Power Folding Top Does Not Open
Power Folding Top Does Not Open
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The power folding top system uses seven different position or limit switches and three position sensors that provide input information to the FTC module. The FTC module uses this input information to determine the state and position of the folding top components. Then based on this input, the module then applies battery voltage to the appropriate control circuits to the folding top pump motor and the appropriate valves in order to control the hydraulic system used to operate the folding top.
Diagnostic Aids
* Complete the check list, prior to performing the diagnosis:
- When the folding top control switch is pressed, check for driver information center (DIC) warning messages.
- Windows are normalized. Refer to Power Window Reinitialization (Programming and Relearning) .
- Luggage barrier is installed and secured, closing the luggage barrier switch.
- Vehicle is in PARK.
- Press the ignition to ACCY or RUN, with the engine OFF.
- Hydraulic fluid bypass valve in the operating position, turned clockwise, located above the pump motor.
- Operating temperature is normal.
* Whenever the open/close control switch is released or the top becomes inoperative in a suspended state, pressure will be maintained in the hydraulic system to avoid drifting and damage of components. After 4 minutes, the FTC module will gradually release the hydraulic pressure allowing the top to gradually settle to a resting position.
* When using the scan tool, the Rear Compartment Lid is referenced as the Deck Lid.
* If a repair is made to a signal circuit for a short to ground, test the component of that circuit for proper operation.
* Using the scan tool to access the History parameters for the folding top control (FTC) module, will display the last status of the items listed.
Reference Information
Schematic Reference
Folding Top Schematics ([1][2]Convertible Top)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Power Folding Top Description and Operation (Power Folding Top Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for Scan Tool Information
Circuit/System Verification
Important: This procedure validates the top opening sequence form the top closed position only. Press and hold the folding top open switch until the top open operation stops or the opening procedure is completed as follows:
1. Ignition ON, press and continue to hold the folding top open control switch. The events listed below should simultaneously occur.
* The rear compartment lid should unlatch.
* The front tonneau should open
* The header latch should unlatch
• If the rear compartment did not unlatch, refer to Trunk Release Inoperative (Trunk Release Inoperative) .
• If the front tonneau did not open and the header did not unlatch, refer to the Valve Test and test valve 5.
2. After the front tonneau opens, the scan tool Front Tonneau Status parameter should be Tonneau Open.
• If not the specified value, refer to the Front Tonneau Position Sensor Test.
3. With the header unlatched, the scan tool Header Latch Limit Switches parameter should be Unlatched.
• If not the specified value, refer to the Header Unlatch Limit Switch Test.
4. The rear compartment lid should rise to the open position.
• If the rear compartment lid did not rise to the open position, refer to Power Folding Top Inoperative (Power Folding Top Inoperative)
5. With the rear compartment lid in the full open position, the scan tool Deck Lid Extended parameter should be Active.
• If not the specified value, refer to the Rear Compartment Lid Open Switch Test.
6. The folding top should move down to the stowed/open position.
• If the folding top did not move to the stowed position, refer to the Valve Test and test valve 1.
7. After the rear tonneau extends to the closed position, the scan tool Rear Tonneau Status parameter should be Tonneau Closed.
• If not the specified value, refer to the Rear Tonneau Position Sensor Test.
8. With the folding top in the stowed position, the scan tool Folding Top Status parameter should be Retracted.
• If not the specified value, refer to the Folding Top Position Sensor Test.
9. The front tonneau should close.
• If the front tonneau does not close, refer to the Valve Test and test valve 3.
10. With the front tonneau in the closed position, the scan tool Front Tonneau Status parameter should be Tonneau Closed.
• If not the specified value, refer to the Front Tonneau Position Sensor Test.
11. The header latch should latch and the scan tool Header Latch Limit Switches parameter should be Latched.
• If not the specified value, refer to the Header Latched Switch Test.
12. After the rear compartment lid closes, the scan tool parameters listed below should be Deck Closed.
* Deck Lid Ajar Status
* Deck Lid Latch Switch
• If not the specified values, refer to Trunk Release Inoperative (Trunk Release Inoperative) .
Circuit/System Testing
Valve Test
1. Ignition OFF, disconnect the harness connector at the appropriate valve.
2. Verify that a test lamp illuminates between the ground circuit terminal 2 and B+.
• If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal 1 and ground.
4. Ignition ON, command the Valve ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the folding top control module.
5. If all circuits test normal, test or replace the folding top pump, motor and valve assembly.
Front Tonneau Position Sensor Test
1. With the front tonneau in the full open position, verify that the scan tool Front Tonneau Position Sensor value is at or slightly greater than the Front Tonneau Open Reference Position value.
• If not the specified range, test or replace the front tonneau position sensor.
2. With the front tonneau in the full closed position, verify that the Front Tonneau Position Sensor value is at or slightly less than the Front Tonneau Closed Reference Position value.
• If not the specified range, test or replace the front tonneau position sensor.
3. If the scan tool readings are normal, replace FTC module.
Folding Top Position Sensor Test
1. With the folding top in the stowed/open position, verify that the Folding Top Position Sensor value is at or slightly less than the Top Open Reference Position value.
• If not the specified range, test or replace the folding top position sensor.
2. If the scan tool reading is normal, replace FTC module.
Rear Tonneau Position Sensor Test
1. With the rear tonneau in the extended/closed position, verify that the Rear Tonneau Position Sensor value is at or slightly less than the Rear Tonneau Closed Reference Position Value.
• If not the specified range, test or replace the rear tonneau position sensor.
2. If the scan tool reading is normal, replace FTC module.
Rear Compartment Lid Open Switch Test
1. Ignition OFF, disconnect the harness connector at the rear compartment lid open switch.
2. Ignition ON, verify that a test lamp illuminates between the control circuit terminal B and ground.
• If the test lamp does not illuminate, test the control circuit for short to ground or an open/high resistance.
3. Verify the scan tool Deck Lid Extended parameter is Inactive.
• If not the specified value, test the signal circuit terminal A for a short to voltage. If the circuit tests normal, replace the FTC module.
4. Install a 3A fused jumper wire between the signal circuit terminal A and the control circuit terminal B. Verify the scan tool Deck Lid Extended parameter is Active.
• If not the specified value, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the FTC module.
5. If all circuits test normal, test or replace the rear compartment lid open switch.
Header Unlatch Switch Test
1. Ignition OFF, disconnect the harness connector at the header unlatched switch.
2. Ignition ON, verify that a test lamp illuminates between the control circuit terminal B and ground.
• If the test lamp does not illuminate, test the control circuit for an open/high resistance.
3. Install a 3A fused jumper wire between the signal circuit terminal A and the control circuit terminal B. Verify the scan tool Header Latch Limit Switches parameter is Unlatched.
• If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the FTC module.
4. If all circuits test normal, test or replace the header unlatched switch.
Header Latched Switch Test
1. Ignition OFF, disconnect the harness connector at the header latched switch.
2. Ignition ON, verify that a test lamp illuminates between the control circuit terminal B and ground.
• If the test lamp does not illuminate, test the control circuit for an open/high resistance.
3. Install a 3A fused jumper wire between the signal circuit terminal A and the control circuit terminal B. Verify the scan tool Header Latch Limit Switches parameter is Unlatched.
• If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the FTC module.
4. If all circuits test normal, test or replace the header latched switch.
Component Testing
Header Latch Switch, Header Unlatched Switch, or Top Closed Switch
1. Ignition OFF, disconnect the harness connector at the appropriate switch.
2. Test for infinite resistance between the signal terminal and the control terminal with the switch in the open position.
• If not the specified value, replace the switch.
3. Test for less than 1 ohm between the signal terminal and the control terminal with the switch in the closed position.
• If not the specified value, replace the switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Important: Perform the Power Folding Top Learn (Programming and Relearning) after component replacement.
* Folding Top Pump with Motor Replacement (Service and Repair)
* Folding Top Position Switch Replacement (Service and Repair)
* Folding Top Stowage Compartment Front Closeout Panel Position Switch Replacement (Folding Top Stowage Compartment Front Closeout Panel Position Switch Replacement)
* Folding Top Stowage Compartment Rear Panel Position Switch Replacement (Folding Top Stowage Compartment Rear Panel Position Switch Replacement)
* Folding Top Front Latch Position Sensor Switch Replacement (Service and Repair)
* Folding Top Front Latch Replacement (Folding Top Front Latch Replacement)
* Folding Top Front Locating Pin Position Switch Replacement (Folding Top Front Locating Pin Position Switch Replacement)
* Control Module References (Programming and Relearning) for FTC module and BCM replacement, setup, and programming