B3665

DTC B3665

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 Descriptors
DTC B3665
- Front Tonneau Position Error




Diagnostic Fault Information









Circuit/System Description

The folding top control (FTC) module supplies a 5-volt reference and low reference circuit to the front tonneau position sensor. The position sensor sends a voltage signal, that varies with the movement of the front tonneau, through the signal circuit to the FTC module. Then based on this voltage signal, the FTC module determines the position of the front tonneau and continues with the operating sequence. This voltage is converted and displayed as counts on the scan tool. Each count equals 0.0196 volt.


Conditions for Running the DTC

The FTC module must be powered and can not have B1327 or B1328 set as active DTCs for this DTC to set.


Conditions for Setting the DTC

If the FTC module sees the analog input from the front tonneau position sensor as either less than 12 counts or greater than 242 counts. The position sensor will be considered out of range and the FTC module will set this DTC.


Action Taken When the DTC Sets

* The FTC module disables all folding top functions.
* If the condition occurs during operation of the folding top, once the top control switch is released, the FTC module will send a class 2 message to the driver information center (DIC), displaying: TOP NOT SECURE.



Conditions for Clearing the DTC

* The FTC module will clear the DTC as an active malfunction when it sees the analog input from this position sensor as between 12 counts and 242 counts during one cycle of checking the FTC module inputs.
* A history DTC will clear after 50 consecutive ignition cycles without a fault present.



Diagnostic Aids

* All position sensors use common ground and 5-volt reference circuits.
* Multiple DTCs, B3665, B3666 B3670, and B3971 can set:

- If the 5-volt reference circuit is shorted to voltage
- If the 5-volt reference circuit is shorted to ground
- If the position sensor ground circuit is open

* The Rear Compartment Lid is also referenced as the Deck Lid for this vehicle.



Reference Information
Schematic Reference

Folding Top Schematics ([1][2]Convertible Top)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Power Folding Top Description and Operation (Power Folding Top 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) for Scan Tool Information


Circuit/System Verification

Ignition ON, observe the scan tool Front Tonneau Position Sensor parameter. The reading should be between 12 and 242 Counts.


Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the front tonneau position sensor.
2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal C and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuits test normal, replace the FTC module.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.

• If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the FTC module.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the FTC module.

4. Verify the scan tool Front Tonneau Position Sensor parameter is less than 10 Counts.

• If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the FTC module.

5. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal A. Verify the scan tool Front Tonneau Position Sensor parameter is greater than 242 Counts.

• If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the FTC module.

6. If all circuits test normal, test or replace the front tonneau position sensor.



Repair Instructions

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

* Folding Top Stowage Compartment Front Closeout Panel Position Switch Replacement (Folding Top Stowage Compartment Front Closeout Panel Position Switch Replacement)
* Control Module References (Programming and Relearning) for FTC module replacement, setup, and programming