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Pinpoint Test B: Single Power Window Is Inoperative (LH)

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 CHECK THE SUPPLY VOLTAGE TO THE LEFT WINDOW REGULATOR CONTROL SWITCH 
    • Disconnect: Left Door Left Window Regulator Control Switch C508.
    • Key in ON position.
    • Measure the voltage between the left door left window regulator control switch connector Pin C508-10, Circuit 170 (R/LB) and ground.
      Fig 1: Measuring Voltage Between Left Door Left Window Regulator Control Switch Connector Circuit 170 (R/LB) And Ground
      G03890966Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to B2.
    • No  : REPAIR Circuit 170 (R/LB) between the left door left window regulator control switch connector C508 and the splice to the left door right window regulator control switch connector C508. TEST the system for normal operation.
  2. B2 CHECK THE GROUND CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the left door left window regulator control switch connector Pins C508-7 and C508-12, Circuits 57 (BK) and ground.
      Fig 2: Measuring Resistance Between Left Door Left Window Regulator Control Switch Connector Circuits 57 (BK) And Ground
      G03890967Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to B3.
    • No  : REPAIR Circuit 57 (BK). TEST the system for normal operation.
  3. B3 CHECK THE SUPPLY VOLTAGE TO THE LEFT POWER WINDOW ELECTRIC DRIVE 
    • Connect: Left Door Left Window Regulator Control Switch C508.
    • Disconnect: Left Window Regulator Electric Drive C524.
    • Key in ON position.
    • Activate the left door left window regulator control switch in the up position and measure the voltage between the left window regulator electric drive connector C524 Circuit 226 (W/BK) and Circuit 227 (Y).
      Fig 3: Measuring Voltage Between Left Window Regulator Electric Drive Connector Circuits 226 And 227
      G03890968Courtesy of FORD MOTOR CO.
    • Activate the left door left window regulator control switch in the down position and measure the voltage between the left window electric drive connector C524 Circuit 227 (Y) and Circuit 226 (W/BK).
      Fig 4: Measuring Voltage Between Left Window Electric Drive Connector Circuits 227 And 226
      G03890969Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts for both circuits? 
    • Yes  : REPLACE the window regulator electric drive. TEST the system for normal operation.
    • No  : REPAIR Circuit 226 (W/BK) or 227 (Y) if damaged. If OK, REPLACE the left door window regulator control switch. TEST the system for normal operation.
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