Power Switch Illumination Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Check the operation.
   MAIN BODY:
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Indicator for Lighting	Power switch illumination	ON / OFF	All doors closed

   OK

   Power switch illumination comes on.

NG → See step   2 

OK → See step   5 

1. Remove the power switch.
   Fig 1: Checking Power Switch For Illumination

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage to the power switch.
3. Check that the illumination comes on.

   OK

   Measurement Condition	Specified Condition
   Battery positive (+) → Terminal 11 (SWIL) Battery negative (-) → Terminal 5 (GND) or 4 (COM)	Power switch illumination comes on

NG → See step   4 

OK: Go to next step 

1. Disconnect the D8 main body ECU connector.
   Fig 2: Checking Harness And Connector (Power Switch - Main Body ECU And Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D25 power switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   D25-11 (SWIL) - D8-25 (SWIL)	Always	Below 1 Ω
   D25-4 (COM) or D25-5 (GND) - Body ground	Always	Below 1 Ω
   D25-11 (SWIL) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)