GM Service Manual Online
For 1990-2009 cars only

Roof

Battery Voltage Signal: The scan tool displays 9.0-16.0 Volts. The state of the voltage feed to the folding top module.

Deck Lid Ajar Status: This parameter is in multiple data lists. History Roof/Trunk: The scan tool displays Known / Unknown. The class 2 message from the trunk latch module, what the status was as the folding top control switch was released. Inputs: The scan tool displays Deck Closed / Deck Ajar. A class 2 message from the trunk latch module, what the status is of the decklid.

Deck Lid Closed Switch: The scan tool displays Active / Inactive. The decklid close switch input to the FTC module, where the transitions are displayed as Active when switch is pressed or Inactive when switch is idle.

Deck Lid Extended: The scan tool displays Active / Inactive. The decklid open switch input to the FTC module, when the decklid extends fully upward will display Active. Decklid in any other position is displayed as Inactive.

Deck Lid Latch Status: This parameter is in multiple data lists. History Roof/Trunk: The scan tool displays Cleared / Not Cleared. The decklid latch input to the FTC module, where the decklid striker was compared to the trunk latch, when the folding top control switch was released. Inputs: The scan tool displays Cleared / Not Cleared. The decklid latch input to the FTC module, when the decklid striker is cleared from the latch, will display Cleared.

Driver Window Operation: The scan tool displays Enabled / Disabled. Window operation will become Disabled while the folding top system is operating. Window operation will be Enabled when the folding top system is not operating. The status of the driver window operation is displayed once the folding top control switch is released.

Driver Window Position Status: The scan tool displays OK / Out of Limit. The status of the window position is displayed once the folding top control switch is released.

Folding Top Calibrated: The scan tool displays Yes / No. The potentiometer position sensor need to be learned, calibrating the folding top system. The status is displayed once the folding top control switch is released.

Folding Top Close Reference Position: The scan tool displays between 0-255 Counts. The extended/closed soft limit calibration of the position sensor is displayed in Counts.

Folding Top Open Reference Position: The scan tool displays between 0-255 Counts. The retracted/stowed/open soft limit calibration of the position sensor displayed in Counts.

Folding Top Position Sensor: The scan tool displays between 0-255 Counts. The current position of the folding top is displayed in Counts. The movement of the top will vary the counts in relation to the Folding Top Open and Close Reference Position counts. As the top, position sensor, reaches a reference position, the top will continue to move outside the reference position to secure the top, by driving the linkage over-center.

Folding Top Status: The scan tool displays Extended / Mid / Retracted / Invalid. The current position of the folding top, displayed as Extended / Mid / Retracted / Invalid.

Front Tonneau Status: The scan tool displays Open / Mid / Tonneau Closed / Invalid. The current position of the front tonneau, displayed as Extended, Mid, Retracted / Invalid.

Front Tonneau Close Reference Position: The scan tool displays Counts. The retracted or closed soft limit calibration of the front tonneau, displayed in Counts.

Front Tonneau Open Reference Position: The scan tool displays Counts. The extended or open soft limit calibration of the front tonneau, displayed in Counts.

Front Tonneau Position Sensor: The scan tool displays between 0-255 Counts. The current position of the front tonneau is displayed in Counts. The movement of the tonneau will vary the counts in relation to the Front Tonneau Open and Close Reference Position counts. As the tonneau, position sensor, reaches a reference position, the tonneau will continue to move outside the reference position to secure the tonneau, by driving the linkage over-center.

Header Latch Limit Switches: The scan tool displays Latched / Mid / Unlatched / Invalid. The current position of the header latch status is displayed based on the combination inputs to the FTC module, as it compares the header latched and unlatched signals.

Limit Switch Supply Voltage: The scan tool displays Present / Not Present. The limit switch supply voltage to the FTC module, where the status is displayed as Present / Not Present, once the folding top control switch is released.

Luggage Barrier In Place: The scan tool displays Yes / No. The luggage barrier limit, or cargo cover, switch input to the FTC module, where the status is displayed as Yes with the barrier in place, once the folding top control switch is released.

Luggage Barrier Limit Switch: The scan tool displays Open / Closed. The cargo cover when installed closes the luggage barrier limit switch and signals an input to the FTC module, where the status is displayed as Closed. The cargo cover that is not installed will display an Open.

Motor Feedback: The scan tool displays amps. Where the folding top movement is measured in amps. There may be times, as the decklid is lowering to close, that the amperage reading may display 0.00. This value of the parameter does not display the correct value, even though the decklid is operating.

Motor Feedback Current: The scan tool displays OK / High. The motor current status of the FTC module, where the status is displayed as OK / High.

Motor X Direction Command: The scan tool displays On / Off. The motor output, X direction, from the FTC module, where the movement is displayed as On / Off.

Motor Y Direction Command: The scan tool displays On / Off. The motor output, Y direction, from the FTC module, where the movement is displayed as On / Off.

Passenger Window Operation: The scan tool displays Enabled / Disabled. Window operation will become Disabled while the folding top system is operating. Window operation will be Enabled when the folding top system is not operating. The status of the driver window operation is displayed once the folding top control switch is released.

Passenger Window Position Status: The scan tool displays OK / Out of Limit. The status of the window position is displayed once the folding top control switch is released.

Position Sensor Status: The scan tool displays OK / Error. The sensor inputs to the FTC module, where the combined status of all the sensors, will be displayed as OK or Error, once the folding top control switch is released.

Power Mode Active: The scan tool displays Yes / No. The class 2 message as to the Power Mode status, when it is either in Accessory or RUN, is displayed once the folding top control switch is released.

Pump Motor Temp Sensor: The scan tool displays The temperature of the pump motor thermistor is displayed as Fahrenheit / Celsius.

Pump Over Temperature Sensor: The scan tool displays Over Temp / Normal. The pump motor thermistor input to the FTC module, when the temperature is outside of the normal operating range, displayed as Over Temp.

Rear Tonneau Close Reference Position: The scan tool displays Counts. The extended or closed soft limit calibration of the rear tonneau, displayed in Counts.

Rear Tonneau Open Reference Position: The scan tool displays Counts. The retracted or open soft limit calibration of the rear tonneau, displayed in Counts.

Rear Tonneau Position Sensor: The scan tool displays between 0-255 Counts. The current position of the rear tonneau is displayed in Counts. The movement of the tonneau will vary the counts in relation to the Rear Tonneau Open and Close Reference Position counts. As the tonneau, position sensor, reaches a reference position, the tonneau will continue to move outside the reference position to secure the tonneau, by driving the linkage over-center.

Rear Tonneau Status: The scan tool displays Invalid / Tonneau Open / Mid / Tonneau Closed. The current position of the rear tonneau, displayed as Extended, Mid or Retracted.

System Timer: The scan tool displays OK / Expired. When the folding top operation sequence takes too long, Expired will be displayed, once the folding top control switch is released.

System Voltage: The scan tool displays OK / Low. The scan tool displays OK / Low, when based on the state of the voltage supply to the folding top module.

Too Cold For Top Operation: The scan tool displays Yes / No. The pump motor thermistor input to the FTC module, when the temperature is too cold, will display Yes, once the folding top control switch is released.

Top Closed Limit Switch: The scan tool displays Active / Inactive. The top closed limit switch input signals the FTC module, when the folding top dowel pin is seated inside the dowel pin receiver on the header, displaying Active. The folding top in any other position is displayed as Inactive.

Top Control: The scan tool displays Inhibited / Enabled. The folding top control switch input to the FTC module, as the decklid operation has started, then the top control switch will display as Inhibited.

Top Control Switch : The scan tool displays Idle / Top Open / Top Closed / Invalid. The FTC module monitors the top control switch open signal and close signal inputs, comparing the inputs and displaying the status as Top Open, Top Closed, Idle or Invalid.

Trunk Control: The scan tool displays Inhibited / Enabled. Once the folding top operation has started, the decklid control switches will become Inhibited, until the top has completed the operation.

Valet Status: The scan tool displays Active / Inactive. The status of the valet switch, displayed as Active, inhibits the folding top and deck lid operation.

Valet Switch Status: The scan tool displays Active / Inactive. The status of the valet switch is displayed once the folding top control switch is released.

Valve 1 Command: The scan tool displays On / Off. The valve control output from the FTC module, where the valve request is displayed as On or Off. The display will vary between On and Off based on the sequence of operation. If the folding top is suspended, not having completed an open or closing cycle and the folding top open/close control switch is released, the valve will be On. 4 minutes later hydraulic pressure will be released by cycling the valves Off and On, allowing the top to gradually settle to a resting position.

Valve 2 Command: The scan tool displays On / Off. The valve control output from the FTC module, where the valve request is displayed as On or Off. The display will vary between On and Off based on the sequence of operation. If the folding top is suspended, not having completed an open or closing cycle and the folding top open/close control switch is released, the valve will be On. 4 minutes later hydraulic pressure will be released by cycling the valves Off and On, allowing the top to gradually settle to a resting position.

Valve 3 Command: The scan tool displays On / Off. The valve control output from the FTC module, where the valve request is displayed as On or Off. The display will vary between On and Off based on the sequence of operation. If the folding top is suspended, not having completed an open or closing cycle and the folding top open/close control switch is released, the valve will be On. 4 minutes later hydraulic pressure will be released by cycling the valves Off and On, allowing the top to gradually settle to a resting position.

Valve 4 Command: The scan tool displays On / Off. The valve control output from the FTC module, where the valve request is displayed as On or Off. The display will vary between On and Off based on the sequence of operation. If the folding top is suspended, not having completed an open or closing cycle and the folding top open/close control switch is released, the valve will be On. 4 minutes later hydraulic pressure will be released by cycling the valves Off and On, allowing the top to gradually settle to a resting position.

Valve 5 Command: The scan tool displays On / Off. The valve control output from the FTC module, where the valve request is displayed as On or Off. The display will vary between On and Off based on the sequence of operation. If the folding top is suspended, not having completed an open or closing cycle and the folding top open/close control switch is released, the valve will be On. 4 minutes later hydraulic pressure will be released by cycling the valves Off and On, allowing the top to gradually settle to a resting position.

Vehicle in PARK: The scan tool displays Yes / No. The status of the vehicle if it is in PARK, where the status is displayed as Yes / No.

HVAC

Valet Switch: The scan tool displays Active/Inactive. This is the current state of the valet switch.

Driver Door Module (DDM)

Battery Voltage Signal: The scan tool displays 9.0-16.0 Volts. The state of the voltage feed to the module.

Window Normalization: The scan tool displays Yes / No. The driver window motor normalization state, as seen by the DDM.

Passenger Door Module (PDM)

Battery Voltage Signal: The scan tool displays 9.0-16.0 Volts. The state of the voltage feed to the module.

Window Normalization: The scan tool displays Yes / No. The passenger window motor normalization state, as seen by the PDM.