1. The communication line of the steering wheel buttons is on the connector behind the original car screen. There are two types of connector : low configuration and high configuration. It is necessary to distinguish which type of the connector behind the original car screen is.

Type 1: The connector is a 12PIN connector

Type 2: The connector is a 54PIN connector

2. Check whether the SWC line is connected to the 9th pin SWC of the 20P connector of the CAN box. Because there are two types of original connectors, many cables are equipped with low-end 12PIN connectors, which cannot be plugged into high-end 54PIN connectors. You can use a low-to-high-end plug conversion line, or manually change the line connection to solve this problem.

(Connect the SWC-GND line to the GND line of the CAN box)