Engine Switch Indicator Circuit: Procedure

1. Remove the engine switch.
   Fig 1: Identifying Engine Switch Connector Terminals

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

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

   OK

   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 E68 switch connector.
   Fig 2: Identifying Main Body ECU And Engine Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E61 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   E68-11 (SWIL) - E61-25 (SWIL)	Always	Below 1 Ω
   E68-12 (INDS) - E61-15 (INDS)	Always	Below 1 Ω
   E68-13 (INDW) - E61-14 (INDW)	Always	Below 1 Ω
   E68-5 (GND) - Body ground	Always	Below 1 Ω
   E68-4 (COM) - Body ground	Always	Below 1 Ω
   E68-11 (SWIL) or E61-25 (SWIL) - Body ground	Always	10 kΩ or higher
   E68-12 (INDS) or E61-15 (INDS) - Body ground	Always	10 kΩ or higher
   E68-13 (INDW) or E61-14 (INDW) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU