DTC C108B[A2] Parking Aid ECU Internal Failure - Voltage Low (Parking Aid)

1. Parking aid system check

Refer to "75.Driver Assistance System 10W.Troubleshooting(Parking Aid) diagnostic system check - parking aid system controls".

2. Current DTC check

1) Connect the scan tool.

2) Turn ON the ignition switch.

3) Observe the DTC information with a scan tool. Is a DTC set?

Yes

=>Go to Fuse inspection.

No

Go to Intermittent conditions of parking aid system.

Refer to "233.Driver Assistance System 46D.Symptom(Parking Aid) intermittent conditions of parking aid system".

3. Fuse inspection

1) Inspect the ELEC(IG2) 10A fuse. Is the result normal?

Yes

=>Go to Ignition power supply circuit voltage check.

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.

4. Ignition power supply circuit voltage check

1) Disconnect the parking aid system control unit harness connector (C16).

2) Measure the voltage between the ignition power supply circuit (pin 12 of C16) and the body ground with a DMM. Is the voltage more than or equal to the specified value?

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.).

Value: 12 V

Yes

=>Go to Parking aid system control unit harness connector inspection.

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.

5. Parking aid system control unit harness connector inspection

1) Inspect for poor connections at the parking aid system control unit harness connector (pin 12 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 Parking aid system control unit replacement.

No

Repair the connections as necessary.

=>Go to Repair verification.

6. 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.

7. Repair verification

1) Clear the DTC with a scan tool.

2) Turn OFF the ignition switch for 30 seconds or more.

3) Turn ON the ignition switch.

4) Observe the DTC information with a scan tool.