Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001HAN7
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for HV Model): No Answer-Back; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

No Answer-Back

DESCRIPTION

In some cases, wireless door lock control functions are normal but the hazard warning light and wireless door lock buzzer answer-back function do not operate. In such cases, hazard warning light and wireless door lock buzzer signal outputs from the main body ECU (multiplex network body ECU) may be malfunctioning.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The wireless door lock control system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the wireless door lock control system after confirming that the communication system is functioning properly.

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

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

  • Before performing the inspection, check that DTC B1242 is not output.

PROCEDURE

1.

CHECK CUSTOMIZE SETTING USING TECHSTREAM (HAZARD ANSWER BACK, WIRELESS BUZZER RESP, WIRELESS BUZZER VOL)

(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.

(e) Select the setting by referring to the table below.

Wireless Door Lock

Tester Display

Description

Default

Setting

ECU

Hazard Answer Back

Function that flashes the hazard warning lights once when the doors are locked by wireless operation and twice when the doors are unlocked by wireless operation

ON

0:OFF,1:ON

Main body ECU (Multiplex network body ECU)

Wireless Buzzer Resp

Function that enables/disables the wireless door lock buzzer response

ON

0:OFF,1:ON

Main body ECU (Multiplex network body ECU)

Wireless Buzzer Vol

Function that adjusts the wireless door lock buzzer volume

Level5

0000:Level7,0001:Level6,0010:Level5,0011:Level4,0100:Level3,0101:Level2,0110:Level1,0111:Level0

Main body ECU (Multiplex network body ECU)

Result

Proceed to

All settings are ON and other than Level0

A

A setting is OFF or Level0

B
B

PERFORM CUSTOMIZE FUNCTION

A

2.

CHECK WIRELESS DOOR LOCK CONTROL FUNCTIONS

(a) Check the wireless door lock control function using the electrical key transmitter sub-assembly.

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/unlock operates properly

A

Wireless door lock/unlock does not operate properly

B
B

GO TO PROBLEM SYMPTOMS TABLE

A

3.

READ VALUE USING TECHSTREAM (FR DOOR LOCK POS, FL DOOR LOCK POS, RR-DOOR LOCK POS SW, RL-DOOR LOCK POS SW)

(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

LOCK or UNLOCK

LOCK: Front door RH locked

UNLOCK: Front door RH unlocked

-

FL Door Lock Pos

Front door LH unlock detection switch signal

LOCK or UNLOCK

LOCK: Front door LH locked

UNLOCK: Front door LH unlocked

-

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

*1

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

*2
  • *1: When checking RR-Door Lock Pos SW, make sure to check it with the rear door LH locked.
  • *2: When checking RL-Door Lock Pos SW, make sure to check it with the rear door RH locked.

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.

CHECK WIRELESS ANSWER-BACK OPERATION

(a) Check the wireless answer-back operation using the electrical key transmitter sub-assembly.

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

Only wireless door lock buzzer answer-back does not occur.

A

Only hazard warning light answer-back does not occur.

B
B

GO TO STEP 9

A

5.

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 the 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
B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

A

6.

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Disconnect the A32 wireless door lock buzzer connector.

(b) Perform the 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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A32-1 (B) - A32-2 (E)

Procedure:

  1. Turn power switch off
  2. Close all doors
  3. Bring electrical key transmitter sub-assembly outside detection area but within wireless function operational area
  4. Press lock or unlock switch of electrical key transmitter sub-assembly

Below 1 V → Pulse generation

*a

Front view of wire harness connector

(to Wireless Door Lock Buzzer)
OK

REPLACE WIRELESS DOOR LOCK BUZZER

NG

7.

CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

(b) Reconnect the instrument panel junction block assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A32-1 (B) - MB-21 (BZR)

Always

Below 1 Ω

A32-2 (E) - Body ground

Always

Below 1 Ω

A32-1 (B) or MB-21 (BZR) - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

NG

8.

CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 4B instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A32-1 (B) - 4B-29

Always

Below 1 Ω

A32-1 (B) or 4B-29 - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

CHECK HAZARD WARNING LIGHTS OPERATION

(a) Check that the hazard warning lights blink when the hazard warning signal switch is pressed.

OK:

Hazard warning lights blink.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

NG

GO TO LIGHTING SYSTEM (Proceed to Hazard Warning Switch Circuit)