Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Lock Function (Entry Lock Function does not Operate Using Close &)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Entry Function) / Lock Function (Entry Lock Function does not Operate Using Close &)

DESCRIPTION

If the back door does not lock when using the power back door close and lock function, there may be communication problem between the certification ECU (smart key ECU assembly) and main body ECU (multiplex network body ECU).

CAUTION / NOTICE / HINT

NOTICE:

  • The smart access system with push-button start (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following 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.

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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 Access. 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.
  • After repair, confirm that no DTCs are output.
  • Check that there are no electrical key transmitter sub-assemblies in the vehicle.
  • Make sure that the electrical key transmitter sub-assembly is within the power back door close and lock function operating range when performing a back door close and lock operation.

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PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Access > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B
B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Back Door > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B
B

GO TO POWER BACK DOOR SYSTEM

A

3.

CHECK POWER BACK DOOR CLOSE AND LOCK OPERATION

(a) Open the back door with the electrical key transmitter sub-assembly outside of the vehicle.

(b) While carrying the electrical key transmitter sub-assembly, press the door control switch and check that the back door closes automatically and then locks.

HINT:

If the door control switch is pressed by a hand which is also holding the electrical key transmitter sub-assembly, the electrical key transmitter sub-assembly may not be detected as in the exterior detection area and the power back door close and lock function may not operate.

*1

Door Control Switch

Result

Proceed to

Power back door close and lock function operates normally

A

Power back door close and lock function does not operate normally

B
A

USE SIMULATION METHOD TO CHECK

B

GO TO OTHER PROBLEM

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