[bidari]

The diagnostic port, often referred to as the OBD-II (On-Board Diagnostics II) port, is a standardized 16-pin connector used in most vehicles, including Toyota models, for diagnostics and troubleshooting. Below is the pinout for the OBD-II port:

OBD-II Port Pinout
Pin Signal Name Description
1 Manufacturer Discretionary Optional use by manufacturer
2 J1850 Bus+ SAE J1850 communication line (bus positive)
3 Manufacturer Discretionary Optional use by manufacturer
4 Chassis Ground Connected to vehicle chassis ground
5 Signal Ground Signal ground
6 CAN High (J-2284) CAN Bus High signal
7 ISO 9141-2 K-Line K-Line for ISO 9141-2 and ISO/DIS 14230-4
8 Manufacturer Discretionary Optional use by manufacturer
9 Manufacturer Discretionary Optional use by manufacturer
10 J1850 Bus- SAE J1850 communication line (bus negative)
11 Manufacturer Discretionary Optional use by manufacturer
12 Manufacturer Discretionary Optional use by manufacturer
13 Manufacturer Discretionary Optional use by manufacturer
14 CAN Low (J-2284) CAN Bus Low signal
15 ISO 9141-2 L-Line L-Line for ISO 9141-2 and ISO/DIS 14230-4
16 Battery Power Direct battery power (+12V)

Detailed Pin Functions:
Pin 1, 3, 8, 9, 11, 12, 13: Manufacturer Discretionary

These pins can be used by the vehicle manufacturer for proprietary purposes and may not always be present or used in all vehicles.
Pin 2: J1850 Bus+

Used for SAE J1850 PWM (Pulse Width Modulation) communication protocol.
Pin 4: Chassis Ground

Connects to the vehicle’s chassis ground, providing a ground reference for the diagnostic tool.
Pin 5: Signal Ground

Provides a signal ground reference for the diagnostic tool.
Pin 6: CAN High (J-2284)

CAN (Controller Area Network) High line used for CAN bus communication.
Pin 7: ISO 9141-2 K-Line

Used for K-Line communication for ISO 9141-2 and ISO/DIS 14230-4 (KWP2000) protocols.
Pin 10: J1850 Bus-

Used for SAE J1850 PWM communication protocol.
Pin 14: CAN Low (J-2284)

CAN (Controller Area Network) Low line used for CAN bus communication.
Pin 15: ISO 9141-2 L-Line

Used for L-Line communication for ISO 9141-2 and ISO/DIS 14230-4 (KWP2000) protocols. This is less commonly used in modern vehicles.
Pin 16: Battery Power

Provides direct battery power to the diagnostic tool, typically +12V.

[Anatomist NoElectrons]

My 2005 Prius OBD-II pin 16 is not receiving 12V voltage. I checked the fuse box near the foot brake which has a fuse labeled OBD. Fuse is good, but neither leads there have 12V voltage. Assumed it must be a problem with the main fuse box and checked all the fuses and relays. All checked out OK. Where could the problem be? Could it be wiring harness? How do I diagnose this problem?

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