Back Door Entry Unlock Function Does Not Operate

THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function): Back Door Entry Unlock Function does not Operate
- Back Door Entry Unlock Function does not Operate

DESCRIPTION

If the entry unlock function does not operate for the back door only, but the entry lock function operates, the request code is being transmitted properly from the back door. In this case, there may be a problem related to the unlock switch (connection between the back door opener switch assembly and certification ECU (smart key ECU assembly)).

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* The smart access system with push-button start (for Entry Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting How To Proceed With Troubleshooting. Troubleshoot the smart access system with push-button start (for Entry Function) after confirming that the communication systems are functioning properly.
* When using the Techstream with the power switch off to troubleshoot:
Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.
* Check that there are no electrical key transmitters in the vehicle.
* Before replacing the certification ECU (smart key ECU assembly), refer to the smart access system with push-button start (for Entry Function) Smart Access System With Push-Button Start (For Entry Function).
* After repair, confirm DTC not reoccur with performing the "DTC Output Confirmation Operation".

PROCEDURE

1. READ VALUE USING TECHSTREAM (ENTRY BACK DOOR OPEN FUNCTION)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Smart Access / Data List.

(e) Read the Data List according to the display on the Techstream.

Smart Access





Result





B -- PERFORM CUSTOMIZE SETTING (Proceed to Customize Parameters) Smart Access System With Push-Button Start (For Entry Function)
A -- Continue to next step.

2. CHECK POWER DOOR LOCK OPERATION

(a) When the door control switch on the multiplex network master switch assembly is operated, check that the doors unlock and lock according to the switch operation Operation Check.

OK:

Door locks operate normally.

NG -- GO TO POWER DOOR LOCK CONTROL SYSTEM How To Proceed With Troubleshooting
OK -- Continue to next step.

3. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Enter the following menus: Body Electrical / Main Body / Active Test.

(b) Perform the Active Test according to the display on the Techstream.

Main Body





OK:

The back door lock assembly unlatches when ON is selected.

NG -- GO TO POWER DOOR LOCK CONTROL SYSTEM Only Back Door Cannot Be Opened
OK -- Continue to next step.

4. READ VALUE USING TECHSTREAM (UNLOCK SWITCH)

(a) Using the Techstream, read the Data List Smart Access System With Push-Button Start (For Entry Function).

Smart Access





OK:

The Techstream display changes correctly in response to the operation of the back door opener switch assembly.

NG -- CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - CERTIFICATION ECU)

OK -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

5. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - CERTIFICATION ECU)

(a) Disconnect the V4 back door opener switch assembly connector.

(b) Disconnect the H1 certification ECU (smart key ECU assembly) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. INSPECT BACK DOOR OPENER SWITCH ASSEMBLY (UNLOCK SWITCH)

(a) Remove the back door opener switch assembly Removal.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPLACE BACK DOOR OPENER SWITCH ASSEMBLY Removal

OK -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal