Operation

OPERATION





The Convertible Top operates by integrating both electrical/electronics and hydraulics to form the Power Top Control System. The Power Top Control System is designed to function as a stand alone system.

Electrically, the Power Top Control Module (PTCM) is responsible for monitoring and controlling the functionality of the hydraulic control system. The PTCM monitors various Travel Sensors, and Limit Switches throughout the Power Top Control System to determine hydraulic fluid flow.

Hydraulically, the Power Top Hydraulic Assembly is a self contained unit. The Power Top Hydraulic Assembly includes the motor, pump, and fluid reservoir. The Power Top Hydraulic Assembly operates the various hydraulic cylinders and hydraulic latches that work to raise and lower the convertible top. The Power Top Hydraulic Assembly operates directly from the outputs from the PTCM. The PTCM will activate the Rotational Relays, thereby energizing the Pump Assembly.

UNLOCK REAR BOW (OPEN TOP)





The Power Top Control Module (PTCM) receives battery feed through the Fused B(+) circuit when the ignition switch is in the ON position. The power top Switch is hard wired to the PTCM. The PTCM monitors the power top Switch circuit, and when the switch is pressed to open the convertible top, the PTCM monitors all travel sensor and switches to verify the location and state of the top. When the PTCM senses that the latch retainer switch is open, and the roof open switch is open, the PTCM will energize the Right Rotation Relay and the Hydraulic Solenoid S3. The Power Top Hydraulic Assembly delivers hydraulic fluid to the following areas:

- Hydraulic fluid is delivered through Hydraulic Solenoid S3 to the base side of both main cylinders to stabilize the top while the rear bow latch is unlocked.
- Hydraulic fluid is delivered through Hydraulic Solenoid S3 to the rear bow latch cylinder to unlock the rear bow.

LIFT REAR BOW (OPEN TOP)





When the PTCM senses that the rear bow latch is unlocked by the rear bow switch, the PTCM energizes the Right Rotation Relay and the Hydraulic Solenoids S2 and S3. The Power Top Hydraulic Assembly delivers hydraulic fluid to the following areas:

- Hydraulic fluid is delivered through Hydraulic Solenoid S3 to the base side of the rear bow latch cylinder to keep the rear bow latch cylinder unlocked.
- Hydraulic fluid is delivered through Hydraulic Solenoids S2 and S3 to the rod and base side of the main cylinders to stabilize the top while the rear bow cylinders raise the rear bow.
- Hydraulic fluid is delivered through Hydraulic Solenoid S2 to the rod side of the tonneau cover cylinder to stabilize the cover while the rear bow cylinders raise the rear bow.
- Hydraulic fluid is delivered through Hydraulic Solenoids S3 and S2 to both sides of the proportioning valve. When equal pressure is applied to both sides of the proportioning valve, hydraulic fluid is allowed to travel to the rod side of both rear bow cylinders to raise the rear bow.

UNLOCK AND OPEN TONNEAU COVER (OPEN TOP)





When the PTCM senses that the rear bow is up all the way by the rear bow travel sensor (base side), the PTCM energizes the Right Rotation Relay and the Hydraulic Solenoids S1, S2, and S3. The Power Top Hydraulic Assembly delivers hydraulic fluid to the following areas:

- Hydraulic fluid is delivered through Hydraulic Solenoid S3 to the base side of the rear bow latch cylinder to keep the latch unlocked.
- Hydraulic fluid is delivered through Hydraulic Solenoids S2 and S3 to both sides of the proportioning valve. When equal pressure is applied to both sides of the proportioning valve, hydraulic fluid is allowed to travel to the rod side of both rear bow cylinders to stabilize the rear bow while the tonneau cover opens.
- Hydraulic fluid is delivered through Hydraulic Solenoids S2 and S3 to the rod and base side of both main cylinders to stabilize the top while the tonneau cover opens.
- Hydraulic fluid is delivered through Hydraulic Solenoids S2 and then S1 to the base side of the tonneau cover latch cylinder to unlock the tonneau cover.
- Hydraulic fluid is delivered through Hydraulic Solenoids S2 and then S1 to the rod and base side of the tonneau cover cylinder to raise the tonneau cover. Even though there is hydraulic pressure on both sides of the tonneau cover cylinder, the cylinder slowly moves to open the tonneau cover because there is a greater surface area on the base side of the cylinder than the rod side.

LOWER REAR BOW (OPEN TOP)





When the PTCM senses that the tonneau cover is up all the way by the tonneau cover cylinder travel sensor (rod side), the PTCM energizes the Right Rotation Relay and the Hydraulic Solenoids S1, S3, and S4. The Power Top Hydraulic Assembly delivers hydraulic fluid to the following areas:

- Hydraulic fluid is delivered through Hydraulic Solenoids S3 and S4 to the rod and base side of the rear bow latch cylinder to keep the latch unlocked.
- Hydraulic fluid is delivered through Hydraulic Solenoid S3 to the base side of the main cylinders to stabilize the top while the rear bow moves into the cargo compartment.
- Hydraulic Solenoid S1 is activated and holds the hydraulic fluid in the base of both tonneau cover and latch cylinders to stabilize the tonneau cover while the rear bow is being lowered into the cargo compartment.
- Hydraulic fluid is delivered through Hydraulic Solenoid S4 to the base side of both rear bow cylinders to lower the rear bow into the cargo compartment.

OPENING CONVERTIBLE TOP (OPEN TOP)





When the PTCM senses that the rear bow has been lowered in the cargo compartment by the rear bow cylinder travel sensor (rod side), the PTCM energizes the Right Rotation Relay and the Hydraulic Solenoids S1, and S2. The Power Top Hydraulic Assembly delivers hydraulic fluid to the following areas:

- Hydraulic fluid is delivered through Hydraulic Solenoid S2 and then S1 to the rod and base side of the tonneau cover cylinder and the base side of the tonneau cover latch cylinder to stabilize the tonneau cover and latch cylinder while the main cylinders lower the top into the cargo compartment.
- Hydraulic fluid is delivered through Hydraulic Solenoid S2 to the rod side of both main cylinders to lower the top into the cargo compartment.

CLOSE AND LOCK TONNEAU COVER (OPEN TOP)





When the PTCM senses that the top has been lowered into the cargo compartment by the main cylinder travel sensor (base side), the PTCM energizes the Left Rotation Relay, and the Hydraulic Solenoid S2 is activated to block hydraulic fluid. The Power Top Hydraulic Assembly delivers hydraulic fluid to the following areas:

- Hydraulic fluid is delivered to the rod side of both main cylinders to stabilize the top in the cargo compartment as the tonneau cover is lowered and locked.
- Hydraulic fluid is delivered to the rod side of the tonneau cover cylinder and the tonneau cover latch cylinder to lower and lock down the tonneau cover.

CONVERTIBLE TOP OPEN





When the PTCM senses that the tonneau cover has been lowered and locked by the tonneau cover cylinder travel sensor and the tonneau cover switch, the PTCM sends a signal over the CAN B BUS to the instrument cluster to chime indicating that lowering the convertible top is complete.

UNLOCK AND OPEN TONNEAU COVER (CLOSE)





When the PTCM senses that the power top Switch is pressed to close the top, the PTCM energizes the Right Rotation Relay and the Hydraulic Solenoids S1, and S2. The Power Top Hydraulic Assembly delivers hydraulic fluid to the following areas:

- Hydraulic fluid is delivered through Hydraulic Solenoid S2 to the rod side of both main cylinders to stabilize the top while the tonneau cover unlocks and opens.
- Hydraulic fluid is delivered through Hydraulic Solenoid S2 and then S1 to the base side of the tonneau cover latch cylinder to unlock the tonneau cover.
- Hydraulic fluid is delivered through Hydraulic Solenoid S2 and then S1 to both sides of the tonneau cover cylinder to lift the tonneau cover. Even though there is hydraulic pressure on both sides of the tonneau cover cylinder, the cylinder slowly moves to open the tonneau cover because there is a greater surface area on the base side of the cylinder than the rod side.

CLOSING CONVERTIBLE TOP (CLOSE TOP)





When the PTCM senses that the tonneau cover has been lifted by the tonneau cover travel sensor (rod side), the PTCM energizes the Right Rotation Relay and the Hydraulic Solenoids S1, and S3. The Power Top Hydraulic Assembly delivers hydraulic fluid to the following areas:

- The PTCM actuates Hydraulic Solenoid S1 to stabilize the tonneau cover cylinder and latch cylinder by locking the hydraulic fluid on the base side of the cylinders.
- Hydraulic fluid is delivered through Hydraulic Solenoid S3 to the base side of the rear bow latch cylinder to keep the latch unlocked.
- Hydraulic fluid is delivered through Hydraulic Solenoid S3 to the base side of both main cylinders to raise the top out of the cargo compartment.

LIFT REAR BOW (CLOSE TOP)





When the PTCM senses that the main cylinders have closed the top by the main cylinder travel sensors (rod side), the PTCM energizes the Right Rotation Relay and the Hydraulic Solenoids S2, S3, and S1. The Power Top Hydraulic Assembly delivers hydraulic fluid to the following areas:

- Hydraulic fluid is delivered through Hydraulic Solenoid S3 to the base side of the rear bow latch cylinder to keep the rear bow unlocked.
- Hydraulic fluid is delivered through Hydraulic Solenoids S2 and S3 to both sides of the main cylinders to stabilize the top while the rear bow cylinders raise the rear bow.
- Hydraulic fluid is delivered through Hydraulic Solenoids S2 and then S1 to the rod side and base side of the tonneau cover cylinder and the base side of the tonneau cover latch cylinder to stabilize the cover while the rear bow cylinders raise the rear bow out of the cargo compartment.
- Hydraulic fluid is delivered through Hydraulic Solenoids S3 and S2, which equalizes the pressure on the proportioning valve and allows hydraulic fluid to the rod side of the rear bow cylinders to lift the rear bow.

CLOSE AND LOCK TONNEAU COVER (CLOSE TOP)





When the PTCM senses that the rear bow has been raised out of the cargo compartment by the rear bow travel sensor (base side), the PTCM energizes the Left Rotation Relay and the Hydraulic Solenoids S2 and S3. The Power Top Hydraulic Assembly delivers hydraulic fluid to the following areas:

- Hydraulic Solenoids S2 and S3 are activated to lock hydraulic fluid to both sides of the Main cylinders, the base side of the Rear Bow Latch cylinder, and the rod side of both Rear Bow cylinders to stabilize the top while the tonneau cover is lowered and locked.
- Hydraulic fluid is delivered to the rod side of the tonneau cover cylinder and tonneau cover latch cylinder to lower and lock down the tonneau cover.

LOWER AND LATCH REAR BOW (CLOSE TOP)





When the PTCM senses that the tonneau cover has been lowered and locked down by the tonneau cover travel sensor (base side) and the tonneau cover switch, the PTCM energizes the Right Rotation Relay and the Hydraulic Solenoid S4. The Power Top Hydraulic Assembly delivers hydraulic fluid to the following areas:

- Hydraulic fluid is delivered through Hydraulic Solenoid S4 to the base side of both rear bow cylinders to lower the rear bow onto the tonneau cover.
- Hydraulic fluid is delivered through Hydraulic Solenoid S4 to the rod side of the rear bow latch cylinder to lock down the rear bow.

CONVERTIBLE TOP CLOSED





When the PTCM senses that the rear bow has been lowered and locked by the rear bow travel sensor and the rear bow switch, all hydraulic pressure is released.

CONVERTIBLE TOP NORMAL INPUT/OUTPUT STATUS

The following chart displays normal input/output states during convertible top operation. The chart can be used as a quick reference to diagnose a concern with the convertible top. See figure for component locations.