GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2004 🢒 XLR 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 DTC B1300

Circuit Description

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

    • Convertible top header latched switch signal of the header latched switch.
    • Convertible top header unlatched switch signal of the header unlatched switch.

Both switches are supplied accessory voltage, and when a switch is active, it will apply the voltage signaling the FTC module.

The header latched switch will close, signaling the FTC module when the header latch has latched and secured the folding top when it is in either the closed or stowed position. The header unlatched switch will close, signaling the FTC module when the folding top latch is in the fully unlatched position. This would be when the folding top is between the closed and stowed positions.

DTC Descriptor

The diagnostic procedure supports the following DTC.

DTC B1300 Convertible Top Header Latched Sensor Circuit

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 header latched and header unlatched switch signal circuits being active at the same time.

Action Taken When the DTC Sets
    • Stores a current and history DTC B1300 in the FTC module.
    • The folding top operation is suspended.
    • 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.
    • History and current DTC can be cleared using the scan tool.

Diagnostic Aids

If the DTC does not reset after the code is cleared, then one of the switches may be the intermittent fault. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Step

Action

Yes

No

Schematic Reference: Folding Top Schematics

Connector End View Reference: Power and Grounding Connector End Views in Wiring Systems

1

Did you perform the Vehicle Control Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Wait four minutes.
  4. Open the hydraulic fluid bypass valve located above the pump motor, turning it counterclockwise.
  5. Use the FT wrench to close the header latch. To access the header latch, refer to Opening the Folding Top or Closing the Folding Top .
  6. With a scan tool, observe the Header Latch Limit Switches parameter in the data list for the folding top control module.

Does the scan tool display Latched?

Go to Step 3

Go to Step 4

3
  1. Use the FT wrench to open the header latch fully.
  2. With a scan tool, observe the Header Latched Limit Switch parameter in the data list for the folding top control module.

Does the scan tool display Unlatched?

Go to Diagnostic Aids

Go to Step 5

4

Test the signal circuit of the header unlatched switch for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 7

Go to Step 5

5

Test the signal circuit of the header latched switch for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 6

6

Test the header latched switch for proper operation.

Did the switch operate correctly?

Go to Step 8

Go to Step 9

7

Test the header unlatched switch for proper operation.

Did the switch operate correctly?

Go to Step 8

Go to Step 10

8

Important: Perform the setup procedure for the folding top control module.

  1. Replace the folding top control module. Refer to Folding Top Control Module Replacement .
  2. Perform the setup procedure for the folding top control module. Refer to Power Folding Top Learn .

Did you complete the replacement?

Go to Step 11

--

9

Replace the header latched switch. Refer to Folding Top Front Latch Position Sensor Switch Replacement .

Did you complete the replacement?

Go to Step 11

--

10

Replace the header unlatched switch. Refer to Folding Top Front Latch Position Sensor Switch Replacement .

Did you complete the replacement?

Go to Step 11

--

11
  1. Use the scan tool in order to clear the DTCs.
  2. Close the hydraulic fluid bypass valve located above the FT motor, turning it clockwise.
  3. Operate the vehicle within the Conditions for Running the DTC.

Does the DTC reset?

Go to Step 2

System OK