Back Door Entry Unlock Function does not Operate: Procedure

1. When the door control switch of the master switch assembly is operated, check that the locked doors unlock.

   OK

   Door locks operate normally.

NG → See step   6 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Data List.
5. Read the Data List according to the display on the Techstream.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Back Lock Pos switch	Back door lock position switch signal / ON or OFF	ON: Back door is unlocked OFF: Back door is locked	-

   OK

   On the Techstream screen, the display changes between ON and OFF as shown in the chart above.

NG → See step   8 

OK: Go to next step 

1. Using the Techstream, read the Data List.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Back Door Open Handle SW	Back door opener switch / ON or OFF	ON: Back door opener switch is pushed OFF: Back door opener switch is not pushed	-

   OK

   "ON" (switch is pushed) or "OFF" (switch is not pushed) appears on the screen.

NG → See step   4 

OK → REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

1. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying Back Door Opener Switch Operation

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   1 (UL) - 2 (L) 3 (B) - 2 (L)	Not pushed	10 kΩ or higher
   1 (UL) - 2 (L)	Lock switch pushed	Below 1 Ω
   3 (B) - 2 (L)	Open switch pushed	Below 1 Ω

NG → See step   7 

OK: Go to next step 

Fig 2: Identifying E1 ECU Connector And S7 Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E1 ECU connector.
2. Disconnect the S7 switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E1-26 (BDSU) - S7-3 (B)	Always	Below 1 Ω
   E1-26 (BDSU) or S7-3 (B) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)