Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Front Passenger Side Door Entry Unlock Function does not Operate

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• The smart key system (for Entry Function, Gasoline Model) uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Entry Function, Gasoline Model) after confirming that the communication systems are functioning properly.

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• When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
• Check that there are no electrical key transmitter sub-assemblies in the vehicle.
• Before replacing the certification ECU (smart key ECU assembly), refer to Precaution.

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• After repair, confirm that no DTCs are output.

PROCEDURE

(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.

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OK:

Door locks operate normally.

NG

GO TO POWER DOOR LOCK CONTROL SYSTEM

OK

(a) Connect the Techstream to the DLC3.

(b) Turn the engine 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.

OK:

The Techstream display changes correctly in response to the lock/unlock operation of the front passenger door.

NG

GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit)

OK

(a) Turn the engine switch off.

(b) Open and close the front passenger door.

(c) With the electrical key transmitter sub-assembly outside of the vehicle, press the lock switch of the electrical key transmitter sub-assembly to lock all of the doors.

(d) Hold the electrical key transmitter sub-assembly at the same height as the door outside handle assembly and approximately 0.3 m (0.984 ft.) from the front passenger door.

(e) Check that the LED of the electrical key transmitter sub-assembly blinks.

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

(g) Touch the unlock sensor on the backside of the front door outside handle assembly (for front passenger door). HINT: When checking the operation of the unlock sensor again, make sure to perform the procedure from step (a). Body Electrical > Smart Key > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note P-Door Touch Sensor Front passenger door touch sensor (unlock sensor) OFF or ON OFF: Front passenger door touch sensor (unlock sensor) not touched ON: Front passenger door touch sensor (unlock sensor) touched Displays whether the unlock sensor is on or off (even if the sensor is touched and contact is maintained, "ON" is displayed only momentarily). Use this Data List item to help determine if there is an unlock sensor malfunction when the entry unlock function does not operate. Body Electrical > Smart Key > Data List Tester Display P-Door Touch Sensor OK: The Techstream display changes correctly in response to the operation of the front door outside handle assembly (for front passenger door).

*a Unlock Sensor (Backside)

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

(a) Disconnect the K10 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the I7 front door outside handle assembly (for front passenger door) connector.

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

Standard Resistance:

(d) Reconnect the I7 front door outside handle assembly (for front passenger door) connector.

(e) Reconnect the K10 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Using an oscilloscope, check the waveform.

OK:

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR FRONT PASSENGER DOOR)