Schematic for the wiring harness which is relatively simple.
I have the ACC override switch so that when the car is sent for wash/service the computer wont turn on or off repeatedly. The monitor is permanently powered but will go into standby when there is no signal from VGA. The amplifier is just like other aftermarket amplifier, permanently powered but brought up or down through remote terminal provided by M3-ATX. Ibus interpreter is always ON.
17 pin radio connector pinout
captioned
OBD work
ELM 327 (version 1.3a) interface built and tested
ELM 327 Schematic – should apply to most BMWs
OBD interfaces pictured together, on the left is the EDIABAS-INPA interface and ELM 327 on the right. Offset is USB to RS232 interface which is used with the laptop, the carputer has two native serial ports (one for obd, another for ibus).
Some screenshot of the ELM 327 in centrafuse – taken with cameraphone
Carputer
Page 1, vehicle speed, engine rpm, intake air temperature, coolant temperature, engine load,air flow rate (maf)
Page 2, timing advance, throttle position, others doesn’t seem to work
Error codes
Cleared
