After connecting the G82 M4, the LCD screen does not light up and there is no response in CAN communication.

[majiaquan]

I wrote the file correctly, but now the computer isn't outputting a signal, the LCD screen isn't lit, and it's not sending a CAN signal to the car. It keeps showing a transmission damage warning. I don't know if it's a software setting issue or a wiring problem. I'm using the manufacturer-supplied dedicated kit harness; I only need to connect the power and ground wires. Requesting assistance.

[M4comp]

Just so I'm sure, are you saying the TCU does connect to the laptop but no LCD display?

The LCD display is typically powered by the TCU so either the TCU is not on or the LCD has issues.
Do you have 5 volts at pin 62 of the TCU? Do you have 12volts at pin 22 of the TCU?

[majiaquan]

Hello, pin 22 has a 12V output, but pin 62 does not have a 5V output. The computer can connect to the TCU, but the data stream display shows no response.

[majiaquan]

The problem was found: pin 62 wasn't properly crimped into the LCD display, causing a lack of power. After fixing it, error code 33 appeared. I checked and found that the CAN L and CAN H lines were reversed; swapping them fixed the issue. However, I can't see the computer's data stream in the software, as shown in the screenshot. I don't know where the setting is wrong.

[M4comp]

I don't see a screenshot but to connect to the TCU you need to complete the following if you haven't yet.
https://manual.turbolamik.eu/docs/pc-software/tunerpro/

In TunerPro you also need an XDF loaded and a base map to see the live data. Once you have 2 files opened in TunerPro then press the live data button. There is a possiblity of the firmware not being loaded but I would need to see the message at the bottom left corner. Make sure the correct file for the trans is uploaded to the TCU and remember there is no live tuning - meaning you make a change you have to upload it manually everytime.

.

[majiaquan]

Thank you. These issues are now resolved, but a new problem has arisen: the vehicle's four-wheel drive system is not engaging; only rear-wheel drive is working. What AWD output type should I set? I don't see any G-chassis models in the options.