JamesM9794
Junior Member
Hi All, I have a question about the automatic shifter wiring and how it communicates with the PCM, for a bit of an odd reason.
I'm trying to build a plug and play Bluetooth mod that taps into the aux audio input, and I need power for the Bluetooth board. Because I want it to be plug and play, reversible, and hidden, that precludes just plugging something into the 12v power point and aux plug in the center console, and also precludes cutting into the 12v power lines. I'd also like it to be switched power so it's not constantly draining the power, and the 12v power points stay on when the vehicle is off, so again that precludes the 12v power point.
Hopefully that context helps explain the question(s) I'm about to ask.
On the 2013 the automatic shifter, the plug (see diagram) has a 12 pin plug, with 7 pins populated. One is ground, one is 6v for the shifter lock, one is a low voltage (like 40 mV) signal return line to the PCM, one is variable voltage for dimmable lighting, and the other 3 are 14v, one is for the ignition key cylinder lock, and the other two are for up and down shift.
Because it's a manual, will the automatic shifter plug still communicate with the PCM, and if so, does the signal return line need to be connected for it to do that, or is the PCM just looking for the voltage on a given line to be pulled down to activate its respective control?
I ask because I was wanting to tap 14 volts from one of the available lines, but I'm not sure if using the up/down shift controls will mess with the PCM, and because the ignition key lock will already be active I dont want to overload that circuit.
Now the Bluetooth board is incredibly low power, it runs at 5v and about 0.5 amps, and I plan to use a buck converter to bring down the voltage so it shouldn't add much, but regardless, I don't want to fry my PCM or brick it with other stuff and so I'm asking questions and proceeding with significant caution.
Thanks in advance for any info.
I'm trying to build a plug and play Bluetooth mod that taps into the aux audio input, and I need power for the Bluetooth board. Because I want it to be plug and play, reversible, and hidden, that precludes just plugging something into the 12v power point and aux plug in the center console, and also precludes cutting into the 12v power lines. I'd also like it to be switched power so it's not constantly draining the power, and the 12v power points stay on when the vehicle is off, so again that precludes the 12v power point.
Hopefully that context helps explain the question(s) I'm about to ask.
On the 2013 the automatic shifter, the plug (see diagram) has a 12 pin plug, with 7 pins populated. One is ground, one is 6v for the shifter lock, one is a low voltage (like 40 mV) signal return line to the PCM, one is variable voltage for dimmable lighting, and the other 3 are 14v, one is for the ignition key cylinder lock, and the other two are for up and down shift.
Because it's a manual, will the automatic shifter plug still communicate with the PCM, and if so, does the signal return line need to be connected for it to do that, or is the PCM just looking for the voltage on a given line to be pulled down to activate its respective control?
I ask because I was wanting to tap 14 volts from one of the available lines, but I'm not sure if using the up/down shift controls will mess with the PCM, and because the ignition key lock will already be active I dont want to overload that circuit.
Now the Bluetooth board is incredibly low power, it runs at 5v and about 0.5 amps, and I plan to use a buck converter to bring down the voltage so it shouldn't add much, but regardless, I don't want to fry my PCM or brick it with other stuff and so I'm asking questions and proceeding with significant caution.
Thanks in advance for any info.
