Driver Side Door Entry Lock and Unlock Functions Do Not Operate

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

DESCRIPTION

If the entry lock and unlock functions do not operate for the driver side door only, the request code may not be being transmitted from the driver side door or the front door outside handle assembly LH (touch sensor) may be malfunctioning. If the entry functions for other doors operate properly, communication between the electrical key transmitter and door control receiver is normal. In this case, there may be a problem with request code transmission [communication between the certification ECU (smart key ECU assembly) and front door outside handle assembly LH (driver side electrical key antenna)], or there may be wave interference.

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 entry and start 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. CHECK ELECTRICAL KEY ANTENNAS IN KEY DIAGNOSTIC MODE

(a) Check the following antennas in the key diagnostic mode Operation Check.





(1) Check the electrical key antenna (for driver side):

Text in Illustration





When the electrical key transmitter is brought within 0.7 to 1 m (2.30 to 3.28 ft.) of the front door outside handle assembly LH, check that the wireless door lock buzzer sounds.

OK:

Entry function operates normally.

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 CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO DRIVER SIDE ELECTRICAL KEY ANTENNA)

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





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

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

Standard Voltage:





(d) Using an oscilloscope, check the waveform.

OK:








Text in Illustration





NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal
OK -- Continue to next step.

6. REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH

(a) Temporarily replace the front door outside handle assembly LH with a new or normally functioning one Disassembly.

NEXT -- Continue to next step.

7. CHECK FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH (OPERATION)

(a) Check that the entry functions operate normally Operation Check.

OK:

Entry functions operate normally.

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

OK -- END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH IS DEFECTIVE)