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English: OBD-II type B female connector shape and pinout (The pins inside the connector are female, while the connector itself —the plastic body— is male). Español: Aspecto y posición de los contactos en un conector OBD-II hembra (los contactos son hembra, pero el cuerpo del conector es macho).
The data link connector (DLC) is the multi-pin diagnostic connection port for automobiles, trucks, and motorcycles used to interface a scan tool with the control modules of a given vehicle and access on-board diagnostics and live data streams. [1] Prior to 1996, many OBD-I data link connector's were in the engine compartment, usually near the ...
For ALDL connections, pin 9 is the data stream, pins 4 and 5 are ground, and pin 16 is the battery voltage. An OBD 1.5 compatible scan tool is required to read codes generated by OBD 1.5. Additional vehicle-specific diagnostic and control circuits are also available on this connector.
From 1996 to 2001, the 6-pin Deutsch-connector was standard. Beginning in 2001, most OEMs converted to the 9-pin Deutsch. Some OEMs still use the 6-pin Deutsch. It has mostly been used for US made vehicles, and also by Volvo. Other European brands have usually used KWP. The pinout for the 9-pin connector is:
Unfortunately, the definition of which signals were present on each pin varied between vehicle models. There were generally only three pins used for basic ALDL —ground, battery voltage, and a single line for data—, although other pins were often used for additional vehicle-specific diagnostic information and control interfaces.
Pin A is for activation of so-called Blackout Mode. It turns off all the lights except convoy lighting if it is active. The lighting inside the vehicle shall also be extinguished if it is not specifically shaded. Pin C is for Convoy Lamps, which is the special convoy lighting, corresponding to the tail lights, to be used while driving in the dark.
Ground pins are all shown in the up direction. Reorienting 14-30 and 14-50 this way makes the diagram match most commercially available cables. Reorienting 5-15 is controversial because most residential installations use ground down, but many commercial or healthcare installations use ground up, and I'd like the diagram to be consistent.
To the ignition cassette there are four triggering lines connected from the Trionic ECU, pin 9 (cyl. 1), pin 10 (cyl. 2), pin 11 (cyl. 3) and pin 12 (cyl. 4). When the ECU is grounding pin 9, the primary coil for the first cylinder is grounded (via the ignition cassettes B+ intake) and 400 V is transformed up to a maximum of 40 kV in the ...