1. Headlight auto leveling system check
Refer to "65.Lighting Control 10J.Troubleshooting(Headlight Automatic Leveling Control) diagnostic system check-headlight auto leveling controls".
2. Current DTC check
1) Connect the scan tool.
2) Turn OFF the ignition switch.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool. Is a DTC set?
Yes
=>Go to Vehicle height value initialization of headlight auto leveling control unit.
No
Go to Intermittent conditions of lighting control system.
Refer to "224.Lighting Control 37D.Symptom(Headlight Automatic Leveling Control) intermittent conditions of lighting control system".
3. Vehicle height value initialization of headlight auto leveling control unit
1) Perform initialization of the vehicle height values.
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control headlight auto leveling control unit setting".
Procedure completion
=>Go to Current DTC follow-up check.
4. Current DTC follow-up check
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool. Is a DTC set?
Yes
=>Go to Headlight auto leveling control unit replacement.
No
=>Go to Repair verification.
5. Headlight auto leveling control unit replacement
Note
- Perform initialization of the vehicle height values after replacing the headlight auto leveling control unit.
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control headlight auto leveling control unit removal".
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control headlight auto leveling control unit installation".
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control headlight auto leveling control unit setting".
Procedure completion
=>Go to Repair verification.
6. Repair verification
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch.
3) Turn ON the ignition switch.
4) Observe the DTC information with a scan tool.