BMW E36 diagnostic connector is the interface to connect to the engine control program. Through it can be considered bugs of the car or make some settings, for example to reset oilinspector service. In older cars BMW 3 series used two interfaces: 15 pin connector and 20 pin connector.
Until 1987 (15 pins)
1 (-) Ground
4 temperature Sensor
5 Oxygen sensor
6 Diagnosis SRS
7 Reset Service indicator
8 crankshaft position Sensor (+)
9 Shielding
10 the crankshaft position Sensor (-)
11 External starter
12 Signal generator operation (relay battery charging)
13 the Signal of ignition
14 (+) Battery
15 electrical system ignition
After 1987 (20 pins)
1 BK Signal ignition
6 WT/BK SRS Diagnostics
7 WT/GN Reset Service indicator
11 BK/YL External starter
12 BU Signal generator (relay battery charging)
14 RD (+) Battery
15 WT/YL Motronic RxD (L-line)
16 GN/WT Oxygen sensor
18 GN/BU Motronic Programming Voltage
19 BR (-) Earth
20 WT/VI TxD Motronic (K-line)
