taillights, just dont know how to install it. Lol. Looking forward for instruction
Before I put mine I need to look further in the parts
The wiring harness appears to be the same but since there is no flasher in the inner section I am thinking the controlling modules are different..
Some research point to LIN protocol after 2021. That would mean it only needs one wire for signal (command) and the power/ground instead of a wire for each signal. Volvo might have used the same large wiring harness with plans to reduce it later.
Reading about LIN though does not give me great confidence in the swap!
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Your success would likely pave the way for several people (myself included!) to make the swap as well. I would be doing it on an S90 but still - I anxiously await your results!
Just checking in to see if any progress has been made with finding out compatibility with the swap!
I read a lot but did not do any tests.
I am 95% confident they cannot be swapped and would need a custom module. I have seen a site that sells a module to use late gen Mercedes tails on an older one and they have a module to convert the standard 12V signals into the LIN code.
And for now even the test/programmable module is out of stock due to chip shortage.
So after some further checks with precious help from @Tech I found out it's not the same harness. The harness for the LIN new lights is much cheaper ($84 instead of $212) which indicates there are probably just a few wires heading to the lights compared to the older one.
That leaves with option 2, which is to take the 12V standard signal, get it into a board like Arduino and output the LIN command.
The only way to do this would be to have the circuit board where all the harnesses connect to (central module) in order to feed the LIN data line to all lights simultaneously. This is quite involved. I've seen it done on Mercedes where they sell a box to be able to plus and play the new lights, but this is a complex project.
I have bought a LIN logger and some other tools to act as master and control my light, little by little I'll show my progress.
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1,109 Posts
Ack.
If its digital all the way to the light assemblies, then I am out.
I'll make custom wiring harnesses all day long if I have to, but I am not going to reverse engineer bus logic and create an arduino or other wrapper for it.
Even if you figure it out, It will be an absolute nightmare to make sure it is reliable and doesn't mess things up on the data bus.
If it is anything like the GM CANBUS a friend of mine developed an ipod integration kit for SAAB 9-5's and 9-3's for years ago, one little mistake and instead of skipping a track, you are deploying an airbag...
I mean, if an off the shelf product (by a well respected engineering firm that can validate to safety standards) were to become available, I'd consider it, but short of that, I'm out.
I mean, this generation of cars are too complex with too many unnecessary moving parts anyway. They will become too expensive to keep on the road in any shape where you'd actually want to drive them long term anyway.
Once mine is paid off, and the extended warranty I bought expires, I'll probably sell it for pennies on the dollar and finance something new (to me). Probably electric. Maybe a Polestar?
There just isn't enough ownership time left to warrant that kind of effort.
I would not play with anything in the bus.
I would take the analog signals (individual wires) and get then as inputs to convert each to a different LIN command to send to the lights.
Unfortunately I am finishing renovating my cottage and have zero time for it
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I would take the analog signals (individual wires) and get then as inputs to convert each to a different LIN command to send to the lights.
Unfortunately I am finishing renovating my cottage and have zero time for it
Sent from my Pixel 6 Pro using Tapatalk
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83 Posts
If only these were cheaper, I'd totally go for it.
In my mind, simplest would be splitting the new lights open, and driving the LED circuits as needed, with input wires from the car and making the appropriate LED driver circuits. Once inside, the plain LED layouts are available past the LIN controlled modules. Fancy animations and sequences would be optional. I've got a complete spare set of 2018 tails split open already waiting for cool mods, cutting taillights open is trivial work.
This car is picky with expecting exactly the original incandescent bulb and LED loads, I found this while making my LED pods for reverse, and rear fog. Simple load resistors did not clear the errors as easily as on other cars. Also had to use trigger signals to draw battery power through a relay (I used solid state mosfet relays), just piggy backing a new LED array directly from the reverse and rear fog wires was causing bulb check errors due to the added current draw.
So if brute forcing these new tails onto pre-facelift cars is gonna happen, the stock lights (or rather just the guts) would need to remain connected to keep the error checks happy. Just stuff the original circuit boards behind the trunk side panels and the car won't know any different.
In my mind, simplest would be splitting the new lights open, and driving the LED circuits as needed, with input wires from the car and making the appropriate LED driver circuits. Once inside, the plain LED layouts are available past the LIN controlled modules. Fancy animations and sequences would be optional. I've got a complete spare set of 2018 tails split open already waiting for cool mods, cutting taillights open is trivial work.
This car is picky with expecting exactly the original incandescent bulb and LED loads, I found this while making my LED pods for reverse, and rear fog. Simple load resistors did not clear the errors as easily as on other cars. Also had to use trigger signals to draw battery power through a relay (I used solid state mosfet relays), just piggy backing a new LED array directly from the reverse and rear fog wires was causing bulb check errors due to the added current draw.
So if brute forcing these new tails onto pre-facelift cars is gonna happen, the stock lights (or rather just the guts) would need to remain connected to keep the error checks happy. Just stuff the original circuit boards behind the trunk side panels and the car won't know any different.
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3 Posts
some new progress with tail lights ?
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any advance my friend?
2023 V90 T6 Recharge Ultimate with in Thunder Grey with Blonde Nappa
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So I’ve got a 23MY V90 T6 Recharge Ultimate. The rear blinkers are a bit more advanced than I thought. The only scroll when the blinker for that side is activated. With hazards, lock and unlock they blink of and on like non scrolling do.
The lights get a different LIN signal for each function. That part would likely not be replicated because the signals come from the CEM... pre-LIN only have independent 12V signals for each light so you cannot tell the tail between a blink and an unlock or hazard.
Even opening animation might be tricky, having to fake it the first time you get power and then not use that signal until next power-up.
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