B1307 on 2006-2009 Pontiac G6: Convertible Header Latch Switch Fault and Fixes

What's Unique About the 2006-2009 Pontiac G6

The Pontiac G6 featured a complex retractable hardtop, a sophisticated system for a car in its class at the time. This system uses a precise sequence of more than a dozen switches and sensors to operate correctly. Unlike generic OBD-II codes, B1307 is not related to the engine or oil level as it might be on other vehicles. For the G6, it is exclusively tied to the convertible top's intricate operation, and GM has issued specific diagnostic procedures for it in TSB #07-08-67-010C.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Convertible top will not start the open or close cycle.
• Convertible top stops mid-operation.
• A warning message related to the convertible top, such as 'Top Not Secure', may appear on the Driver Information Center (DIC).
🎬 Watch: Troubleshooting common cargo and top sensor error messages
• An audible chime may sound continuously while driving.
• The trunk release button may become inoperative.

Most Likely Causes

1. Faulty Folding Top Bell Crank Switch (S14) 🔴 High Probability The switch is a small electromechanical microswitch that can fail over time with repeated use of the convertible top. It is exposed to stress and vibration within the header latch assembly.
   How to confirm: Using a GM-specific scan tool, monitor the switch's status ('over-center' or 'not over-center'). Manually actuate the switch with a finger (headliner removed) and verify the status changes on the scan tool. A distinct 'click' should be heard when the switch is actuated. If the status doesn't change, the switch is likely faulty.
   Typical fix: Replace the faulty switch. The switch is part of the header latch assembly and may be difficult to source individually. Some parts diagrams show it as part of a wiring harness. The GM part number for the harness that includes the bell crank switch is 15926163.
   Est. part cost: $50-$150
2. Damaged Wiring or Connector 🟡 Medium Probability The wiring for the switch is routed within the roof panel and along hinges, making it susceptible to chafing, pinching, or breaking from the repeated movement of the top. This is a known issue across the convertible top system.
   How to confirm: Visually inspect the wiring harness and connector leading to the bell crank switch for any signs of damage, chafing, or corrosion. Perform a continuity test on the wires between the switch and the Folding Top Control (FTC) module. The TSB specifically mentions checking for mis-routed or improperly secured harnesses.
   Typical fix: Repair the damaged section of the wire or replace the connector pigtail. Solder and heat-shrink the repaired wires for a durable fix.
   Est. part cost: $10-$30
3. Mechanical Latch Malfunction ⚪ Low Probability Binding or mis-alignment in the header latch mechanism could prevent the switch from being properly actuated. This can be caused by a lack of lubrication or physical damage.
   How to confirm: Visually inspect the header latch mechanism for any binding, damage, or foreign objects that would prevent full travel and stop it from engaging the switch. The TSB suggests verifying the latching system moves freely.
   Typical fix: Lubricate, adjust, or replace the binding mechanical components of the latch assembly.
   Est. part cost: $100-$400

Rare But Worth Checking

• Faulty Folding Top Control (FTC) Module: This is very rare. TSB #07-08-67-010C specifically warns 'Do not replace the FTC Module' before thoroughly diagnosing the switches and wiring, as they are the much more common failure points.

Diagnosis Steps

1. Connect a GM-specific scan tool (e.g., Tech 2) to the vehicle.
2. Access the Folding Top Control (FTC) module and read the Diagnostic Trouble Codes (DTCs).
3. Confirm B1307 is present. Navigate to the live data screen for the convertible top switches.
4. Monitor the parameter for the 'Folding Top Bell Crank Switch' (S14).
5. Carefully remove the A-pillar trim and then the front portion of the headliner to gain access to the header latch mechanism.
6. Locate the switch on the center drive of the header latch.
7. Manually operate the switch with your finger. Watch the scan tool to see if the status changes correctly from 'over-center' to 'not over-center' and back. Listen for an audible click from the microswitch.
8. If the status does not change, disconnect the switch and test it for continuity with a multimeter.
9. If the switch tests good, inspect the wiring harness and connector for damage, corrosion, or loose pins between the switch and the FTC module. Pay close attention to areas where the harness bends or moves.
10. If both the switch and wiring are confirmed to be good, the issue may lie with the FTC module, but this is the least likely cause and should be the last component to be replaced.

Parts You'll Likely Need

• Folding Top Header Bell Crank and Hall Wire Harness (OEM #15926163) — This harness includes the 'Folding Top Bell Crank Switch' (S14) which is the direct cause of the B1307 code. The switch itself is a common failure point, and GM often services it as part of this harness assembly.
  Trusted brands: GM Genuine
  OEM price range: $70-$180
  Aftermarket price range: N/A

Related Codes That Often Appear With This One

• B1010 — B1010 is a general code for Electronic Control Unit (ECU) hardware malfunction. It can sometimes appear with other more specific codes if the module is failing, but often the specific switch code (like B1307) is the root cause.
• B1296, B3669, B367A, etc. — These are other switch-related codes for the G6 retractable top. If multiple switches fail to report in the correct sequence, or if a wiring harness with multiple circuits is damaged, several codes may be stored.

Technical Service Bulletins (TSBs) & Recalls

• 07-08-67-010C: Retractable Hard Top (RHT)/Convertible Switch Diagnosis. This TSB is the primary source for defining and diagnosing code B1307 on the G6, identifying it as the 'Folding Top Bell Crank Switch'. It provides the exact parameter names to monitor on a Tech 2 scan tool ('over-center' / 'not over-center') and explicitly warns against unnecessarily replacing the control module or hydraulic pump.

Platform-Specific Known Issues

• The GM Technical Service Bulletin #07-08-67-010C specifically addresses this and other related switch codes, indicating it's a known issue. The bulletin provides a diagnostic chart for technicians to follow.
• Owner experiences shared on forums frequently point to either the header latch microswitch or broken wires in the trunk hinge area as the culprits for top failures. One owner on a Reddit thread described a scenario where the top stopped mid-operation, which is a classic symptom of a switch failure.
• Another common complaint tied to top failure is the 'Top not secure' message, which can be caused by any of the dozen-plus switches in the system, including the one tied to B1307.

Mechanic-Grade Diagnostic Values

• 12-volt Reference Circuit Voltage at Switch Connector — expected: Test lamp connected to ground should illuminate.. Failure: If the test lamp does not illuminate, the 12-volt reference circuit has a short to ground or an open.
• Signal Circuit Voltage at Switch Connector — expected: Test lamp connected to B+ (battery positive) should illuminate.. Failure: If the test lamp does not illuminate, the signal circuit has an open or high resistance.
• Scan Tool Live Data for 'Folding Top Bell Crank Switch' (S14) — expected: Parameter should toggle between 'over-center' and 'not over-center' when the switch is manually actuated.. Failure: If the status does not change, the switch, wiring, or FTC module is faulty.

Scan Tool Commands That Help

• Tech 2: Data Display > Folding Top Control (FTC) > Switch Status — This is the primary diagnostic step to monitor the live status of the 'Folding Top Bell Crank Switch' (S14) to see if it is changing state as expected when manually operated. It confirms if the fault is with the switch or its circuit.

Wiring & Ground Locations

• Folding Top Control (FTC) Module — On the right rear of the passenger compartment, located under the right rear seat back.. This is the module that receives the signal from the bell crank switch (S14) and controls the top's operation. All wiring for the switch ultimately terminates here.
• G301 — On the right rear of the passenger compartment, near the FTC module.. This is the primary ground point for the Folding Top Control (FTC) module. A poor ground here can cause erratic behavior and various DTCs, including B1307.
• Header Latch Harness Bundle — Within the front section of the retractable hardtop, routed to the center latch mechanism.. This harness contains the wiring for the bell crank switch (S14). It is a known chafe point due to the movement of the top, and TSB #07-08-67-010C specifically calls for checking it for damage.

Model Year Variations Within This Range

• 2008-2009: A 2008 report noted that Karmann, the top manufacturer, supplied a revised, more robust retractable top to improve panel-to-panel latching and reduce rattles. While this indicates a physical change to the top assembly, it is not known to directly affect the diagnosis of code B1307.