GM Service Manual Online
For 1990-2009 cars only

Circuit Description

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

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1011 System Disabled Information Stored

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 looks for the following 3 possible over current conditions independently of each other:

    • High over current-The FTC module will set DTC B1011 when the measured current exceeds 90 amps for 30 milliseconds. This tests runs every 3 milliseconds.
    • Medium over current-The FTC module will set DTC B1011 when the measured current exceeds 60 amps for 1 seconds. This tests runs every 3 seconds.
    • Low over current-The FTC module will set DTC B1011 when the measured current exceeds 40 amps for 30 seconds. This tests runs every 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

    • The 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.
    • A history and current DTC can be cleared using the scan tool.

Diagnostic Aids

Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This test determines if the suspect motor has an internal short to ground.

  2. This test verifies the repair.

Step

Action

Yes

No

Schematic Reference: Folding Top Schematics

Connector End View Reference: Folding Top Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Diagnostic Trouble Codes (DTC) in the Folding Top Module data list.
  4. Attempt to operate the power folding top in both directions.

Did the scan tool display DTC B1011?

Go to Step 3

Go to Diagnostic Aids

3

  1. Disconnect the inline harness connector at the pump motor.
  2. Connect a test lamp between the folding top motor control circuits A and B of the inline connector.
  3. With a scan tool navigate to Folding Top Module in the Special Function menu of the Roof Service Category.
  4. With the scan tool, command the direction of the pump motor to the X/A and then Y/B directions.

Does the test lamp illuminate with each command?

Go to Step 4

Go to Step 5

4

Test the motor control circuits of the folding top pump motor for a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 9

Go to Step 6

5

Inspect for poor connections at the harness connector of the folding top pump motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 9

Go to Step 7

6

Inspect for poor connections at the harness connector of the folding top control (FTC) module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Replace the folding top pump, valve, and motor assembly. Refer to Folding Top Pump with Motor Replacement .

Did you complete the replacement?

Go to Step 9

--

8

Replace the FTC module. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 9

--

9

  1. Clear the DTCs using the scan tool.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK