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 B1300: Convertible Top Header Latched Sensor Circuit

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

The folding top control (FTC) module checks the circuits listed, at least once every 300 milliseconds:

    • Latched switch signal of the front latched switch.
    • Unlatched switch signal of the front unlatched switch.

The front latched switch will close to B+, signaling the FTC module when the front latch has latched and secured the folding top when it is in either the closed or stowed position. The front unlatched switch will close to B+, signaling the FTC module when the folding top latch is in the fully unlatched position. This happens when the folding top is between the closed and stowed positions.

Conditions for Running the DTC

The battery voltage is between 9-16 volts.

Conditions for Setting the DTC

The FTC module detects inputs from both the front latched and front unlatched switch signal circuits being active at the same time.

Action Taken When the DTC Sets

    • The FTC module disables all folding top functions.
    • The FTC module sends a class 2 message to the driver information center (DIC), displaying: TOP NOT SECURE.

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 Verification

  1. When the folding top is in the fully closed or stowed position, the front unlatch switch is open, the front latch switch is closed to B+ and the scan tool Header Latch Limit Switches parameter should be Latched.
  2. If not the specified value, refer to the Unlatched Position Switch Test.
  3. When the folding top is unlatched or in between the closed and stowed positions, the front latch switch is open, the front unlatched switch is closed to B+ and the scan tool Header Latch Limit Switches parameter should be Unlatched.
  4. If not the specified value, refer to the Latched Position Switch Test.

Circuit/System Testing

Unlatched Position Switch Test

  1. Open the hydraulic fluid bypass valve located above the pump motor by turning it counterclockwise.
  2. Use the FT wrench to manually open the front latch. To access the front latch, refer to Folding Top Manual Operation.
  3. Ignition OFF, disconnect the harness connector at the folding top front latch position switch-unlatched.
  4. Ignition ON, verify the scan tool Header Latch Limit Switches parameter is Mid.
  5. If not the specified value, test the signal circuit terminal A for a short to voltage. If the circuit tests normal, replace the FTC module.
  6. 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.
  7. If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the FTC module.
  8. If all circuits test normal, test or replace the folding top front unlatched position switch.

Latched Position Switch Test

  1. Open the hydraulic fluid bypass valve located above the pump motor by turning it counterclockwise.
  2. Use the FT wrench to manually open the front latch. To access the front latch, refer to Folding Top Manual Operation.
  3. Ignition OFF, disconnect the harness connector at the folding top front latch position switch-latched.
  4. Ignition ON, verify the scan tool Header Latch Limit Switches parameter is Mid.
  5. If not the specified value, test the signal circuit terminal A for a short to voltage. If the circuit tests normal, replace the FTC module.
  6. 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 Latched.
  7. If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the FTC module.
  8. If all circuits test normal, test or replace the front latch position switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Folding Top Front Latch Position Sensor Switch Replacement
    •  Control Module References for FTC module replacement, setup, and programming