- Power source circuit of millimeter wave radar sensor assembly
- Millimeter wave radar sensor assembly ground circuit
- Millimeter wave radar sensor assembly
| Last Modified: 01-27-2025 | 6.11:8.1.0 | Doc ID: RM1000000028ABV |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [11/2022 - ] |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Millimeter Wave Radar Sensor Communication Stop Mode; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 - ] | ||
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Millimeter Wave Radar Sensor Communication Stop Mode |
DESCRIPTION
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Detection Item |
Symptom |
Trouble Area |
|---|---|---|
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Millimeter Wave Radar Sensor Communication Stop Mode |
Communication stop for "Front Radar" is indicated on the "Communication Bus Check" screen of the GTS.
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
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Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
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![2023 MY Corolla Corolla Hatchback GR Corolla [11/2022 - 08/2023]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
- Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 10 minutes or more before measuring the resistance.
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After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.
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When disconnecting and reconnecting the battery.
HINT:
When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.
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Some parts must be initialized and set when replacing or removing and installing parts.
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After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
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After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
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- Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
- Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
- When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
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1. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the A128 millimeter wave radar sensor assembly connector.
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(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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(d) Reconnect the cable to the negative (-) battery terminal.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
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Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A128-1 (IGB) - Body ground |
Ignition switch ON |
11 to 14 V |
| OK |
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| NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
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