GM Service Manual Online
For 1990-2009 cars only

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.

DTC Descriptors

DTC B1011: System Disabled Information Stored

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 Control Switch Battery Voltage

2

2

--

--

Folding Top Control Switch Close Signal

2

2

B3602

--

Folding Top Control Switch Open Signal

2

2

B3602

--

Front Panel Position Sensor 5-Volt Reference

B3665, B3666, B3971

B3665

B3665, B3666, B3670, B3971

--

Front Panel Position Sensor Signal

B3665

B3665

B3665

--

Front Panel 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 Panel Position Sensor 5-Volt Reference

B3665, B3666, B3971

B3666

B3665, B3666, B3670, B3971

--

Rear Panel Position Sensor Signal

B3666

B3666

B3666

--

Rear Panel Position Sensor Low Reference

--

B3666

--

--

Folding Top Pump Motor Temperature Sensor 5-Volt Reference

B3665, B3666, B3971

2, 7

B3665, B3666, B3971, B3670

--

Folding Top Pump Motor Temperature Sensor Signal

2, 7

2, 7

B3670

--

Hard Top Connected Signal

B1420

4, 7

B1310

--

Folding Top Closed Switch Control

B1420

4, 7

--

--

Front Latched Position Switch Signal

B1420, 3, 4, 7

3, 4, 7

B1300

--

Front Latched Position Switch Control

B1420

3, 4, 7

--

--

Front Unlatched Position Switch Signal

B1420, 9

9

B1300

--

Front Unlatched Position Switch Control

B1420

9

--

--

Compartment Partition Position Switch Signal

B1420, 2, 7

2, 7

8

--

Compartment Partition Position 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

--

--

Folding Top Valve 1 Control

1

3

--

--

Folding Top Valve 1 - Ground

--

3

--

--

Folding Top Valve 2 Control

1

4

--

--

Folding Top Valve 2 - Ground

--

4

--

--

Folding Top Valve 3 Control

1

3, 4, 6

--

--

Folding Top Valve 3 - Ground

--

3, 4, 6

--

--

Folding Top Valve 4 Control

1

B1297, 3, 4, 5

--

--

Folding Top Valve 4 - Ground

--

B1297, 3, 4, 5

--

--

Folding Top Valve 5 Control

1

2

--

--

Folding Top Valve 5 - Ground

--

2

--

--

1. No communication with the FTC 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 rear compartment partition removed

9. No effect on power folding top operation

Circuit/System Description

Battery positive voltage is supplied to the folding top control (FTC) module from the BATT 2 fuse located in the underhood fuse block. When commanded, this voltage is used by the FTC module to power the folding top pump motor through the motor control circuits. When an overcurrent condition is detected, the FTC module disables the folding top pump motor in order to protect the internal FTC module circuitry.

Conditions for Running the DTC

The FTC module monitors for over current only when the power folding top pump motor is active.

Conditions for Setting the DTC

The FTC module will set DTC B1011 when the measured current exceeds 81 amps for 100 milliseconds.

Action Taken When the DTC Sets

    • All folding top functions in progress are aborted, including calibrations of the folding top.
    • The FTC module will suspend operation of the folding top pump motor.

Conditions for Clearing the DTC

    • This DTC will clear on the current status after the condition for setting the fault is corrected.
    • A history DTC will clear after 50 consecutive ignition cycles without a fault present.

Diagnostic Aids

The Rear Compartment Lid is also referenced as the Deck Lid for this vehicle.

Reference Information

Schematic Reference

Folding Top Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Folding Top Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for Scan Tool Information

Circuit/System Testing

  1. If needed, manually open the deck lid to access the hydraulic fluid bypass valve.
  2. Turn the hydraulic fluid bypass valve counterclockwise to inhibit folding top movement. Refer to Folding Top Manual Operation.
  3. Ignition OFF, disconnect the harness connector at the folding top pump motor.
  4. Connect a test lamp between control circuit terminal A and control circuit terminal B.
  5. Ignition ON, command the Pump Motor A Direction and Pump Motor B Direction On and Off with a scan tool. The test lamp should turn ON when commanding the Pump Motor A Direction and Pump Motor B Direction states.
  6. If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the FTC module.
  7. If all circuits test normal, replace the folding top pump motor assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Folding Top Pump with Motor Replacement
    •  Control Module References for FTC module replacement, setup, and programming