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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1418 (Exterior Lighting System) >> Diagnostic Tests >> Stoplamps >> Pinpoint Tests >> Pinpoint Test H: The Stoplamps Are Inoperative >> Pinpoint Test H: The STOPLAMPS Are Inoperative

Pinpoint Test H: The STOPLAMPS Are Inoperative

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. H1 CHECK CIRCUIT 1119 (RD) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Stoplamp Switch C278
      • Fig 1: Measuring Voltage
      GF0011078Courtesy of FORD MOTOR CO.
    • Measure the voltage between the stoplamp switch C278-1, circuit 1119 (RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  H2.
    2. NO  : VERIFY the BJB fuse 14 (20A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  2. H2 CHECK CIRCUIT 10 (LG/RD) FOR AN OPEN 
      Fig 2: Connecting Fused Jumper Wire
      GF0011080Courtesy of FORD MOTOR CO.
    • Connect a fused (20A) jumper wire between the stoplamp switch C278-1, circuit 1119 (RD), harness side and the stoplamp switch C278-2, circuit 10 (LG/RD), harness side.
    • Do the stoplamps illuminate? 
    1. YES  : REMOVE the jumper wire. INSTALL a new stoplamp switch. REFER to Stoplamp Switch . TEST the system for normal operation.
    2. NO  : REMOVE the jumper wire. REPAIR the circuit. TEST the system for normal operation.
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