Retractable Roof Initialization Procedure

RETRACTABLE ROOF INITIALIZATION PROCEDURE

DISCUSSION

The following initialization procedure allows the Power Top Control Module (PTCM) (also known as the Sky Slider Electronic Control Unit/ECU or SUNR module) to learn the front and rear open, close and vent stop limits for the retractable roof mechanism. However, in order to ensure optimal results from this initialization procedure, the PTCM is programmed to allow the initialization routine to occur only if certain critical vehicle conditions exist and are maintained.

One condition the PTCM monitors is the system voltage of the vehicle. The system voltage of the vehicle is monitored by the PTCM through electronic messages received over the Controller Area Network (CAN) data bus. If the monitored system voltage is not between about 11 volts and 15 volts, the PTCM will not allow the initialization routine to begin. In addition, if system voltage levels fall outside these parameters during the initialization routine, the PTCM may send a reject code to the diagnostic scan tool and abort the routine.

A second condition monitored by the PTCM is ambient temperature. The ambient temperature is monitored by the PTCM through electronic messages received over the CAN data bus. If the average ambient temperature is not between 5°C (41°F) and 45°C (113°F), the PTCM will not allow the initialization routine to begin. Keep in mind that these ambient temperature values are based upon the same CAN bus messages that are used by the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) to display the ambient temperature in the Electronic Vehicle Information Center (EVIC).

In addition, because the ambient temperature sensor is located in near proximity to the radiator, the Totally Integrated Power Module (TIPM) is programmed to apply a hysteresis to the sensor input values, which is reflected in the electronic ambient temperature sensor messages placed on the CAN bus by the TIPM. This hysteresis is intended to dampen fluctuations in the temperature being displayed and to compensate for the conditions under which the vehicle is being operated, such as extended idling or moving out of (or into) a heated garage. In the final analysis, the average ambient temperature that the PTCM senses is the same ambient temperature being displayed in the EVIC, which may not be the same ambient temperature monitored through any external meter.

PROCEDURE

1. Be certain the ignition switch is in the ON position and the engine is running. This will help to ensure that system voltage is maintained through completion of the procedure.
2. If the retractable roof is in a position other than fully closed, depress the roof switch center button for less than one second and wait for the roof to close.
3. With the roof fully closed, depress and hold the roof switch center button for more than 20 seconds and do not release it until all of the following roof cycles have completed:
- Front of roof will close, then stall
- Rear of roof will close, then stall
- Rear of roof will open
- Rear of roof will close
- Rear of roof will vent (open about five centimeters or two inches)
- Front of roof will open
- Front of roof will close
- Rear of roof closes from vent

4. Once all roof movement has ceased, release the roof switch center button.
5. The retractable roof initialization procedure is now complete.