Precautions for CAN System

WARNING: This page is about a different car, the 2006 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

Do not apply voltage of 7.0 V or higher to terminal to be measured.
Maximum open terminal voltage of tester in use must be less than 7.0 V.
Before checking harnesses, turn ignition switch OFF and disconnect the battery cable from the negative terminal.
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: Illustration Of Properly Repaired Wire Connection
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: Illustration Of Bypass Wire Connection
Courtesy of NISSAN MOTOR CO., U.S.A.