Step  | Action  | Yes  | No  | 
|---|---|---|---|
1  | Did you perform the Lighting System Diagnostic System Check?  | Go to Step 2  | Go to Diagnostic System Check - Lighting Systems in Lighting Systems.  | 
2  | 
 Do all of the park lamps and license lamps illuminate?  | Go to Testing for Intermittent Conditions and Poor Connections  | Go to Step 3  | 
3  | Using a test lamp, backprobe the inoperable license lamp between the park lamp switch signal circuit and a known good ground. Does the test lamp illuminate?  | Go to Step 5  | Go to Step 4  | 
4  | Repair a poor connection or an open in the park lamp switch signal circuit. Did you complete the repair?  | Go to Step 8  | --  | 
5  | Using a test lamp, backprobe the inoperable license lamp between the park lamp switch signal circuit and the ground circuit. Does the test lamp illuminate?  | Go to Step 7  | Go to Step 6  | 
6  | Repair a poor connection or an open in the ground circuit. Did you complete the repair?  | Go to Step 8  | --  | 
7  | Replace the inoperable license lamp. Refer to the following procedures: Did you complete the repair?  | Go to Step 8  | --  | 
8  | Operate the system in order to verify the repair. Did you correct the condition?  | Go to Step 2  |