Engine Switch Indicator Circuit: Procedure

1. Remove the engine switch.
   Fig 1: Inspecting Engine Switch

   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 does 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 J31 switch connector.
   Fig 2: Identifying J31 Engine Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the J55 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE POWER SOURCE CONTROL ECU