Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Wireless Door Lock Tuner Circuit Malfunction (B1242)

DESCRIPTION

The electrical key and tire pressure monitoring system receiver assembly is used to receive radio waves related to the entry functions of the electrical key transmitter sub-assembly. The certification ECU (smart key ECU assembly) decodes the requested electrical key transmitter sub-assembly operation by identifying a key code based on the radio waves received via the electrical key and tire pressure monitoring system receiver assembly. The electrical key and tire pressure monitoring system receiver assembly receives a signal from the electrical key transmitter sub-assembly and sends signals to the main body ECU (multiplex network body ECU) through the certification ECU (smart key ECU assembly). (ex. If a door lock operation is requested, the certification ECU (smart key ECU assembly) sends a door lock command to the main body ECU (multiplex network body ECU)).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• 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 Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key(CAN). 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.
• Before replacing the certification ECU (smart key ECU assembly), refer to Registration.

  Click here

• When replacing or inspecting the electrical key and tire pressure monitoring system receiver assembly and wire harness, do not change the position or length of the wire harness. If the wire harness is too close to the electrical key and tire pressure monitoring system receiver assembly, the performance of the entry function and wireless function may be affected.
• This DTC is not stored within 10 seconds of the engine switch being turned from on (IG) to off.
• Make sure that there are no electrical key transmitter sub-assemblies in the vehicle.
• When replacing the electrical key and tire pressure monitoring system receiver assembly, read the transmitter IDs (tire pressure warning system) stored in the old ECU using the Techstream and write them down before removal.

  Click here

• If the electrical key and tire pressure monitoring system receiver assembly has been replaced, it is necessary to perform initialization (Click here ) after registration (Click here ) of the transmitter IDs to the electrical key and tire pressure monitoring system receiver assembly.

PROCEDURE

(a) Disconnect the K11 electrical key and tire pressure monitoring system receiver assembly connector.

(b) Measure the voltage and resistance and check for pulses according to the value(s) in the table below.

Standard Voltage:

Standard Resistance:

OK

REPLACE ELECTRICAL KEY AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY

NG

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

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

Standard Resistance:

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR