Driver Side Door Entry Unlock Function Does Not Operate

THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (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 door only, but the entry lock function operates, the request code is being transmitted properly from the driver 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 (for driver door) [unlock sensor]).

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 performing the inspection, check that DTC B1242 (wireless door lock control) is not output Reading and Clearing Diagnostic Trouble Codes.
* 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. 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.

2. READ VALUE USING TECHSTREAM (DOOR LOCK POSITION SWITCH)

(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 / Main Body / Data List.

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

Main Body





OK:

On the Techstream screen, the display changes between LOCK and UNLOCK as shown in the chart above.

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 Access System With Push-Button Start (For Entry Function).

Smart Access





OK:

The Techstream display changes correctly in response to the operation of the front door outside handle assembly (for driver door).

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

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

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

(a) Disconnect the O1 front door outside handle assembly (for driver door) 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.

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

(a) Connect the O1 front door outside handle assembly (for driver door) connector.





Text in Illustration





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

(c) Using an oscilloscope, check the waveform.

OK:





NG -- REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FRONT DRIVER DOOR) Disassembly

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