Inspection Procedure

1. Remove the engine switch.
   Fig 1: Identifying Indicator Light Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage between the terminals of the witch, and check the illumination condition of the switch.
   NOTE:

   • If the positive (+) lead and the negative (-) lead are incorrectly connected, the engine switch indicator does not illuminate.
   • If the voltage is too low, the indicator will not illuminate.

   OK 

   BATTERY VOLTAGE SPECIFICATION
   
   

   Measurement Condition	Specified Condition
   Battery positive (+) → Terminal 11 (SWIL) Battery negative (-) → Terminal 4 (COM) or 5 (GND)	Illuminates
   Battery positive {+) → Terminal 12 (INDS) Battery negative (-) → Terminal 4 (COM) or 5 (GND)	Illuminates
   Battery positive (+) -* Terminal 13 (INDW) Battery negative (-) → Terminal 4 (COM) or 5 (GND)	Illuminates

NG: REPLACE ENGINE SWITCH 

OK: Go to next step. 

1. Disconnect the J31 switch connector.
2. Disconnect the J55 ECU connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   J31-11 (SWIL) - J55-36 (SWIL)	Always	Below 1 Ω
   J31-12 (INDS) - J55-4 (INDS)	Always	Below 1 Ω
   J31-13 (INDW) - J55-13 (INDW)	Always	Below 1 Ω
   J31-5 (GND) - Body ground	Always	Below 1 Ω
   J31-4 (COM) - Body ground	Always	Below 1 Ω
   J31-11 (SWIL) or J55-36 (SWIL) - Body ground	Always	10 kΩ or higher
   J31-12 (INDS) or J55-4 (INDS) - Body ground	Always	10 kΩ or higher
   J31-13 (INDW) or J55-13 (INDW) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying J31 Engine Switch And J55 Power Source Control ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE POWER SOURCE CONTROL ECU