B3667
DTC B3667
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 B3667
- Tonneau Release Circuit
Diagnostic Fault Information
Circuit/System Description
When the power folding top is operated to open or close the folding top, the body control module (BCM) controls the folding top cover latch release operation through the folding top cover release relay control circuit and the tonneau release relay. The relay energizes and applies battery positive voltage to the folding top cover latch actuator. The circuit that generated this diagnostic trouble code (DTC) is the folding top cover release relay control circuit that is wired between the BCM and the tonneau release relay. The BCM applies a 12 volt low current voltage to this circuit to monitor the integrity of this circuit.
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.
* The BCM monitors the voltage of this circuit at all times even when the ignition is in the Off position.
* The module voltage must be 9-16 volts.
Conditions for Setting the DTC
* Open detected in the relay control circuit.
* Short to battery voltage detected in the relay control circuit.
* Short to ground detected in the relay control circuit.
* Open in the ground circuit of the tonneau release relay.
Action Taken When the DTC Sets
* Current and history DTCs are stored.
* Power folding top operation is disabled until the ignition is cycled OFF/Run ACC.
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.
Diagnostic Aids
* When using the scan tool, the folding top cover is referenced as the tonneau.
* Removing the tonneau release relay will set a DTC and stop power folding top operation. Once the relay is replaced, the ignition must be cycled OFF then Run ACCY in order to continue operation.
* Whenever the open/close control switch is released or the top becomes inoperative in a suspended state, pressure will be maintained in the hydraulic system to avoid drifting and damage of components. After 4 minutes, the FTC module will gradually release the hydraulic pressure allowing the top to gradually settle to a resting position.
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
When either the top open or top close control switch is pressed, the folding top cover should unlatch and rise to the open position. The scan tool Tonneau Latch Switch parameter should be Ajar.
Circuit/System Testing
1. Ignition OFF, disconnect the tonneau release relay.
2. Test for less than 1 ohm of resistance between the ground circuit terminal A9 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal B7 and ground.
4. Cycle the ignition OFF and ON in order to reset the BCM.
5. Ignition ON, command the Tonneau Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
6. If all circuits test normal, test or replace the tonneau release relay.
Component Testing
Tonneau Release Relay
1. Ignition OFF, disconnect the tonneau release relay.
2. Test for 60-120 ohms of resistance between terminals 85 and 86.
• If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals:
* 30 and 85
* 30 and 86
* 30 and 87
• If not the specified value, replace the relay.
4. Install a 3A fused jumper wire between relay terminal 85 and B+. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms of resistance between terminals 30 and 87.
• If greater than the specified range, replace the relay.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Relay Replacement (Attached to Wire Harness) (Relay Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (Relay Replacement (Within an Electrical Center))
* Control Module References (Programming and Relearning) for FTC module and BCM replacement, setup, and programming