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 Descriptor

DTC B1335 03: Device Power 3 Circuit voltage below threshold

Circuit/System Description

The folding top control (FTC) module receives B+ on C 1, pin 26. The FTC Module monitors this circuit for proper operation.

Conditions for Running the DTC

The FTC module is active.

Conditions for Setting the DTC

Voltage is less than 8 volts when active, or 9 volts when inactive.

Action Taken When the DTC Sets

The top is disabled.

Conditions for Clearing the DTC

The fault is no longer present and the top completes one cycle.

Diagnostic Aids

A weak battery can cause DTC B1335 03 to set.

Reference Information

Schematic Reference

Folding Top Schematics

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

    •  Scan Tool Data List
    •  Scan Tool Data Definitions
    •  Scan Tool Output Controls

Circuit/System Testing

  1. Disconnect the battery positive voltage circuit C 1, pin 26.
  2. Test for more than 9 volts at the battery positive voltage circuit.
  3. If circuit is less than 9 volts, test for an open, high resistance, or short to ground.
  4. If circuit tests OK, replace the FTC Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Folding Top Control Module Replacement