CAN COMMUNICATION SYSTEM(for RHD) Millimeter Wave Radar Sensor Communication Stop Mode
DESCRIPTION
| Detection Item | Symptom | Trouble Area |
|---|---|---|
| Millimeter Wave Radar Sensor Communication Stop Mode | Either condition is met:
|
|
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For vehicles with a pre-crash safety system.
WIRING DIAGRAM
| *a | No. 1 CAN Junction Connector |
| *b | from RR-IG1 RLY1 Relay |
| *c | Millimeter Wave Radar Sensor Assembly |
CAUTION / NOTICE / HINT
Note
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Before measuring the resistance of the CAN bus, turn the engine 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 1 minute or more before measuring the resistance.
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After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
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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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After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
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DTC check procedure: Turn the engine switch on (IG), wait at least 60 seconds, and then drive the vehicle at a speed of 5 km/h (3 mph) or more for 4 seconds 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.
Tech Tips
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Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
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Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
PROCEDURE
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CHECK FOR OPEN IN CAN BUS WIRE (MILLIMETER WAVE RADAR SENSOR ASSEMBLY BRANCH WIRE)
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*a Front view of wire harness connector
(to Millimeter Wave Radar Sensor Assembly)
Disconnect the cable from the negative (-) battery terminal.
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Disconnect the millimeter wave radar sensor assembly connector.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition B5-3 (CA2H) - B5-2 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Result Proceed to OK NG
NG 
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY)
OK 
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CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BATTERY AND BODY GROUND)
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*a Front view of wire harness connector
(to Millimeter Wave Radar Sensor Assembly)
Reconnect the cable to the negative (-) battery terminal.
Note
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.
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Measure the voltage according to the value(s) in the table below.
Standard Voltage Tester Connection Switch Condition Specified Condition B5-8 (IGB) - Body ground Engine switch on (IG) 11 to 14 V -
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition B5-1 (SGND) - Body ground Always Below 1 Ω Result Proceed to OK NG
OK
REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
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