XLR V8-4.6L VIN A (2006)
diagnose a concern with the top position sensors.
Important:
Performing a relearn procedure on the FTC module will reset all of the reference parameters and the top will usually function again but the root cause of
the concern will not have been fixed.
Important:
Cycling the top system repeatedly will cause the pump motor temperature to rise. If the pump gets too hot the system will suspend operation, send a
"TOP MOTOR OVER TEMP" message to the DIC, and possibly set a DTC. The system can usually be cycled three complete opening and closings
consecutively without overheating the pump motor. Allow at least 10 minutes after a "TOP MOTOR OVER TEMP" is observed before operating the top
again.
The Tech 2 displays four parameters for each panel that uses a potentiometer to establish its position. Here is a definition of each:
^
Status: This describes the FTC module's interpretation of the panel position based on the position feedback from the potentiometer. The value from
the potentiometer must be outside of the learned reference counts for the status to read open/closed or extended/retracted. When the value falls
between the reference counts, the status will read Mid.
^
Position: This is the live feedback value from the potentiometer for the panel position. The FTC module converts the potentiometer's signal voltage
to counts.
^
Open and Closed Reference: This is a calibrated value that the FTC module establishes after every successful cycle of the top. The FTC module will
update this value when the position value goes above or below the last established reference.
Table 1 above shows the relationship of the position counts to the reference counts. As the rear tonneau is opening, the position counts are rising. As the
rear tonneau is closing the position counts are lowering.
For the rear tonneau position to be considered open the position counts have to be equal to or higher than the open reference count. For the rear tonneau
position to be considered closed the position counts have to be equal to or lower than the closed reference count. The front tonneau and top position
sensor work the same way.
When the folding top position sensor is reading retracted it is at the low end of the scale and extended is the high end.
1. Check the system for DTCs. If any DTCs are stored, correct them first before performing the following procedure. Note that a B3670 (Top Motor
Temp Circuit) can be set as a result of repeatedly cycling the top. If this code is stored, clear it and proceed.
2. If the top will not operate, check the DIC for messages while holding the top control switch down. The ignition must be in ACCESSORY or RUN, and
power windows normalized.
3. Use the Tech 2 to view the FTC module inputs. Capture the following panel REFERENCE counts as indicated. The Tech 2 displays four parameters
for each panel that uses a potentiometer to establish it's position. Refer to the definition list above for an explanation of these terms.
