Diagnostic Instructions
| • | Perform the Diagnostic Starting Point - Roof prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Folding Top Control Module Battery Voltage | 1 | 1 | -- | -- |
Folding Top Control Module Control | B1420 | B1420 | -- | -- |
Folding Top Control Module Ground | -- | 1, 2 | -- | -- |
Folding Top Switch Battery Voltage | 2 | 2 | -- | -- |
Folding Top Control Switch Close Signal | 2 | 2 | B3602 | -- |
Folding Top Control Switch Open Signal | 2 | 2 | B3602 | -- |
Front Tonneau Position Sensor 5-Volt Reference | B3665, B3666, B3971 | B3665 | B3665, B3666, B3670, B3971 | -- |
Front Tonneau Position Sensor Signal | B3665 | B3665 | B3665 | -- |
Front Tonneau Position Sensor Low Reference | -- | B3665 | -- | -- |
Folding Top Position Sensor 5-Volt Reference | B3665, B3666, B3971 | B3971 | B3665, B3666, B3670, B3971 | -- |
Folding Top Position Sensor Signal | B3971 | B3971 | B3971 | -- |
Folding Top Position Sensor Low Reference | -- | B3971 | -- | -- |
Rear Tonneau Position Sensor 5-Volt Reference | B3665, B3666, B3971 | B3666 | B3665, B3666, B3670, B3971 | -- |
Rear Tonneau Position Sensor Signal | B3666 | B3666 | B3666 | -- |
Rear Tonneau Position Sensor Low Reference | -- | B3666 | -- | -- |
Folding Top Pump Motor Thermal Sensor 5-Volt Reference | B3665, B3666, B3971 | 2, 7 | B3665, B3666, B3971, B3670 | -- |
Folding Top Pump Motor Thermal Sensor Signal | 2, 7 | 2, 7 | B3670 | -- |
Hard Top Connected Signal | B1420 | 4, 7 | B1310 | -- |
Folding Top Closed Switch Control | B1420 | 4, 7 | -- | -- |
Header Latched Switch Signal | B1420, 3, 4, 7 | 3, 4, 7 | B1300 | -- |
Header Latched Switch Control | B1420 | 3, 4, 7 | -- | -- |
Header Unlatched Switch Signal | B1420, 9 | 9 | B1300 | -- |
Header Unlatched Switch Control | B1420 | 9 | -- | -- |
Luggage Barrier Switch Signal | B1420, 2, 7 | 2, 7 | 8 | -- |
Luggage Barrier Switch Control | B1420 | 2, 7 | -- | -- |
Pump Direction A Control | B1011 | 2 | -- | -- |
Pump Direction B Control | B1011 | 2 | -- | -- |
Rear Compartment Lid Open Switch Signal | B1420, 3, 4 | 3, 4 | B3669 | -- |
Rear Compartment Lid Open Switch Control | B1420 | 3, 4 | -- | -- |
Valve 1 Control | 1 | 3 | -- | -- |
Valve 1 - Ground | -- | 3 | -- | -- |
Valve 2 Control | 1 | 4 | -- | -- |
Valve 2 - Ground | -- | 4 | -- | -- |
Valve 3 Control | 1 | 3, 4, 6 | -- | -- |
Valve 3 - Ground | -- | 3, 4, 6 | -- | -- |
Valve 4 Control | 1 | B1297, 3, 4, 5 | -- | -- |
Valve 4 - Ground | -- | B1297, 3, 4, 5 | -- | -- |
Valve 5 Control | 1 | 2 | -- | -- |
Valve 5 - Ground | -- | 2 | -- | -- |
1. No communication with the folding top control module 2. Power folding top is inoperative 3. Power folding top does not open or complete the top opening procedure 4. Power folding top does not close or complete the top closing procedure 5. Rear Compartment lid will not open 6. Rear compartment lid will not close 7. DIC warning message displayed 8. Folding top will operate with the luggage barrier removed 9. No effect on power folding top operation | ||||
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 folding top control (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. |
| - | 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 folding top 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
Connector End View Reference
Power Roof Systems Connector End Views
Description and Operation
Power Folding Top Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References 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:
- Ignition ON, press and continue to hold the folding top open control switch. The events listed below should simultaneously occur.
- After the front tonneau opens, the scan tool Front Tonneau Status parameter should be Tonneau Open.
- With the header unlatched, the scan tool Header Latch Limit Switches parameter should be Unlatched.
- The rear compartment lid should rise to the open position.
- With the rear compartment lid in the full open position, the scan tool Deck Lid Extended parameter should be Active.
- The folding top should move down to the stowed/open position.
- After the rear tonneau extends to the closed position, the scan tool Rear Tonneau Status parameter should be Tonneau Closed.
- With the folding top in the stowed position, the scan tool Folding Top Status parameter should be Retracted.
- The front tonneau should close.
- With the front tonneau in the closed position, the scan tool Front Tonneau Status parameter should be Tonneau Closed.
- The header latch should latch and the scan tool Header Latch Limit Switches parameter should be Latched.
- After the rear compartment lid closes, the scan tool parameters listed below should be Deck Closed.
| • | 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. |
| ⇒ | If the front tonneau did not open and the header did not unlatch, refer to the Valve Test and test valve 5. |
| ⇒ | If not the specified value, refer to the Front Tonneau Position Sensor Test. |
| ⇒ | If not the specified value, refer to the Header Unlatched Switch Test. |
| ⇒ | If the rear compartment lid did not rise to the open position, refer to Power Folding Top Inoperative. |
| ⇒ | If not the specified value, refer to the Rear Compartment Lid Open Switch Test. |
| ⇒ | If the folding top did not move to the stowed position, refer to the Valve Test and test valve 1. |
| ⇒ | If not the specified value, refer to the Rear Tonneau Position Sensor Test. |
| ⇒ | If not the specified value, refer to the Folding Top Position Sensor Test. |
| ⇒ | If the front tonneau does not close, refer to the Valve Test and test valve 3. |
| ⇒ | If not the specified value, refer to the Front Tonneau Position Sensor Test. |
| ⇒ | If not the specified value, refer to the Header Latched Switch Test. |
| • | Deck Lid Ajar Status |
| • | Deck Lid Latch Switch |
| ⇒ | If not the specified values, refer to Trunk Release Inoperative. |
Circuit/System Testing
Valve Test
- Ignition OFF, disconnect the harness connector at the appropriate valve.
- Verify that a test lamp illuminates between the ground circuit terminal 2 and B+.
- Connect a test lamp between the control circuit terminal 1 and ground.
- 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 all circuits test normal, test or replace the pump and valve assembly.
| ⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
| ⇒ | 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. |
Front Tonneau Position Sensor Test
- 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.
- 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 Close Reference Position value.
- If the scan tool readings are normal, replace folding top module.
| ⇒ | If not the specified range, test or replace the front tonneau position sensor. |
| ⇒ | If not the specified range, test or replace the front tonneau position sensor. |
Folding Top Position Sensor Test
- With the folding top in the stowed/open position, verify that the Folding Top Position Sensor value is at or slightly less than the Folding Top Open Reference Position value.
- If the scan tool reading is normal, replace folding top module.
| ⇒ | If not the specified range, test or replace the folding top position sensor. |
Rear Tonneau Position Sensor Test
- 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 Close Reference Position Value.
- If the scan tool reading is normal, replace folding top module.
| ⇒ | If not the specified range, test or replace the rear tonneau position sensor. |
Rear Compartment Lid Open Switch Test
- Ignition OFF, disconnect the harness connector at the rear compartment lid open switch.
- Ignition ON, verify that a test lamp illuminates between the control circuit terminal B and ground.
- Verify the scan tool Deck Lid Extended parameter is Inactive.
- 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 all circuits test normal, test or replace the rear compartment lid open switch.
| ⇒ | If the test lamp does not illuminate, test the control circuit for short to ground or an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal A for a short to voltage. If the circuit tests normal, replace the folding top module. |
| ⇒ | 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 folding top module. |
Header Unlatched Switch Test
- Ignition OFF, disconnect the harness connector at the header unlatched switch.
- Ignition ON, verify that a test lamp illuminates between the control circuit terminal B and ground.
- 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 all circuits test normal, test or replace the header unlatched switch.
| ⇒ | If the test lamp does not illuminate, test the control circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the folding top module. |
Header Latched Switch Test
- Ignition OFF, disconnect the harness connector at the header latched switch.
- Ignition ON, verify that a test lamp illuminates between the control circuit terminal B and ground.
- 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 all circuits test normal, test or replace the header latched switch.
| ⇒ | If the test lamp does not illuminate, test the control circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the folding top module. |
Component Testing
Header Latched Switch, Header Unlatched Switch, or Folding Top Closed Switch
- Ignition OFF, disconnect the harness connector at the appropriate switch.
- Test for infinite resistance between the signal terminal and the control terminal with the switch in the open position.
- 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. |
| ⇒ | If not the specified value, replace the switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Important: Perform the Power Folding Top Learn after component replacement.
| • | Control Module References for folding top module and BCM replacement, setup, and programming |
