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   8 

OK: Go to next step 

1. Check if the power back door is equipped on the vehicle.
   RESULT
   
   

   Result	Proceed to
   w/ Power Back Door System	A
   w/o Power Back Door System	B

B → See step   4 

A: Go to next step 

1. When the power back door switch is operated, check that the power back door opens.

   OK

   Power back door is open.

   RESULT
   
   

   Result	Proceed to
   NG	A
   OK	B

B → See step   5 

A → See step   9 

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 unlocked OFF: Back door locked	-

   OK

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

NG → See step   11 

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 Handle SW	Back door opener switch / ON or OFF	ON: Back door opener switch pushed OFF: Back door opener switch not pushed	-

   OK

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

NG → See step   6 

OK → REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

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

   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   10 

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)