System Description

The power top system allows the convertible top to be raised and lowered electrically by actuating a switch in the center floor console. The power top system receives battery feed through a fuse in the Power Distribution Center (PDC), only when the ignition switch is in the ON position.

The operation of the power top is controlled by the Body Control Module (BCM). The BCM also controls the "top down/4 window down feature when the power top switch is pressed to the second detent position.

Power Top Components:

The main components of the power top system are:
- The power top framework and bows
- The motor/hydraulic pump assembly
- The power top well
- The power top relay assembly
- The power top pivot bracket
- The latch system
- The window regulator modules

The power top motor is part of the motor/hydraulic pump assembly and cannot be serviced separately. If the motor is inoperative the complete assembly must be replaced.

The power top switch is hard wired to the Body Control Module (BCM) through the Power Top Switch Mux circuit. The BCM supplies a multiplexed voltage of approximately 90% of ignition voltage to the power top switch. Through a series of resistors the power top switch switches the circuit to ground. The circuit resistance is varied depending on the switch position. When a top operation input is received by the BCM, it will ground the respective power top relay control circuit which in turn will operate the power top motor. If the power top switch is pressed and held to the down position second detent, the BCM will command the window drop relay assembly to drop all windows to the fully down position.

The power top switch (convertible vehicles only) has three distinct functions:
- Top Down - This is the first detent on the down side of the switch. Holding the switch in this position will lower the top only.
- Top Down/4 window down - This is the second detent on the switch. Holding the switch in this position lowers the convertible top and all 4 windows down simultaneously only if held in this position.
- Top Up - Holding the switch in this position raises the convertible top to the closed position. It will also lower all 4 windows approximately 3 inches to prevent seal damage. The windows must then be raised to the full up position by the vehicle operator.