PINPOINT TEST B : All Flashing LEDs Are Inoperative: Notes

Diagnostic Overview 

All Flashing LEDs Are Inoperative 

Normal Operation and Fault Conditions 

Refer to Flashing LEDs .

Possible Sources 

• Fuse(s)
• Wiring, terminals or connectors
• Control head
• Lighting and siren control module
• Lighting relay center

Visual Inspection and Diagnostic Pre-checks 

• Verify the lighting relay center or lighting and siren control module 40A main power fuse is OK.
• Verify the lighting relay center or lighting and siren control module 10A output fuses are OK.
• Check for stuck or broken buttons on the control head.