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Home >> Ford >> 2005 >> Excursion 5.4 L, RWD >> Repair and Diagnosis >> Electrical >> Gauges >> Instrument Cluster And Panel Illumination >> Diagnosis And Testing >> Instrument Panel Illumination >> Pinpoint Tests >> Pinpoint Test E: A Single Illumination Source Is Inoperative

Pinpoint Test E: A Single Illumination Source Is Inoperative

  1. E1 CHECK THE VOLTAGE TO THE INOPERATIVE ILLUMINATION SOURCE 
    • Key in OFF position.
    • Disconnect: Inoperative Illumination Source.
    • Place the headlamp switch in the ON position.
    • Rotate the panel dimmer switch to the full illumination position.
    • Measure the voltage between the single illumination source, circuit 19 (LB/RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to E2.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  2. E2 CHECK THE SINGLE ILLUMINATION SOURCE GROUND 
    • Place the headlamp switch in the ON position.
    • Measure the resistance between single illumination source, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new component in question. TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
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