Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+, FTC module X1 terminal 24 | 1 | 1 | -- | -- |
B+, FTC module X1 terminal 26 | B1335 03, B3860 02 | B1335 03 | -- | -- |
12-volt reference | B1395 02 | B1296 06, B3669 06 | -- | -- |
Serial data, FTC module X1 terminal 1 | 1 | -- | 1 | -- |
Serial data, FTC module X1 terminal 2 | 1 | -- | 1 | -- |
Serial data, FTC module X1 terminal 11 | B316A 02 | 2 | B316A 01 | -- |
Serial data, FTC module X1 terminal 23 | B316A 02 | 3 | B316A 01 | -- |
Signal, FTC module X1 terminal 4 | B3685 59, B1010 08 | B3685 59 | -- | -- |
Signal, FTC module X1 terminal 5 | 4 | 4 | -- | -- |
Signal, FTC module X1 terminal 10 | B3602 02 | 4 | -- | -- |
Signal, FTC module X1 terminal 16 | B3683 59, B1010 08 | B3683 59, B1010 08 | -- | -- |
Signal, FTC module X1 terminal 17 | B366C 59 | B1010 08 | -- | -- |
Signal, FTC module X1 terminal 22 | B3602 02 | 4 | -- | -- |
Signal, FTC module X2 terminal 7 | B366D 59 | B366D 59 | -- | -- |
Signal, FTC module X2 terminal 8 | B366A 59 | B366A 59 | -- | -- |
Signal, FTC module X2 terminal 11 | B3669 06 | B3669 06 | B3669 01 | -- |
Signal, FTC module X2 terminal 12 | B1395 02 | B367B 59 | -- | -- |
Signal, FTC module X2 terminal 17 | B367F 59, B1010 08 | B367F 59, B1010 08 | -- | -- |
Signal, FTC module X2 terminal 18 | B1307 59 | B1307 59 | -- | -- |
Signal, FTC module X2 terminal 19 | B366E 59 | B366E 59 | -- | -- |
Signal, FTC module X2 terminal 20 | B366B 59 | B366B 59 | -- | -- |
Signal, FTC module X2 terminal 23 | B1296 06 | B1296 06 | B1296 01 | -- |
Signal, FTC module X2 terminal 24 | B367A 59 | B1395 02 | -- | -- |
Valve 1 control | B3674 02 | B3674 04 | B3674 01 | -- |
Valve 2 control | B3674 02 | B3674 04 | B3674 01 | -- |
Folding top pump motor direction A voltage control | B3680 02 | B3680 04 | B3680 01 | -- |
Folding top pump motor direction B voltage control | B3680 02 | B3680 04 | B3680 01 | -- |
Low reference circuit | -- | B3674 01, B3675 01, B1010 08 | 4 | -- |
Ground, FTC module X1 terminal 25 | -- | B1345 04 | -- | -- |
Ground, FTC module X1 terminal 27 | -- | 1 | -- | -- |
1. No communication with FTC module 2. Passenger side windows inoperative during top operation 3. Driver side windows inoperative during top operation 4. Folding top malfunction | ||||
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
Connector End View Reference
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
- Ignition ON, observe the scan tool Luggage Barrier in Place parameter. The reading should be Yes.
- Perform the Folding Top Inoperative from the Open/Close Switch test.
| ⇒ | If the parameter is No, perform the Luggage Barrier Inoperative test. |
Circuit/System Testing
Luggage Barrier Inoperative
- Ignition OFF, disconnect the harness connector at the rear compartment partition position switch (S20).
- Test for less than 3 ohms of resistance between the ground circuit terminal B and ground.
- 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 all circuits test normal, test or replace the rear compartment partition position switch.
| ⇒ | If greater than the specified range, test the ground 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 FTC module. |
Folding Top Inoperative from the Open/Close Switch
- Ignition OFF, disconnect the folding top open/close switch.
- Test for less than 2 ohms of resistance between the ground circuit terminal B and ground.
- Ignition ON, verify the scan tool Top Control Switch parameter is Idle.
- Install a 3A fused jumper wire between the signal circuit terminal C and ground. Verify the scan tool Top Control Switch parameter is Opening.
- 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 all circuits test normal, test or replace the folding top open/close switch.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | 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. |
| ⇒ | If the parameter is Idle, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the FTC module. |
| ⇒ | If the parameter is Idle, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the FTC module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
