B3641

DTC B3641

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.



DTC Descriptor
DTC B3641
- Trunk Close Switch Circuit




Diagnostic Fault Information






Circuit Description

The folding top control (FTC) module checks the integrity of the signal circuits from the rear compartment lid release close switch at least once every 300 milliseconds. The rear compartment lid release close switch has a constant battery positive voltage supplied. Pressing the rear compartment lid release close switch will apply the battery positive voltage to the rear compartment lid release close switch signal circuit to the FTC module. The FTC module monitors the signal request and will operate the rear compartment lid when battery positive voltage is received.


Conditions for Running the DTC

* Battery voltage must be between 9-16 volts.
* DTC B1327 is not set as current.



Conditions for Setting the DTC

The FTC module detects a short to battery in the rear compartment lid release close switch circuit for more than 5 seconds.


Actions Taken When the DTC Sets

* FTC module stores DTC B3641 to memory.
* The rear compartment lid pull-down feature will be inactive from the rear compartment lid release close switch.



Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* You issue a scan tool CLEAR DTCs command.
* A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.



Diagnostic Aids

A rear compartment lid release close switch that is held or stuck in the closed position for more than 5 seconds will set DTC B3641.


Reference Information
Schematic Reference

Release Systems Schematics (Release Systems Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Luggage Compartment Description and Operation (Coupe) (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)


Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the rear compartment lid release/close switch.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal D and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the signal circuit terminal A for a short to ground.

3. Verify that a test lamp does not illuminate between the signal circuit terminal A and ground.

• If the test lamp illuminates, test the signal circuit terminal A for a short to voltage. If the circuit tests normal, replace the FTC module.

4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal D and signal circuit terminal A.

• If the test lamp does not illuminate, test the signal circuit terminal A for an open/high resistance. If the circuit tests normal, replace the FTC module.

5. If all circuits test normal, test or replace the rear compartment lid release/close switch.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Rear Compartment Lid Latch Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for FTC module replacement, setup, and programming