Lost communication with the parking aid system control unit (models with radar sensor/ stereo camera) (Parking Aid)

1. Scan tool power-up check

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 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".

2. Parking aid system control unit communication verification

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

=>Go to Central gateway control unit communication verification.

3. 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.

Refer to "64.Body Control 10I.Troubleshooting(Central GateWay) lost communication with the central gateway control unit".

4. Chassis CAN communication circuit communication verification

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

=>Go to Fuse inspection.

No

Go to Chassis CAN communication circuit inspection.

Refer to "64.Body Control 10I.Troubleshooting(Central GateWay) chassis CAN communication circuit inspection".

5. Fuse inspection

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.

=>Go to Repair verification.

6. Parking aid system control unit harness connector inspection

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

=>Go to Inspection for open circuit in parking aid system control unit ignition power supply circuit.

No

Repair the connections as necessary.

=>Go to Repair verification.

7. Inspection for open circuit in parking aid system control unit ignition power supply circuit

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).

=>Go to Repair verification.

8. Inspection for open circuit in parking aid system control unit ground circuit

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 Chassis 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.

=>Go to Repair verification.

9. Chassis CAN communication circuit inspection

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 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 Parking aid system control unit replacement.

No

Repair the circuit as necessary.

=>Go to Repair verification.

10. Parking aid system control unit replacement

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control parking aid system control unit removal".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control parking aid system control unit installation".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control parking aid system control unit setting".

Procedure completion

=>Go to Repair verification.

11. Repair verification

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.