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A Nissan Maximas second-generation On-Board Diagnostic Connector can be found under the dashboard and to the left of the steering column. It will be uncovered, with no access panels blocking it from view.
OBD-II
For all Nissans manufactured after 1996, the OBD-II access port is called a Data Link Connector. It may not be in the exact same location in all Nissan models. The DLC outlet provides access to the Maximas diagnostic computer, but accessing the system requires an OBD-II compliant handheld scanner.
How to Access
Connect a diagnostic cable to an OBD-II compliant device. Insert the cables 16-pin plug into the Maximas DLC outlet and switch the device on. Turn the Maximas electrical system on. Some types of OBD-II devices may also need the engine running. Consult the devices manual on how to either pull code or interact with the Maximas internal sensor array.
OBD-I
Nissans unique OBD-I system does not use a data connector. Nissan vehicles predating 1996 use a special computer system. The Maximas central computer module is located inside the vehicle, on the passengers side. The diagnostic system relays fault codes through a special box outfitted with an LED light. Codes come in two-digit numbers, and the codes are conveyed with long and short LED flashes. For example, code 12 is represented by a long flash followed by two briefer ones.
