| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001HGK7 |
| Model Year Start: 2020 | Model: GR Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (for Gasoline Model): Ignition Switch Circuit; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022] | ||
|
Ignition Switch Circuit |
DESCRIPTION
The main body ECU (multiplex network body ECU) determines the ignition switch position (LOCK, ACC, ON) based on signals from the IG and ACC circuit.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (ACC SW, IG SW) |
(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 / 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 |
|---|---|---|---|---|
|
ACC SW |
Ignition switch |
OFF or ON |
OFF: Ignition switch off ON: Ignition switch ACC |
- |
|
IG SW |
Ignition switch |
OFF or ON |
OFF: Ignition switch off or ACC ON: Ignition switch ON |
- |
Body Electrical > Main Body > Data List
|
Tester Display |
|---|
|
ACC SW |
|
IG SW |
OK:
The Techstream display changes correctly in response to the ignition switch state.
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
|
2. |
INSPECT IGNITION OR STARTER SWITCH ASSEMBLY |
(a) Remove the ignition or starter switch assembly.
M20A-FKS: Click here
![2020 - 2025 MY Corolla Corolla Hatchback [01/2019 - ]; M20A-FKS (STARTING): IGNITION SWITCH: REMOVAL](/t3Portal/stylegraphics/info.gif)
2ZR-FAE: Click here
(b) Inspect the ignition or starter switch assembly.
M20A-FKS: Click here
2ZR-FAE: Click here
| NG |
|
REPLACE IGNITION OR STARTER SWITCH ASSEMBLY M20A-FKS: Click here
2ZR-FAE: Click here
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the 4C and 4D instrument panel junction block assembly connectors.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4C-1 - Body ground |
Always |
11 to 14 V |
|
4D-1 - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND) |
(a) Disconnect the 4F 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 |
|---|---|---|
|
4F-3 - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(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 |
|---|---|---|
|
I12-8 (IG1) - 4E-17 |
Always |
Below 1 Ω |
|
I12-6 (ACC) - 4E-30 |
Always |
Below 1 Ω |
|
I12-7 (AM1) - 4E-44 |
Always |
Below 1 Ω |
|
I12-8 (IG1) or 4E-17 - Other terminals and body ground |
Always |
10 kΩ or higher |
|
I12-6 (ACC) or 4E-30 - Other terminals and body ground |
Always |
10 kΩ or higher |
|
I12-7 (AM1) or 4E-44 - Other terminals and body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
6. |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Temporarily replace the instrument panel junction block assembly with a new or known good one.
Click here
|
|
7. |
CHECK THEFT DETERRENT SYSTEM |
(a) Check the active arming mode function.
Click here
OK:
The active arming mode function operates normally.
| OK |
|
END (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY WAS DEFECTIVE) |
| NG |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
|
|