Precaution for CAN System

WARNING: This page is about a different car, the 2008 Nissan Titan. 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: Identifying Soldered And Wound With Tape Harness Area
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 - Do Not Make Bypass Wire Connection To Repaired Area

Courtesy of NISSAN MOTOR CO., U.S.A.