Power Folding Top Inoperative
Power Folding Top Inoperative
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The folding top control (FTC) module receives battery positive voltage on terminal 26 from the FOLDING TOP MAIN POWER fuse. The FTC module also receives battery positive voltage on terminal 24 from the FOLDING TOP LOGIC POWER fuse. Ground is provided to the FTC module through terminal 25 and terminal 27 from G301. The FTC module communicates on the low speed GMLAN serial data circuit using terminal 1 and terminal 2. When Open is selected on the folding top open/close switch, the retractable roof open signal circuit terminal 22 of the FTC module is pulled low. When Close is selected on the folding top open/close switch, the retractable roof close signal circuit terminal 10 of the FTC module is pulled low. It the conditions are correct for folding top operation, the FTC module will command the folding top in the requested direction.
Diagnostic Aids
Before any movement of the top is allowed, the FTC module must be aware of the following conditions:
* The ignition must be in RUN.
* The transmission must be in PARK.
* The pump motor temperature and the outside temperature must be within operating range.
* The decklid, also referred to as a rear compartment lid or a trunk, must be closed.
* The cargo cover, also referred to as a luggage barrier or partition panel, must be installed, prior to opening top.
Reference Information
Schematic Reference
Folding Top Schematics [1][2]Convertible Top
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Power Folding Top Description and Operation Power Folding Top
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool Luggage Barrier in Place parameter. The reading should be Yes.
• If the parameter is No, perform the Luggage Barrier Inoperative test.
2. Perform the Folding Top Inoperative from the Open/Close Switch test.
Circuit/System Testing
Luggage Barrier Inoperative
1. Ignition OFF, disconnect the harness connector at the rear compartment partition position switch (S20).
2. Test for less than 3 ohms of resistance between the ground circuit terminal B and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, install a 3A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Luggage Barrier In Place parameter is Yes.
• 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 rear compartment partition position switch.
Folding Top Inoperative from the Open/Close Switch
1. Ignition OFF, disconnect the folding top open/close switch.
2. Test for less than 2 ohms of resistance between the ground circuit terminal B and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Top Control Switch parameter is Idle.
• If the parameter is Opening, test the signal circuit terminal C for a short to ground.
• If the parameter is Closing, test the signal circuit terminal A for a short to ground.
4. Install a 3A fused jumper wire between the signal circuit terminal C and ground. Verify the scan tool Top Control Switch parameter is Opening.
• If the parameter is Idle, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the FTC module.
5. Install a 3A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Top Control Switch parameter is Closing.
• If the parameter is Idle, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the FTC module.
6. If all circuits test normal, test or replace the folding top open/close switch.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Folding Top Control Module Replacement Service and Repair
* Folding Top Switch Replacement Folding Top Switch Replacement
* Rear Compartment Side Trim Replacement - Right Side (Convertible) Rear Compartment Side Trim Replacement - Right Side (Convertible)Rear Compartment Side Trim Replacement - Right Side (Coupe/Sedan) Rear Compartment Side Trim Replacement - Right Side (Coupe/Sedan)