How to Proceed With Trouble Diagnosis

How to Proceed with Trouble Diagnosis
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT-138, "System Description". Description and Operation
3. Perform Preliminary Check. Refer to LT-154, "Preliminary Check". Preliminary Check
4. Check symptom and repair or replace the cause of malfunction.
5. Does interior room lamp operate normally? If YES, GO TO 6. If NO, GO TO 4.
6. INSPECTION END