Check Short Circuit

WARNING: This page is about a different car, the 2003 Lexus GS 430 and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

If the wire harness is ground shorted as in Fig 1, locate the section by conducting a "continuity check with ground".

Fig 1: Checking Continuity With Ground

Check the continuity with ground.

Disconnect connectors "A" and "C" and measure the resistance between terminal 1 and 2 of connector "A" and body ground.
In the case of Fig 2:

Between terminal 1 of connector "A" and body ground --> Continuity (short)

Between terminal 2 of connector "A" and body ground --> No continuity

Therefore, it is found out that there is a short circuit between terminal 1 of connector "A" and terminal 1 of connector "C".

Fig 2: Measuring Resistance Between Terminal 1 And 2 Of Connector "A" And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
In the case of Fig 3:

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".

Fig 3: Measuring Resistance Between Terminal 1 Of Connector "A" And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002