Driver Side Door Entry Unlock Function Does Not Operate

THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function): Driver Side Door Entry Unlock Function does not Operate
- Driver Side Door Entry Unlock Function does not Operate

DESCRIPTION

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

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.
* Before performing the inspection, check that DTC B1242 (wireless door lock control) is not output Smart Key System (for Entry Function).
* 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 (DOOR LOCK POSITION SWITCH)

(a) When the door control switch on the power window regulator master switch assembly on the driver side door is operated, check the Data List using the Techstream Smart Key System (for Entry Function).

Main Body





OK:

The Techstream display changes correctly in response to the operation of the front door lock assembly LH.

NG -- Go to LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit) Door Unlock Detection Switch Circuit
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (UNLOCK SENSOR)

(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 front door outside handle assembly LH.

NG -- CHECK HARNESS AND CONNECTOR (FRONT DOOR OUTSIDE HANDLE LH - CERTIFICATION ECU AND BODY GROUND)

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

4. CHECK HARNESS AND CONNECTOR (FRONT DOOR OUTSIDE HANDLE LH - CERTIFICATION ECU AND BODY GROUND)

(a) Disconnect the G1 front door outside handle assembly LH 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.

5. CHECK FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH (DRIVER SIDE DOOR UNLOCK SENSOR SIGNAL INPUT)

(a) Connect the G1 front door outside handle assembly LH connector.





Text in Illustration





(b) Connect the C35 certification ECU (smart key ECU assembly) connector.

(c) Using an oscilloscope, check the waveform.

OK:








NG -- REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH Disassembly

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