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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 483 (Convertible Top) >> Diagnosis And Testing >> Convertible Top >> Pinpoint Tests >> Pinpoint Test A: The Convertible Top Does Not Raise/Lower >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

The convertible top switch supplies a ground signal to the Body Control Module B (BCM-B) on circuit CPR23 (BU/OG) when the convertible top switch is depressed to the lower position, or circuit CPR24 (GN/VT) when the convertible top switch is depressed to the raise position. Ground is supplied to the convertible top switch through circuit GD139 (BK/YE). The convertible top system will not operate when the vehicle speed is greater than 5 km/h (3 mph) or if the ignition switch is in the START position. The convertible top hydraulic system uses a 12-volt reversible pump and motor assembly. When the BCM-B receives a request to operate the convertible top, the BCM-B sends a signal to the front and rear windows to lower the windows to the full DOWN position. The BCM-B monitors the status of the rear windows on circuit CPW53 (YE/OG) for the right rear window, and circuit CPW47 (VT/OG)/CPW53 (YE/OG) for the left rear window. When the BCM-B detects a full down signal from the RH and LH rear window motors, the convertible top operation is enabled. If the BCM-B does not detect a full down signal from the RH and LH rear window motors, the convertible top operation is disabled. When either the convertible top raise relay or the convertible top lower relay is activated, the other relay will remain in its normal state and supplies ground to the hydraulic motor and pump assembly. The convertible top raise and lower relay coils receive voltage at all times from circuit SBB35 (BU/RD). When the convertible top switch is pressed to the lower position, and the BCM-B detects a full down signal from the LH and RH rear window motors, the BCM-B activates the convertible top lower relay by grounding circuit CPR18 (WH/VT). When the convertible top lower relay is activated, voltage is supplied to the hydraulic motor and pump through circuit CPR20 (BU/BN). Ground is supplied to the hydraulic motor and pump assembly through circuit CPR21 (GN).

When the convertible top switch is pressed in the raise position, and the BCM-B detects a full down signal from the LH and RH rear window motors, the BCM-B activates the convertible top raise relay by grounding circuit CPR19 (YE/BU). When the convertible top raise relay is activated, voltage is supplied to the hydraulic motor and pump assembly through circuit CPR21 (GN). Ground is supplied to the hydraulic motor and pump assembly through circuit CPR20 (BU/BN).

The hydraulic motor/pump assembly is equipped with a thermal circuit breaker. In the event of a concern, the circuit breaker will reset after approximately 5 minutes. The thermal circuit breaker is integral to the hydraulic motor and pump assembly and cannot be serviced separately.

DTC FAULT TRIGGER CONDITIONS

DTC Description Fault Trigger Conditions
  • B1267:11 - Convertible/Folding Top Activation Up Switch: Circuit Short to Ground
 Short to ground in the convertible top switch raise circuit or switch is active in the raise position during self-test.
  • B1268:11 - Convertible/Folding Top Activation Down Switch: Circuit Short to Ground
 Short to ground in the convertible top switch lower circuit or switch is active in the lower position during self-test.
  • B126E:23 - Right Rear Window Fully Down Feedback: Signal Stuck Low
 When the delayed accessory relay is known to be inactive and the RH rear window motor fully down signal is still low, the BCM-B will set this DTC.
  • B126E:24 - Right Rear Window Fully Down Feedback: Signal Stuck High
 When the BCM-B does not see the RH rear window fully down signal pulled low, this DTC will set. Convertible top will not operate when this condition is present.
  • B126F:23 - Left Rear Window Fully Down Feedback: Signal Stuck Low
 When the delayed accessory relay is known to be inactive and the LH rear window motor fully down signal is still low, the BCM-B will set this DTC.
  • B126F:24 - Left Rear Window Fully Down Feedback: Signal Stuck High
 When the BCM-B does not see the LH rear window fully down signal pulled low, this DTC will set. Convertible top will not operate when this condition is present.
  • B1278:12 - Convertible/Foldable Top Up Relay: Circuit Short to Battery
 Short to voltage in the convertible top up relay control circuit.
  • B1278:14 - Convertible/Foldable Top Up Relay: Circuit Short to Ground or Open
 Short to ground or open in convertible top up relay control circuit.
  • B1279:12 - Convertible/Foldable Top Down Relay: Circuit Short to Battery
 Short to voltage in the convertible top down relay control circuit.
  • B1279:14 - Convertible/Foldable Top Down Relay: Circuit Short to Ground or Open
 Short to ground or open in convertible top down relay control circuit.

This pinpoint test is intended to diagnose the following: 

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