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 B3666: Rear Tonneau Position ErrorDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ - Folding Top Control Module | 1 | 1 | -- | -- |
Folding Top Cover Open Switch Signal | B1420 | 3, 4 | B3666 | -- |
Folding Top Cover Ajar Signal | 5, 6 | B3666, | -- | -- |
Ground - Folding Top Cover Latch Actuator | -- | B3666, 2, 3, 5 | -- | -- |
Ground - Folding Top Control Module | -- | 1 | -- | -- |
1. No communication with the FTC module. 2. Power folding top is inoperative 3. Power folding top does not open or complete the top opening procedure. 4. Power folding top does not close or complete the top closing procedure. 5. Folding top stowage compartment lid release inoperative 6. DIC Warning Message | ||||
Circuit/System Description
The body control module (BCM) supplies ignition voltage to the folding top cover open switch. The folding top control (FTC) module monitors the signal circuit of this switch to determine the open and closed position of the folding top cover. At the same time the BCM supplies battery voltage to the folding top cover latch ajar switch and monitors this circuit to determine if the folding top cover is latched or unlatched. The BCM communicates the status of the folding top cover latch ajar switch via class 2 message to the FTC module.
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 battery voltage is between 9-16 volts.
Conditions for Setting the DTC
DTC B3666 will set as a current DTC, if the FTC module senses that the folding top cover latch is not ajar while the folding top cover open limit switch is active.
Action Taken When the DTC Sets
| • | The folding top operation is suspended. |
| • | Current and history DTCs are stored. |
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
| • | The Folding Top Cover is also referenced as the Tonneau Cover. |
| • | The scan tool references the Folding Top Cover Open Switch as the Tonneau Open Limit Switch |
| • | The scan tool references the Folding Top Cover Latch as the Tonneau Latch Switch |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Power Folding Top Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
When the folding top cover is in the closed position, the following scan tool parameter definitions should be true:
| • | Tonneau Open Limit Switch -- The switch is open and the scan tool parameter should be Inactive. |
| ⇒ | If not the specified value, refer to the Folding Top Cover Open Switch Test. |
| • | Tonneau Latch Switch -- The switch is open and the scan tool parameter should be Closed. |
| ⇒ | If not the specified value, refer to the Folding Top Cover Latch Test |
When the folding top cover is in the open position, the following scan tool parameter definitions should be true:
| • | Tonneau Open Limit Switch -- The switch is closed to voltage and the scan tool parameter should be Active. |
| ⇒ | If not the specified value, refer to the Folding Top Cover Open Switch Test. |
| • | Tonneau Latch Switch -- The switch is closed to ground and the scan tool parameter should be Ajar. |
| ⇒ | If not the specified value, refer to the Folding Top Cover Latch Test. |
Circuit/System Testing
Folding Top Cover Open Switch Test
- Ignition OFF, disconnect the harness connector at the folding top cover open switch.
- Ignition ON, verify the scan tool Tonneau Open Limit Switch parameter is Inactive.
- Install a 3A fused jumper wire between the ignition circuit terminal B and the signal circuit terminal A. Verify the scan tool Tonneau Open Limit Switch parameter is Active.
- Ignition OFF, disconnect the harness connector at the folding top cover pull down actuator.
- Ignition ON, verify the scan tool Power Pull Down Ajar Status parameter is Closed.
- If all circuits test normal, test or replace the folding top cover open switch.
Important: The folding top cover open switch is an internal part of the folding top cover hydraulic cylinder assembly that is not serviced separately.
| ⇒ | If not the specified value, test the signal circuit terminal A for a short to voltage. If the circuits test normal, replace the FTC module. |
| ⇒ | If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the FTC module. |
| ⇒ | If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit test normal, replace the BCM. |
Folding Top Cover Latch Test
- Ignition OFF, disconnect the X2 harness connector at the folding top cover latch actuator.
- Test for less than 5 ohms between the ground circuit terminal B and ground.
- Ignition ON, verify the scan tool Tonneau Latch Switch parameter is Closed.
- Install a 3A fused jumper wire between the signal circuit terminal A and the ground circuit terminal B. Verify the scan tool Tonneau Open Limit Switch parameter is Ajar.
- Ignition OFF, disconnect the harness connector at the folding top cover pull down actuator.
- Ignition ON, verify the scan tool Power Pull Down Ajar Status parameter is Closed.
- If all circuits test normal, test or replace the folding top cover latch actuator.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal A for a short to ground. If the circuits test normal, replace the FTC module. |
| ⇒ | If not the specified value, test the signal circuit for an open/high resistance. If the circuits test normal, replace the BCM. |
| ⇒ | If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit test normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for FTC module and BCM replacement, setup, and programming |
