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Home >> Ford >> 2004 >> Mustang Mach 1, Standard >> Repair and Diagnosis >> Body & Frame >> Sun Roof/T-Top/Convertible Top >> Convertible Top System >> Diagnosis And Testing >> Convertible Top >> Pinpoint Test A: The Convertible Top Does Not Raise/Lower

Pinpoint Test A: The Convertible Top Does Not Raise/Lower

  1. A1 CHECK THE CONVERTIBLE TOP OPERATION 
    NOTE: The parking brake must be applied for the convertible top system to operate.
    • Key in ON position.
    • Press the convertible top switch in RAISE and LOWER positions while listening for motor operation.
    • Does the convertible top motor assembly operate in both directions? 
    1. Yes:  Go To PINPOINT TEST C: THE CONVERTIBLE TOP DOES NOT RAISE OR DOES NOT GO UP ALL THE WAY .
    2. No:  GO to A2.
  2. A2 CHECK THE POWER SUPPLY TO THE CONVERTIBLE TOP SWITCH 
    • Key in OFF position.
    • Disconnect: Convertible Top Switch C3115.
    • Key in ON position.
    • Measure the voltage between convertible top switch C3115 pin 4, circuit 296 (WH/VT), harness side and ground.
      Fig 1: Checking Power Supply To Convertible Top Switch
      G03243304Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes:  GO to A3.
    2. No:  REPAIR circuit 296 (WH/PK). TEST the system for normal operation.
  3. A3 CHECK CIRCUIT 588 (VT) FOR AN OPEN 
    • Key in OFF position.
    • Connect: Convertible Top Switch C3115.
    • Disconnect: Raise Relay C4063.
    • Key in ON position.
    • Press and hold the convertible top switch in the RAISE position.
    • Measure the voltage between raise relay C4063 pin 86, circuit 588 (VT), harness side and ground.
      Fig 2: Checking Circuit 588 (VT) For Open
      G03243305Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes:  GO to A4.
    2. No:  GO to  A5.
  4. A4 CHECK CIRCUIT 688 (GY/LB) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Lower Relay C4064.
    • Key in ON position.
    • Press and hold the convertible top switch in the LOWER position.
    • Measure the voltage between lower relay C4064 pin 86, circuit 688 (GY/LB), harness side and ground.
      Fig 3: Checking Circuit 688 (GY/LB) Voltage
      G03243306Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes:  GO to  A7.
    2. No:  GO to  A6.
  5. A5 CHECK CIRCUIT 588 (VT) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Convertible Top Switch C3115.
    • Measure the resistance between convertible top switch C3115 pin 3, circuit 588 (VT), harness side and raise relay C4063 pin 86, circuit 588 (VT), harness side.
      Fig 4: Checking Circuit 588 (VT) For Open
      G03243307Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  INSTALL a new convertible top switch. REFER to CONVERTIBLE TOP SWITCH . TEST the system for normal operation.
    2. No:  REPAIR circuit 588 (VT). TEST the system for normal operation.
  6. A6 CHECK CIRCUIT 688 (GY/LB) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Convertible Top Switch C3115.
    • Measure the resistance between convertible top switch C3115 pin 5, circuit 688 (GY/LB), harness side and lower relay C4064 pin 86, circuit 688 (GY/LB), harness side.
      Fig 5: Checking Circuit 688 (GY/LB) For Open
      G03243308Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  INSTALL a new convertible top switch. REFER to CONVERTIBLE TOP SWITCH . TEST the system for normal operation.
    2. No:  REPAIR circuit 688 (GY/LB). TEST the system for normal operation.
  7. A7 CHECK THE BATTERY SUPPLY TO THE RELAYS 
    • Measure the voltage between raise relay C4063 pin 87, circuit 170 (RD/LB), harness side and ground; and between lower relay C4064 pin 87, circuit 170 (RD/LB), harness side and ground.
      Fig 6: Checking Battery Supply To Relays
      G03243309Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    1. Yes:  GO to A8.
    2. No:  REPAIR circuit 170 (RD/LB). TEST the system for normal operation.
  8. A8 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between raise relay C4063 pin 87A, circuit 1205 (BK), harness side and ground; and between lower relay C4064 pin 87A, circuit 1205 (BK), harness side and ground.
      Fig 7: Checking Circuit 1205 (BK) For Open
      G03243310Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. Yes:  GO to A9.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  9. A9 CHECK FOR PARKING BRAKE GROUND 
    • Measure the resistance between raise relay C4063 pin 85, circuit 977 (VT/WH), harness side and ground; and between lower relay C4064 pin 85, circuit 977 (VT/WH), harness side and ground.
      Fig 8: Checking For Parking Brake Ground
      G03243311Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. Yes:  GO to  A11.
    2. No:  GO to A10.
  10. A10 CHECK THE PARKING BRAKE SWITCH 
    • Disconnect: Parking Brake Switch C306.
    • Measure the resistance between raise relay C4063 pin 85, circuit 977 (VT/WH), harness side and parking brake switch C306 pin 1, circuit 22 (LB/BK), harness side; and between lower relay C4064 pin 85, circuit 977 (VT/WH), harness side and parking brake switch C306 pin 1, circuit 22 (LB/BK), harness side.
      Fig 9: Checking Parking Brake Switch
      G03243312Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. Yes:  INSTALL a new parking brake switch. REFER to DISC . TEST the system for normal operation.
    2. No:  REPAIR the circuit in question. TEST the system for normal operation.
  11. A11 CHECK THE CONVERTIBLE TOP MOTOR LOWER CIRCUIT 
    • Connect: Raise Relay C4063.
    • Connect: Lower Relay C4064.
    • Disconnect: Convertible Top Motor C4062.
    • Measure the resistance between convertible top motor C4062 pin 2, circuit 902 (YE), harness side and ground.
      Fig 10: Checking Convertible Top Motor Lower Circuit
      G03243313Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  GO to  A13.
    2. No:  GO to A12.
  12. A12 CHECK CIRCUIT 902 (YE) FOR AN OPEN 
    • Disconnect: Lower Relay C4064.
    • Measure the resistance between lower relay C4064 pin 30, circuit 902 (YE), harness side and convertible top motor C4062 pin 2, circuit 902 (YE), harness side.
      Fig 11: Checking Circuit 902 (YE) For Open
      G03243314Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  INSTALL a new lower relay. TEST the system for normal operation.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  13. A13 CHECK THE LOWER INPUT TO THE MOTOR 
    • Key in ON position.
    • Measure the voltage between convertible top motor C4062 pin 2, circuit 902 (YE), harness side and ground.
      Fig 12: Checking Lower Input To Motor
      G03243315Courtesy of FORD MOTOR CO.
    • Press and hold the convertible top switch in the LOWER position.
    • Is the voltage greater than 10 volts? 
    1. Yes:  GO to A14.
    2. No:  INSTALL a new lower relay. TEST the system for normal operation.
  14. A14 CHECK THE CONVERTIBLE TOP MOTOR RAISE CIRCUIT 
    • Key in OFF position.
    • Measure the resistance between convertible top motor C4062 pin 1, circuit 903 (RD), harness side and ground.
      Fig 13: Checking Convertible Top Motor Raise Circuit
      G03243316Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  GO to  A16.
    2. No:  GO to A15.
  15. A15 CHECK CIRCUIT 903 (RD) FOR AN OPEN 
    • Disconnect: Raise Relay C4063.
    • Measure the resistance between raise relay C4063 pin 30, circuit 903 (RD), harness side and convertible top motor C4062 pin 1, circuit 903 (RD), harness side.
      Fig 14: Checking Circuit 903 (RD) For Open
      G03243317Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  INSTALL a new raise relay. TEST the system for normal operation.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  16. A16 CHECK THE RAISE INPUT TO THE MOTOR 
    • Key in ON position.
    • Press and hold the convertible top switch in the RAISE position.
    • Measure the voltage between convertible top motor C4062 pin 1, circuit 903 (RD), harness side and ground.
      Fig 15: Checking Raise Input To Motor
      G03243318Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes:  INSTALL a new convertible top motor. REFER to HYDRAULIC SYSTEM, LIFT CYLINDER AND MOTOR . TEST the system for normal operation.
    2. No:  INSTALL a new raise relay. TEST the system for normal operation.
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