BMW 5251 Service Manual page 412

/Fuel injection
Table b. Siemens MS 41.1 ECM pin assignments (continued)
85
86
87
88
CAN-Bus low
CAN-Bus high
Power supply
Diagnostic connector (TxD)
inputloutput
inpuWoutput
input
input output
Automatic transmission control module (AGS)
Automatic transmission control module (AGS)
Battery voltage from main relay terminal 87
Diagnostic TxD signal to pin 17 in data link connector