The sunroof has 2 modes, or ranges, of operation.
The modes permit the following functions:
| • | The sunroof slides open and closed. |
| • | The rear of the sunroof raises and lowers from the vent position. |
The sunroof module permits transition between these operating ranges.
Transition does not require operator action.
The sunroof control switch controls sunroof travel. The switch is a
single two-pole rocker switch. The switch is located at the overhead console.
The switch provides the following grounded inputs:
| | When the forward portion of the rocker switch is depressed, the open
sunroof slides toward the closed, or flush, position. |
| | Motion stops when the rocker switch is released or when the sunroof
reaches the flush position. |
| | If the forward portion of the rocker switch is held down or is depressed
again, the sunroof raises from the flush position to the vent position. The
motion stops when the rocker switch is released or when the sunroof reaches
the soft-top position in the vent direction. |
| | When the rearward portion of the sunroof control switch is depressed,
the sunroof lowers toward the flush position. |
| | Motion stops when the rocker switch is released or when the sunroof
reaches the flush position |
| | If the rearward portion of the rocker switch is held down or is depressed
again, the sunroof moves in the mode to the open position. The motion stops
when the sunroof reaches the soft-top position in the open direction. |
The sunroof is operated by a bi-directional motor. The motor drives
the sunroof to slide closed and raises the sunroof to the vent position when
the following actions occur:
| • | Voltage is applied to one terminal of the motor. |
| • | Ground is applied to the other terminal of the motor. |
The sunroof lowers from the vent position slides open when voltage is
applied to the other terminal. The motor is equipped with a manual drive capability.
A hex head wrench inserted at the center of the motor may be used to drive
the sunroof through its whole range of travel. Mechanical stops are provided
in the following positions:
The sunroof position is sensed by the sunroof module from a position
encoding system located in the sunroof motor and drive assembly. The encoding
system is represented by the following 3 limit switches:
The limit switches provide a grounded input to the sunroof module. You
may test the input conditions by monitoring the contacts status while manually
driving the sunroof through its full range of travel.
The LS1 contacts open in order to provide a 5V (ungrounded) input
when the sunroof reaches or moves past the vent soft-stop position. This input
initiates the soft-stop in the vent direction and prevents contact with the
vent mechanical stop.
| • | Initiates the soft-stop in the vent direction |
| • | Prevents contact with the vent mechanical stop |
The contacts close in order to provide a grounded input when the lowering
sunroof passes the vent soft-stop position. The input remains grounded through
the flush position and into the opening range. When the opening sunroof
reaches a nearly full-open position, the LS1 contacts open again in order
to provide a 5V (ungrounded) input. This input initiates the soft-stop
in the opening direction.
The LS2 contacts are closed in the vent position. The LS2 contacts open
in order to provide an ungrounded input when the lowering sunroof reaches
the flush position. The input stops travel at the flush position when
the sunroof lowers. The LS2 contacts remain open while the sunroof slides
open until the sunroof reaches the open soft-stop position. The contacts
close again in order to provide the grounded input. This input is used
in conjunction with the LS1 input. The input defines the end-of-travel
soft-stop position in the open direction.
The LS3 provides an operating range input to the module. The LS3 contacts
are closed (grounded input) when the sunroof operates in the slide range.
The LS3 contacts open when the sunroof is in the vent range. The state
of logic selects the end-of-travel input from the other switches. The LS3
contacts opening as the sunroof slides to the flush position is used in
order to stop the sunroof at the flush position.
The sunroof module is equipped with a timer circuit which stops the
operation of the sunroof motor after 8.4 seconds. The timer begins
counting time when one of the following contacts is closed:
| • | The open and down switch contact |
| • | The close and tilt-up switch contact |
The sunroof operates until both the control switch contacts are open
or until 8.4 seconds has elapsed. The timer is automatically reset
when the switch is released and both control switch contacts are open.
The sunroof motor is protected by a built-in electronic
circuit breaker (ECB). If the motor is overloaded or voltage is applied for
an excessive amount of time, the ECB internal resistance increases. This action
creates an open circuit. The resistance returns to normal only after voltage
is removed from the circuit. This action restores the circuit continuity.
