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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Exterior Lighting System) >> Diagnostic Tests >> Public Safety - Police Package >> Pinpoint Tests >> Pinpoint Test AA: The Rear Deck Light Emitting Diode (LED) Flasher Is Inoperative >> Pinpoint Test Aa: The Rear Deck Light Emitting Diode (Led) Flasher Is Inoperative

Pinpoint Test Aa: The Rear Deck Light Emitting Diode (Led) Flasher Is Inoperative

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. AA1 CHECK THE REAR DECK LED FLASHER 
    • Key in OFF position.
    • Disconnect: Rear Deck LED Flasher C4234
      • Fig 1: Connecting Fused Jumper Wire
      GF0014590Courtesy of FORD MOTOR CO.
    • Connect a fused (5A) jumper wire between the rear deck LED flasher C4234 pin 2, component side and battery voltage; and connect a jumper wire between the rear deck LED flasher C4234 pin 3, component side and ground.
    • Do the rear deck LED flashing lights alternate flashing on and off? 
    1. YES  : REMOVE the jumper wires. Go to  AA2 .
    2. NO  : INSTALL a new rear deck LED flasher. TEST the system for normal operation.
  2. AA2 CHECK THE REAR DECK LED FLASHER GROUND CIRCUIT FOR AN OPEN 
      Fig 2: Checking Circuit For Open
      GF0014591Courtesy of FORD MOTOR CO.
    • Measure the resistance between the rear deck LED flasher C4234-3, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR circuit 23 (TN/LG) for an open. TEST the system for normal operation.
    2. NO  : REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.
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