Pinouts >  Cars, Bikes and Trucks Diagnostic Link Connectors (DLC)
16 pin J1962 OBD-2 car diagnostic connector layout
16 pin J1962 OBD-2 car diagnostic connector
ISO 15765-4 CAN, SAE J1850 PWM, SAE J1850 VPW, ISO 9141-2, ISO 14230-4 and SAE J1939 are supported

This device is a microcontroller which is designed to interface a personal computer or laptop with a vehicle's On Board Diagnostic (OBD II) interface. It is intended to function with all protocols used by vehicle manufacturers to implement the OBD II system as defined by SAE and ISO specifications. The OBD II system became mandatory for 1996 and up vehicles, but some vehicles were already fully or partially compatible with OBD II requirements prior to 1996. The chip is not suitable for the earlier vehicles such as OBD I. The device is intended to function as a simple scan tool and is capable of sending and receiving any OBD II message defined in SAE J1979 for any of the three types of OBDII bus implementations (PWM, VPW, ISO 9141-2). It can also be used as an inexpensive interface for custom instrumentation monitoring various vehicle parameters such as speed, RPM, coolant or intake air temperature, engine load, intake air flow rate, etc.


L1,L2,L3,L4=Yellow LED
L5=Green LED
U3=78L05(5V, 100mA regulator)
U4=317L (adj. 100 mA regulator)

C1,C2,C5,C6,C7=0.1uF 16V

R32,R33=100 Ohm
R5=240 Ohm
R1,R2,R3,R4,R27,R28,R29,R30=470 Ohm
R17,R19=510 Ohm 1/2W
R16,R18=2.2 KOhm
R6,R7,R14,R15,R23,R26,R31=4.7 KOhm
R8,R9,R11,R13,R22,R24,R25,R35=10 KOhm
R10,R21,R36=22 KOhm
R20,R34=47 KOhm
R12=100 KOhm

X1=4.000MHz crystal

RS232 conn=DB-9 female

IC Socket=28 pin 0.3 (or 2x14 pin)

9 pin D-SUB female connector layout
9 pin D-SUB female connector
According to 1 reports in our database (1 positive and 0 negative) the OBD-2 PWM, VPW, ISO 9141-2, CAN ELM327 diagnostic universal cable scheme pinout should be correct.

Is this pinout
Source(s) of this and additional information: OBD II Interface Chip Data Sheet,,
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