Principles Of Operation

Convertible Top

Principles of Operation

The convertible top system is controlled by the Body Control Module B (BCM-B). The convertible top will only function when the accessory delay relay is active and vehicle speed is less than 5 km/h (3 mph). When the convertible top switch is activated, the BCM-B commands the front and rear windows to the full DOWN position. The BCM-B will disable/inhibit the rear quarter window control switch from operating the rear quarter windows when the convertible top ajar switch indicates the convertible top is not in the full UP or full DOWN position. When the BCM-B detects that the LH and RH rear window motors are in the full downward position, it will command the appropriate relay to close in order to raise or lower the convertible top. If the BCM-B does not detect a full down signal from the LH and RH rear window motors, the convertible top operation will be disabled.

The convertible top assembly is a floating frame, Z-fold design. The main pivot brackets are attached to the body, and the convertible top frame side rails expand or fold when the convertible top is raised or lowered. The LH and RH stay pads are attached to the convertible top frame bows, and provide the main source of tension for the convertible top material. When the convertible top is in the full DOWN position, it is stored in the compartment behind the rear seat backrest. When the convertible top is in the full UP position, the body provides a stop which the convertible top frame No. 5 bow contacts to provide a weather seal for the convertible top against the body.

The convertible top hydraulic system uses a reversible hydraulic pump and motor assembly. When activated, the hydraulic pump uses hydraulic pressure to extend the hydraulic lift cylinders to raise the convertible top, or retract the hydraulic lift cylinders to lower the convertible top. 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. In the event of a hydraulic system failure, the convertible top cannot be operated manually.