Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001GU3K
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): Entry Exterior Alarm and Answer-back Buzzer do not Sound; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

Entry Exterior Alarm and Answer-back Buzzer do not Sound

DESCRIPTION

The smart key system (for Entry Function) uses the wireless door lock buzzer to perform various vehicle exterior warnings. When the conditions of each warning are met, the certification ECU (smart key ECU assembly) sends a buzzer activation request signal to the main body ECU (multiplex network body ECU) via CAN communication and the buzzer sounds.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • Before replacing the certification ECU (smart key ECU assembly) or main body ECU (multiplex network body ECU), refer to Precaution.

    Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): PRECAUTION 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): PRECAUTION

  • After repair, confirm that no DTCs are output.

PROCEDURE

1.

CHECK CUSTOMIZE SETTING (WIRELESS BUZZER RESP)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Customize Setting / Wireless Door Lock.

Wireless Door Lock

Tester Display

Description

Default

Setting

ECU

Wireless Buzzer Resp

Wireless buzzer response

ON

0:OFF,1:ON

Main body ECU (multiplex network body ECU)

Result

Proceed to

"ON" is displayed

A

"OFF" is displayed

B
B

PERFORM CUSTOMIZE SETTING

A

2.

CHECK WIRELESS DOOR LOCK CONTROL SYSTEM

(a) Check that the function operates normally.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for HV Model): OPERATION CHECK

Result

Proceed to

Wireless door lock function operates normally

A

Wireless door lock function does not operate normally

B
B

GO TO PROBLEM SYMPTOMS TABLE 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): PROBLEM SYMPTOMS TABLE 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, HV Model): PROBLEM SYMPTOMS TABLE

A

3.

READ VALUE USING TECHSTREAM (EACH UNLOCK DETECTION 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.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FR Door Lock Pos

Front door RH unlock detection switch signal

UNLOCK or LOCK

UNLOCK: Front door RH unlocked

LOCK: Front door RH locked

-

FL Door Lock Pos

Front door LH unlock detection switch signal

UNLOCK or LOCK

UNLOCK: Front door LH unlocked

LOCK: Front door LH locked

-

RR-Door Lock Pos SW

Rear door RH unlock detection switch signal

OFF or ON

OFF: Rear door RH locked

ON: Rear door RH unlocked

-

RL-Door Lock Pos SW

Rear door LH unlock detection switch signal

OFF or ON

OFF: Rear door LH locked

ON: Rear door LH unlocked

-

Body Electrical > Main Body > Data List

Tester Display

FR Door Lock Pos

FL Door Lock Pos

RR-Door Lock Pos SW

RL-Door Lock Pos SW

OK:

The Techstream display changes correctly in response to the lock/unlock operation.

NG

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

OK

4.

PERFORM ACTIVE TEST USING TECHSTREAM (WIRELESS BUZZER)

(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 / Active Test.

(e) Perform Active Test according to the display on the Techstream.

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Wireless Buzzer

Wireless door lock buzzer

OFF/ON

-

Body Electrical > Main Body > Active Test

Tester Display

Wireless Buzzer

Result

Proceed to

Wireless door lock buzzer does not sound

A

Wireless door lock buzzer sounds

B
A

GO TO WIRELESS DOOR LOCK CONTROL SYSTEM (NO ANSWER-BACK)

B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL