1) Connect the scan tool.
2) Power up the scan tool. Does the scan tool power up?
Yes
=>Go to Radar sensor (Left) communication verification.
No
Go to Scan tool does not power up.
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) Scan tool does not power up".
Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) Scan tool does not power up".
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Scan tool does not power up".
1) Verify that communication can be established with the radar sensor (Left) using the scan tool. Can communication with the radar sensor (Left) be established?
Yes
Go to Intermittent conditions of radar sensor system.
Refer to "233.Driver Assistance System 46D.Symptom(Radar Sensor) intermittent conditions of radar sensor system".
No
=>Go to Central gateway control unit communication verification.
1) Verify communication with the central gateway control unit using the scan tool. Can communication with the central gateway control unit be established?
Yes
=>Go to Chassis CAN communication circuit communication verification.
No
Go to Lost communication with the central gateway control unit.
1) Verify that communication can be established with the following control modules using a scan tool. Can communication with all the control modules be established?
Yes
No
Go to Chassis CAN communication circuit inspection.
Refer to "64.Body Control 10I.Troubleshooting(Central GateWay) chassis CAN communication circuit inspection".
1) Inspect the ELEC(IG2) 10A fuse for a blowout. Is the result normal?
Yes
=>Go to Radar sensor (Left) harness connector inspection.
No
Replace the fuse. If the fuse blows out again, repair the short to ground in the circuits relating to the ELEC(IG2) 10A fuse.
1) Inspect for poor connections at the radar sensor (Left) harness connector (pins 1 and 6 of R41). Is the result normal?
Refer to "LHD Radar Sensor" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Radar Sensor" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
=>Go to Inspection for open circuit in the radar sensor (Left) power supply circuit.
No
Repair the connections as necessary.
1) Disconnect the radar sensor (Left) harness connector (R41).
2) Connect a test lamp between the ignition power supply circuit (pin 1 of R41) and the body ground.
Refer to "LHD Radar Sensor" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Radar Sensor" in the ETM (wiring diagram). (Open using the ETM viewer.).
3) Turn ON the ignition switch. Does the test lamp illuminate?
Yes
=>Go to Inspection for open circuit in radar sensor (Left) ground circuit.
No
Repair the open circuit or high resistance in the ignition power supply circuit between the ELEC(IG2) 10A fuse and the radar sensor (Left) (pin 1 of R41).
1) Connect a test lamp between the ignition power supply circuit and the ground circuit (pins 1 and 6 of R41) of the radar sensor (Left) harness connector.
Refer to "LHD Radar Sensor" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Radar Sensor" in the ETM (wiring diagram). (Open using the ETM viewer.).
2) Turn ON the ignition switch. Does the test lamp illuminate?
Yes
=>Go to Inspection for open circuit and short circuit in Chassis CAN communication circuit.
No
Repair the open circuit or high resistance in the ground circuit between the radar sensor (Left) (pin 6 of R41) and the body ground.
1) Inspect the Chassis CAN Low circuit and Chassis CAN High circuit between the radar sensor (Left) (pins 2 and 5 of R41) and the central gateway control unit (pins 1 and 2 of B41) for the following. Is the result normal?
Refer to "LHD Controller Area Network (Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 with DPD))" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Controller Area Network (Central Gateway C/U (4JJ3 without DPD, RZ4E))" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
=>Go to Radar sensor (Left) replacement.
No
Repair the circuit as necessary.
Note
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. radar sensor removal".
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. radar sensor installation".
Refer to "9.Body, Cab, Accessories 9E.Instrumentation, Driver Info. radar sensor setting".
Procedure completion
1) Securely connect the disconnected harness connectors.
2) Turn OFF the ignition switch for 30 seconds or more.
3) Connect the scan tool.
4) Turn ON the ignition switch.
5) Verify that communication can be established with the radar sensor (Left) using the scan tool. Can communication with the radar sensor (Left) be established?
Yes
The system is normal.
No