| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001HEEM |
| Model Year Start: 2020 | Model: GR Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: DOOR LOCK: KEY REMINDER WARNING SYSTEM: Key Reminder Buzzer does not Sound; 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022] | ||
|
Key Reminder Buzzer does not Sound |
DESCRIPTION
The key reminder warning buzzer sounds when the driver door is opened while the ignition switch is off or ACC. The key reminder warning buzzer is activated when the main body ECU (multiplex network body ECU) sends an unlock warning switch signal and driver door courtesy light switch signal to the combination meter assembly via CAN communication.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
The key reminder warning system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the key reminder warning system after confirming that the communication systems are functioning properly.
Click here
![2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; DOOR LOCK: KEY REMINDER WARNING SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
PROCEDURE
|
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (BUZZER OPERATION) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Combination Meter > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Buzzer Operation (800Hz, Vol L, W/ Damping) |
Combination meter buzzer
|
ON |
- |
Body Electrical > Combination Meter > Active Test
|
Tester Display |
|---|
|
Buzzer Operation (800Hz, Vol L, W/ Damping) |
OK:
Combination meter buzzer sounds
| NG |
|
REPLACE COMBINATION METER ASSEMBLY
|
|
|
2. |
READ VALUE USING TECHSTREAM (FL DOOR COURTESY SW) |
(a) Enter the following menus: Body Electrical / Main Body / Data List.
(b) 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 |
|---|---|---|---|---|
|
FL Door Courtesy SW |
Front door courtesy light switch assembly (for LH) signal |
OFF or ON |
OFF: Front door LH closed ON: Front door LH open |
- |
Body Electrical > Main Body > Data List
|
Tester Display |
|---|
|
FR Door Courtesy SW |
OK:
The Techstream indicates ON or OFF according to the driver door conditions shown in the table.
| NG |
|
|
|
3. |
READ VALUE USING TECHSTREAM (KEY UNLOCK WARNING SW) |
(a) 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 |
|---|---|---|---|---|
|
Key Unlock Warning SW |
Unlock warning switch signal |
OFF or ON |
OFF: No key in ignition key cylinder ON: Key in ignition key cylinder |
- |
Body Electrical > Main Body > Data List
|
Tester Display |
|---|
|
Key Unlock Warning SW |
OK:
The Techstream indicates ON or OFF according to whether the key is in the ignition key cylinder.
| OK |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
|
|
4. |
INSPECT UNLOCK WARNING SWITCH ASSEMBLY |
(a) Remove the unlock warning switch assembly.
Click here
(b) Inspect the unlock warning switch assembly.
Click here
| NG |
|
|
|
5. |
CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND) |
(a) Disconnect the 4E 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 |
|---|---|---|
|
4E-41 - I13-1 (UN+) |
Always |
Below 1 Ω |
|
I13-2 (UN-) - Body ground |
Always |
Below 1 Ω |
|
I13-1 (UN+) or 4E-41 - Other terminals and body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
6. |
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the instrument panel junction block assembly.
Click here
|
*a |
Component without harness connected (Instrument Panel Junction Block Assembly) |
- |
- |
(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4E-41 - MB-3 (KSW) |
Always |
Below 1 Ω |
| OK |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG |
|
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
|
|