Engine Switch Indicator Circuit: Wiring Diagram

1. Remove the engine switch.
   Fig 2: Identifying Indicator Light Connector

   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 CHART
   
   

   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 of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

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

   Fig 3: Identifying J31 Engine Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : REPLACE POWER SOURCE CONTROL ECU