Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

Check for open and short in wire harness between park/neutral position switch and HV ECU . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION .
Terminals for checking open and short:

Fig 1: Testing Between Park/Neutral Position Switch & HV ECU Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Repair or replace wire harness.
2. OK: Check and repair park/neutral position switch. See PARK/NEUTRAL POSITION SWITCH .