GM Service Manual Online
For 1990-2009 cars only

Circuit Description

The folding top control (FTC) module checks the integrity of the signal circuit from the rear compartment lid pulldown actuator at least once every 300 milliseconds. The rear compartment lid pulldown actuator has a constant battery positive voltage supplied. During truck or folding top operation, the rear compartment lid pulldown actuator will apply the battery positive voltage to the FTC module. The FTC uses this signal as assurance that the latch is clear of the striker.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1297 Trunk Unlatched Signal Circuit

Conditions for Running the DTC

The battery voltage is between 9-16 volts.

DTC B1327 is not currently set.

Conditions for Setting the DTC

    • If the FTC module detects a short to battery in the rear compartment pulldown actuator circuit when the rear compartment lid is not ajar.
    • If the FTC module detects an open in the rear compartment pulldown actuator circuit for more than 5 seconds when the rear compartment lid is ajar.

Action Taken When the DTC Sets

    • Stores a current and history DTC B1297 in the FTC module.
    • The rear compartment lid pulldown feature and folding top operation shall be suspended until the fault is corrected.

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

Manual operation of the rear compartment lid may cause DTC B1297 to set.

A fault which allows the rear compartment lid to release, but does not allow normal folding top function, will set a DTC B1297. Refer to Symptoms - Roof .

Step

Action

Yes

No

Schematic Reference: Folding Top Schematics

Connector End View Reference: Power Roof Systems Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

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. With a scan tool, select the display DTCs function in the roof menu.

Is DTC B1297 set as a current DTC?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

  1. Close the rear compartment lid.
  2. With a scan tool, observe the deck lid latch switch status under inputs, in FTC.

Does the status display Deck Closed?

Go to Step 4

Go to Step 5

4

  1. Using the mechanical key, open the rear compartment lid so it is only ajar.
  2. With a scan tool, observe the deck lid latch switch status under inputs, in FTC.

Does the status display Deck Open?

Go to Diagnostic Aids

Go to Step 6

5

  1. Disconnect the rear compartment lid pulldown actuator harness connector.
  2. Connect a J 39200 between terminals C and H of the rear compartment lid pulldown actuator using the proper terminal adapters.
  3. Measure continuity between terminals H and C of the rear compartment lid pulldown actuator.

Is there continuity between terminals C and H of the rear compartment lid pull down actuator?

Go to Step 9

Go to Step 6

6

Test the rear compartment lid pulldown actuator signal circuit for a short to B+. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 8

7

Test the rear compartment lid pulldown actuator signal circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 8

8

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 to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

9

Inspect for poor connections at the harness connector of the rear compartment lid pullodwn actuator. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 10

10

Replace the rear compartment lid pulldown actuator. Refer to Rear Compartment Lid Latch Replacement .

Did you complete the replacement?

Go to Step 12

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11

Important: Perform the setup procedure for the FTC module.

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

Did you complete the replacement?

Go to Step 12

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12

  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.

Does the DTC reset?

Go to Step 2

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