Wiring problems of the 2007 Nissan Titan

Column shifter causes damage to wiring harness of the manual mode transmission button. When shifting vehicle into drive, column hits wiring harness, and over time causes wiring to the transmission manual mode button to break. Once this breaks, there is no means to down shift vehicle, causing a hazard especially when traveling roads where there are elevation changes. Was able to determine the cause of the manual mode button failure by researching Nissan Titan forums (club Titan and Titan talk). Upon removing steering column shroud immediately noticed chaffing of the wiring harness, and the broken wire. Contacted Nissan, Nissan was not concerned with this issue due to the age (currently 3 years) of the vehicle.

A 7 way trailer plug adapter was plugged upside down into a 2007 Nissan Titans receptacle socket and it caused the chassis wiring harness, the engine wiring harness and the main wiring harness to all melt down. Other electrical components are also probably damaged. It would appear that there was not a properly designed circuit to limit the damage to the electrical system or it malfunctioned. Although the vehicle did not catch fire, the plastic coating on the wiring was melted down, the plug adapter was very hot and it potentially could have resulted in a fire if the plug would have been left in long enough. It is suggested that this defect be investigated by Nissan.