Precaution for CAN System

WARNING: This page is about a different car, the 2010 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

Do not apply voltage of 7.0V or higher to terminal to be measured.
Maximum open terminal voltage of tester in use must be less than 7.0V.
Before checking harnesses, turn ignition switch OFF and disconnect battery negative cable.
Area to be repaired must be soldered and wrapped with tape. Make sure that fraying of twisted wire is within 110 mm (4.33 in).

Fig 1: Precaution For Soldered And Wound With Tape
Courtesy of NISSAN MOTOR CO., U.S.A.
Do not make a bypass connection to repaired area. (If the circuit is bypassed, characteristics of twisted wire will be lost.)

Fig 2: Precaution For Bypass Wire Connection
Courtesy of NISSAN MOTOR CO., U.S.A.