This instruction show you guide on how to solve BMW F18 N52T engine car 2E7C BSD CAN BUS communication fault.
BMW error code 2E7C indicates a communication fault in the Bit-Serial Data Interface (BSD)12, which is a data bus that connects various components such as the alternator, the battery sensor, the oil condition sensor, and the engine control unit.
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Reason:
DME internal fault, LIN bus transceiver is damaged.
Replace No. 1 on the right side of the picture below. TJA1020 chip, if there is a fault code DME internal fault SPI communication protocol fault, Replace the TJA1020 chip No. 2 on the left together.
PINNING:
RXD PIN 1
Receive data output (open-drain);active LOW after a wake-up event
NSLP PIN 2:
Sleep control input (active LOw);controls inhibit output; resets wake-up source flag on TXD and wake-up request on RXD
NWAKE PIN 3:
Local wake-up input (active LOW);negative edge triggered
TXD PIN4:
Transmit data input; active LOW output after a local wake-up event
GND PIN 5:
Ground
LIN PIN 6:
LIN bus line input/output
BAT PIN 7:
Battery supply
INH PIN 8
Battery related inhibit output for controlling an extemal voltage regulator;active HIGH after a wake-up event
PIN 6 is the LIN signal input and output terminal. The normal output voltage is close to the power storage Cell voltage, the picture above is the standard waveform