Inspection Procedure

1. Check the Data List to determine if the back door courtesy light switch function properly.

   Back door (Power back door ECU) 

   DIAGNOSTIC NOTE TABLE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Courtesy SW	Back door courtesy light switch signal / ON or OFF	ON Back door is open OFF Back door is closed	-

   OK: The display is as specified in the normal condition. 

NG: Go to step   2 

OK: REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU)  (See REMOVAL  )

1. Remove the back door lock. (See REMOVAL )
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance: Back door courtesy light switch 

   TESTER CONNECTION SPECIFIED CONDITION TABLE
   
   

   Tester Connection	Door lock latch Position	Specified Condition
   3 (BDCY) - 4 (GND)	Open-latch	Below 1 Ω
   3 (BDCY) - 4 (GND)	Half-latch	Below 1 Ω
   3 (BDCY) - 4 (GND)	Full-latch	10 kΩ or higher
   3 (BDCY) - 4 (GND)	Over-latch	10 kΩ or higher

   Fig 1: Identifying Back Door Lock (Back Door Courtesy Light Switch)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE BACK DOOR LOCK  (See REMOVAL )

OK: Go to next step 

1. Disconnect the T4 door lock connector.
2. Disconnect the O15 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION TABLE
   
   

   Tester Connection	Condition	Specified Condition
   T4-3 (BDCY) - O15-20 (FUL)	Always	Below 1 Ω
   T4-4 (GND) - Body ground	Always	Below 1 Ω
   T4-3 (BDCY) - Body ground	Always	10 kΩ or higher

   Fig 2: Identifying Harness & Connector (Back Door Lock - Power Back Door ECU & Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU)  (See REMOVAL  )