If the wire harness is ground shorted as in Fig. 5, locate the section by conducting a ”continuity check with ground”.
Continuity Check with Ground
Disconnect connectors (A) and (C) and measure the resistance between terminals 1 and 2 of connector (A) and body ground. In the case of Fig. 6, Between terminal 1 of connector (A) and body ground → Continuity Between terminal 2 of connector (A) and body ground → No continuity (open) Therefore, it is found out that there is a short circuit between terminal 1 of connector (A) and terminal 1 of connector (C).
Disconnect connector ”B” and measure the resistance between terminal 1 of connector ”A” and body ground, and terminal 1 of connector ”B2” and body ground. Between terminal 1 of connector ”A” and body ground → No continuity Between terminal 1 of connector ”B2” and body ground → Continuity (short) Therefore, it is found out that there is a short circuit between terminal 1 of connector ”B2” and terminal 1 of connector ”C”.
This guide is based on the book edition Toyota (RM502U, 1997)