1) Connect the scan tool.
2) Power up the scan tool. Does the scan tool power up?
Yes
=>Go to Parking aid system control unit communication verification.
No
Go to 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) Turn ON the ignition switch.
2) Verify that communication can be established with the parking aid system control unit. Can communication with the parking aid system control unit be established?
Yes
Go to Intermittent conditions of parking aid system.
Refer to "233.Driver Assistance System 46D.Symptom(Parking Aid) intermittent conditions of parking aid system".
No
1) Inspect for poor connections at the DLC (pins 6 and 14 of C19). Is the connection status normal?
Refer to "LHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
No
Repair the connections as necessary.
1) Inspect the ELEC(IG2) 10A fuse. Is the result normal?
Yes
=>Go to Parking aid system control unit harness connector inspection.
No
Replace the fuse. If the fuse blows out again, repair the short to ground in the circuits relating to the fuse.
1) Inspect for poor connections at the parking aid system control unit harness connector (pins 5, 6, 12, and 15 of C16). Is the connection status normal?
Refer to "LHD Parking Aid" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Parking Aid" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
No
Repair the connections as necessary.
1) Disconnect the parking aid system control unit harness connector (C16).
2) Connect a test lamp between the ignition power supply circuit (pin 12 of C16) and the body ground.
Refer to "LHD Parking Aid" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Parking Aid" 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 parking aid system control unit ground circuit.
No
Repair the open circuit or high resistance in the ignition power supply circuit between the ELEC(IG2) 10A fuse and the parking aid system control unit (pin 12 of C16).
1) Connect a test lamp between the ignition power supply circuit (pin 12 of C16) and the ground circuit (pin 15 of C16). Does the test lamp illuminate?
Refer to "LHD Parking Aid" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Parking Aid" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
=>Go to CAN communication circuit inspection.
No
Repair the open circuit or high resistance in the ground circuit between the parking aid system control unit (pin 15 of C16) and the body ground.
1) Inspect the CAN Low circuit and CAN High circuit between the parking aid system control unit (pins 5 and 6 of C16) and the DLC (pins 6 and 14 of C19) for the following. Is the result normal?
Refer to "LHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Controller Area Network (Except Central Gateway C/U)" in the ETM (wiring diagram). (Open using the ETM viewer.).
Yes
=>Go to Parking aid system control unit replacement.
No
Repair the circuit as necessary.
Note
Procedure completion
1) Securely connect the disconnected harness connectors.
2) Connect the scan tool.
3) Turn ON the ignition switch.
4) Verify that communication can be established with the parking aid system control unit using the scan tool. Can communication with the parking aid system control unit be established?
Yes
The system is normal.
No
=>Go to Parking aid system control unit harness connector inspection.