Back Door Entry Lock Function Does Not Operate

THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function): Back Door Entry Lock Function does not Operate
- Back Door Entry Lock Function does not Operate

DESCRIPTION

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

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* The smart key system (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 key system (for Entry Function) after confirming that the communication systems are functioning properly.
* When using the Techstream with the engine switch off to troubleshoot:
Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds until communication between the Techstream and vehicle begins.
* Check that there are no electrical key transmitters in the vehicle.
* When checking the entry lock operation multiple times, the lock operation may be limited to 2 consecutive operations depending on the settings. In order to perform the entry lock operation 3 or more times, an unlock operation must be performed once (any type of unlock operation is sufficient). However, only consecutive entry lock operations are limited. Using the wireless lock or other types of lock operations, it is possible to perform consecutive lock operations without this limitation.
* Before replacing the certification ECU (smart key ECU assembly), refer to the smart key system (for Entry Function) Smart Key System (for Entry Function).

PROCEDURE

1. CHECK POWER DOOR LOCK OPERATION

(a) When the door control switch on the power window regulator master switch assembly on the driver side door 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 Problem Symptoms Table
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (LOCK SWITCH)

(a) Using the Techstream, read the Data List Smart Key System (for Entry Function).

Smart Key





OK:

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

NG -- CHECK HARNESS AND CONNECTOR (BACK OPENER SWITCH - CERTIFICATION ECU AND BODY GROUND)

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

3. CHECK HARNESS AND CONNECTOR (BACK OPENER SWITCH - CERTIFICATION ECU AND BODY GROUND)

(a) Disconnect the L1 back door electrical key switch connector.

(b) Disconnect the C35 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.

4. INSPECT BACK DOOR OPENER SWITCH ASSEMBLY (LOCK 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