Engine Hood Courtesy Switch Circuit: Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch to the ON position.
3. Turn the Techstream main switch on.
4. Select the item below in the Data List and read the display on the tester.
   MAIN BODY:
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Hood Courtesy Switch	Engine hood courtesy switch signal ON / OFF	ON: Engine hood is OPEN OFF: Engine hood is CLOSED	-

   OK

   The indicator on Techstream switches between ON and OFF in accordance with the engine hood courtesy switch status.

NG → See step   2 

OK → See step   5 

1. Disconnect the A8 courtesy switch connector.
   Fig 1: Identifying Engine Hood Courtesy Switch Connector & Engine Hood Lock Assembly

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

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   1 - 2	LOCK position	10 kΩ or higher
   	UNLOCK position	Below 1 Ω

NG → See step   6 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying A8 Engine Hood Courtesy Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   A8-2 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the D8 ECU connector.
   Fig 3: Identifying D8 ECU Connector & Engine Hood Courtesy Switch

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   D8-16 (HCTY) - A8-1	Always	Below 1 Ω
   D8-16 (HCTY) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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