TapTurn supports Subaru One-touch signaling
Many new Subaru's now come with One-touch signaling as a standard feature of the car. TapTurn is engineered as a slave processor to the Subaru signaling system controlled by the car's Body Integrity Unit (BIU) module. TapTurn is perfectly compatible with Subaru One-touch signaling and retains all the car's safety features that are integrated with signaling such as Eyesight and lane change departure warning.
After installing TapTurn, Subaru One-touch signaling remains usable and stays in effect with its 3 blinks until you decide to switch and use TapTurn's convenience signaling instead. TapTurn stays undetectable in stealth mode allowing Subaru One-touch to work as designed which is important for dealer diagnostics of safety-related systems. While Subaru One-touch is enabled it overrides TapTurn convenience signaling.
If you want to use TapTurn's finer precision and control and wish to change convenience signal blink count (features vary by model) the Subaru One-touch system must be disabled. Switching control between Subaru One-touch and TapTurn is done leaving TapTurn installed - there is no need to unplug and re-plug flashers if you use either of the following methods:
Method #1: Disable One-touch using SSM tool
This method is the most preferred way for disabling Subaru One-touch so TapTurn can take over its function. Disabling Subaru One-touch feature is done at the dealer or any auto shop using Subaru Select Monitor tool (or equivalent) through the diagnostic port. Doing so immediately enables TapTurn's convenience signaling and blink count setting. Subaru One-touch can be re-enabled later following similar steps in reverse and this will put TapTurn back into stealth mode.
Here's a sample page from 2015 Subaru Crosstrek XV manual discussing this setting. Have service change "One-touch Turn Signal System Setup" setting to "Support" and "OFF":
Copyright Subaru of America.
Method #2: Physically disconnect Subaru One-touch
This method is for those who want to skip the dealer visit or don't have easy access to an SSM tool. Physically disconnecting Subaru One-touch guarantees TapTurn will remain in control of convenience signaling regardless of Subaru One-touch settings. While TapTurn is controlling convenience signaling the car's safety systems continue to detect signaling as if Subaru One-touch was providing it so everything continue to work fine.
Cutting two wires under the dash separates BIU control of TapTurn so it becomes unaware of Subaru One-touch. This also immediately puts TapTurn into control of convenience signaling and permits changing blink count setting if applicable (varies by model). The cut operation is reversible. Rejoining these two wires with the BIU immediately restores Subaru One-touch function.
For the Crosstrek example, refer to step 3 "Check Harness" in the table. Two wires needing to be cut are found at the Body Integrity Unit connector labeled "B". This module is under dash near the steering column. Wires at pin# 21 and pin# 9 on the large connector B are snipped leaving enough of a "pig tail" for later rejoining if necessary. Tape all wire cut ends to prevent shorting on metal chassis parts.
Optionally, mount a DPST (double pole single throw) ON/OFF toggle switch under dash connecting these two cut wires in parallel through the switch. Closing the switch puts TapTurn into stealth mode and Subaru One-touch goes into effect making the car ready for dealer visits and diagnostics on safety systems. Opening the switch later puts TapTurn back in control of convenience signaling.
NOTE: Different Subaru models and years may use different wires and pins on the Body Integrity Unit - consult the correct manual for your car model and year before cutting any wires!