THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function): Key Luggage Compartment Lock-in Prevention Function does not Operate; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - ]

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM1000000028K95
Model Year Start: 2023	Model: GR Corolla	Prod Date Range: [11/2022 - ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function): Key Luggage Compartment Lock-in Prevention Function does not Operate; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - ]

Key Luggage Compartment Lock-in Prevention Function does not Operate

DESCRIPTION

If the entry luggage compartment lock-in prevention function does not operate, there may be a problem with the communication between the No. 3 indoor electrical key antenna assembly (inside luggage compartment) and electrical key transmitter sub-assembly, wave interference or a malfunction in the certification ECU (smart key ECU assembly).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS 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 GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
The smart key system (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 key system (for Entry Function) after confirming that the communication systems are functioning properly.
Click here
Before replacing the certification ECU (smart key ECU assembly), refer to Precaution.
Click here
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
Check that there are no electrical key transmitter sub-assemblies in the vehicle.

PROCEDURE

1.	CHECK ENTRY LUGGAGE COMPARTMENT OPEN OPERATION

(a) Connect all connectors and check that the entry luggage compartment open function operates.

Click here

Result	Proceed to
Luggage compartment open function operates normally	A
Luggage compartment open function does not operate normally	B

B

GO TO OTHER PROBLEM (Proceed to Luggage Compartment Door Entry Unlock Function does not Operate when Key is Outside Luggage Compartment)

A

2.	CHECK WAVE ENVIRONMENT

(a) Bring the electrical key transmitter sub-assembly near the No. 3 indoor electrical key antenna assembly (inside luggage compartment), and check that the entry luggage compartment lock-in prevention function operates.

NOTICE:

In order to prevent the electrical key transmitter sub-assembly from being locked inside the vehicle, perform this inspection with the window of a door open.

HINT:

Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the No. 3 indoor electrical key antenna assembly (inside luggage compartment).
When the electrical key transmitter sub-assembly is brought near the No. 3 indoor electrical key antenna assembly (inside luggage compartment), the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
If the operation check is normal, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation check.
There may be wave interference if the vehicle is near broadcasting antennas, large video displays, wireless garage door opener systems, wireless security cameras, home security systems, etc. In this case, move the vehicle to a different location and check if there is any improvement.
If a tool for checking radio waves, such as a signal strength meter, is available, move around the area while observing both the LF band (used by the vehicle antenna to form the detection area) and RF band (used by the electrical key transmitter sub-assembly for transmission) to check for locations where there is wave interference.

*a	Inspection Point

Result	Proceed to
Entry functions does not operate normally	A
Entry functions operate normally	B

B

AFFECTED BY WAVE INTERFERENCE

A

3.	CHECK KEY DIAGNOSTIC MODE

(a) Check the following antenna in key diagnostic mode.

Body Electrical > Smart Key > Utility

Tester Display
Communication Check(Key Diag Mode)

(b) Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel.

(1) Check the No. 3 indoor electrical key antenna assembly (inside luggage compartment):

When the electrical key transmitter sub-assembly is at either inspection point, check that the wireless buzzer sounds.

HINT:

If the buzzer sounds, it can be determined that the No. 3 indoor electrical key antenna assembly (inside luggage compartment) is operating normally.
If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

*a	Inspection Point

Result	Proceed to
Wireless buzzer does not sound	A
Wireless buzzer sounds	B

B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

A

4.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT))

(a) Disconnect the O174 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the O40 No. 3 indoor electrical key antenna assembly (inside luggage compartment) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O174-10 (CLG7) - O40-1 (ANTE7)	Always	Below 1 Ω
O174-9 (CG7B) - O40-2 (CLGB)	Always	Below 1 Ω
O174-10 (CLG7) or O40-1 (ANTE7) - Other terminals and body ground	Always	10 kΩ or higher
O174-9 (CG7B) or O40-2 (CLGB) - Other terminals and body ground	Always	10 kΩ or higher

(d) Reconnect the O174 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT))

(a) Using an oscilloscope, check the wave form.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

O40-1 (ANTE7) - O40-2 (CLGB)

Procedure:

Door is closed
Ignition switch off
Electrical key transmitter sub-assembly not inside vehicle
Driver door lock sensor touched

2 V/DIV., 500 ms/DIV.

Pulse generation

(See waveform 1)

*a	Waveform 1

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

6.	REPLACE NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT)

(a) Replace the No. 3 indoor electrical key antenna assembly (inside luggage compartment).

Click here

NEXT

7.	CHECK KEY LOCK-IN PREVENTION FUNCTION

(a) Check that the entry luggage compartment lock-in prevention function operates normally.

Click here

OK:

Entry luggage compartment lock-in prevention function operates normally.

OK

END (NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT) WAS DEFECTIVE)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)