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2018 Forester XT Limited CVT
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Discussion Starter #1 (Edited)
Has anyone physically disconnected Subaru one-touch lane change in the vehicle wiring harness for the 2018 Forester (in particular the 2018 Forester XT)? If so do you have the schematics and any other required documentation? I need to disable the Subaru one-touch lane change so I can change the number of blinks for the one-touch lane change.

Here is a link to the aftermarket blinker module manufacturer's help page on modifying the wiring harness:

TapTurn Convenience Signaling for your car
 

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2016 XT Premium
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Get an electrical multi-meter, find the applicable harness coupling, and start tapping the turn signal stalk to test individual wires until you find the right ones. Even if someone described the correct wires you should test them in this way before cutting them to install the TapTurn unit

For those who are curious the TapTurn modules allow one to use fancy hazard light patterns, have the car use 5-blinks instead of 3 for the one-touch turn, and other little lighting customizations
 

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Discussion Starter #4
How many blinks are you wishing to change it to?
I'm going to change it to 4 blinks. The capability is there because I have an aftermarket blinker module, but I just have to disable the car's built-in one-touch signalling to prevent it from overriding the aftermarket module.
 

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Discussion Starter #5
start tapping the turn signal stalk to test individual wires
I have all the meters and tools, just need to know what the functions of each wire are so I can find them.

The TapTurn allows the number of blinks to be selectable from 3-6. I might have read somewhere that some Subarus can do 3 or 5 stock.

If it's too difficult or costly to find a schematic/documentation I might need to go to the dealer and get them to disable the one-touch using their select service monitor.
 

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2016 Forester
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You can't, it's part of the body control module programming, so dealer is the only way.
 

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You can't, it's part of the body control module programming, so dealer is the only way.
Not with that attitude... lol

The TapTurn for sure works without the dealer, they specifically state that it does in the link posted by the OP, which is being ignored. The way it works is by intercepting the user input signal from the stalk on the steering column, BEFORE the signal gets to the control module, the TapTurn unit takes over to perform the same function, just from a different microchip.

The instructions provided are enough to believe that it works without going to a dealer, but not specific enough to give the right information to get in there and do it, which must be frustrating.
 

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Discussion Starter #8 (Edited)
The way it works is by intercepting the user input signal from the stalk on the steering column, BEFORE the signal gets to the control module
Originally I read the TapTurn manufacturer's instructions quickly and in my brain I thought they were talking about a DPDT switch, so you could choose to feed two wires from the stalk to either the BIU or to the TapTurn. But after reading the instructions more carefully, the TapTurn seems to detect Subaru one-touch signalling, and will slave to it if it is detected. But by cutting the wires, the TapTurn will not detect the Subaru one-touch signalling, and it will go ahead and blink the lights according to the settings the user selects. Reconnecting the wires will again allow the TapTurn to detect Subaru one-touch signalling.

I don't know whether or not the Forester harness is similar enough to the Crosstrek harness to follow the example on the TapTurn Subaru support page. I did pay for a 3-day subscription to the service manual for my 2007 Forester long ago, but haven't done that for my 2018.

I don't want to cause any warranty problems for the electrical system by cutting wires. But if I ask the dealer to change some settings, and they ask why I want those settings changed and I tell them I have an aftermarket blinker module, they may record the aftermarket part in my car's record, which may also cause extra scrutiny if there is an electrical problem.

I see that I can turn the TapTurn one-touch turn signal OFF, so I can go to the dealer and tell them to change the setting, and when they test it afterwards there should be no one-touch signalling happening. But if they press a button or move a stalk and activate some TapTurn feature that is different from stock, like the arrival/departure lighting comes on, they may clue in that I have an aftermarket blinker module. And aftermarket LED bulbs.

I'm going to email my local dealership that I bought the car from (I bought the car in April 2018), and say that there was a setting I wanted changed that we forgot to ask for when I picked the car up new, and ask if they can make the change now. I'll ask if the Subaru Select Module is a tablet thing that they can just bring out to the parking lot and use, or if they have to take the car back into the shop. Hopefully they can just send a tech out and make the change in the parking lot without any documentation being created.

Has anyone ever seen the Subaru Select Module? Is it just a little tablet thing that they can carry around?

EDIT: I guess I could put the stock blinker module back in and then go to the dealer and ask for the setting to be changed. If I did that, the only modification the dealer might see is that I have LED bulbs installed everywhere. Hopefully LED bulbs wouldn't cause any warranty problems. And swapping the blinker modules back and forth seems like unnecessary work because I don't think a blinker module would cause any damage to the car so it shouldn't cause any warranty issues.
 

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Not with that attitude... lol

The TapTurn for sure works without the dealer, they specifically state that it does in the link posted by the OP, which is being ignored. The way it works is by intercepting the user input signal from the stalk on the steering column, BEFORE the signal gets to the control module, the TapTurn unit takes over to perform the same function, just from a different microchip.

The instructions provided are enough to believe that it works without going to a dealer, but not specific enough to give the right information to get in there and do it, which must be frustrating.
Sure if you want to start hacking the wiring harness of a still under warranty vehicle, more power to you.

I have tapturn too and it took dealer 10 minutes to turn it off, a much better way to me.



@Botnik You don't need to tell the dealer anything, the owner's manual says if you don't want the one tap lane change, you can go to the dealer to turn it off, and that's what you tell the dealer.
 

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Discussion Starter #10
You don't need to tell the dealer anything, the owner's manual says if you don't want the one tap lane change, you can go to the dealer to turn it off, and that's what you tell the dealer.
The service manager at this dealer once told me they would charge me to read a code, but they ended up not charging me because they were doing other work (timing belt) at the same time. (The code was "small evap leak" and they didn't find any problem, might have been the 11-year-old fuel cap not sealing or something.) So a few minutes ago I sent the service advisor an email asking about this programming change, saying that there was a configuration option that wasn't done when I picked up the car.

I also asked about the fuel smell in the passenger compartment, and whether there are any TSBs for my VIN. I hope he replies tomorrow.
 
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