Circuit Description
The folding top control (FTC) module supplies accessory voltage to the folding top cover open limit switch. It monitors the signal circuit of this switch to determine the open and closed position of the folding top cover. At the same time the body control module (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.
When the folding top cover is in the closed position the following definitions of the folding top cover latch and the folding top cover open limit switch should be true:
| • | Tonneau open limit switch-The switch is open and the scan tool parameter should display Inactive. |
| • | Tonneau latch switch-The switch is open and the scan tool parameter should display Closed. |
When the folding top cover is in the open position, the following definitions of the folding top cover latch and the folding top cover open limit switch should be true:
| • | Tonneau open limit switch-The switch is closed to voltage and the scan tool parameter should display Active. |
| • | Tonneau latch switch-The switch is closed to ground and the scan tool parameter should display Ajar. |
DTC Descriptor
The diagnostic procedure supports the following DTC:
DTC B3666 Rear Tonneau Position Error
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
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
| • | Stores a current and history DTC B3666 in the FTC module. |
| • | The folding top operation is suspended. |
| • | The FTC module will send a class 2 message to the driver information center (DIC) to display TOP NOT SECURE. |
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. |
| • | History and current DTC can be cleared using the scan tool. |
Diagnostic Aids
| • | When using the scan tool the folding top cover is referenced as the tonneau. |
| • | The folding top cover must be in the fully open position with the switch closed to battery voltage for B3666 to be a current DTC. |
| • | If the DTC does not reset after the code is cleared, then the switch may be the intermittent fault. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
Test Description
The numbers below refers to the step numbers on the diagnostic table.
-
This step determines the integrity of the folding top cover latch. The folding top cover must be in the open position with the tonneau limit switch parameter displaying Active in order for this step to be a valid test.
-
This step determines the integrity of the folding top cover open limit switch. The folding top cover must be closed and latched in order for this step to be a valid test.
-
This step determines the integrity of the folding top cover pull down ajar signal circuit. A short to ground in this circuit may have inadvertently set this DTC.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Folding Top Schematics Connector End View Reference: Power Roof Systems Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 3 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Did the DTC reset? | Go to Step 3 | Go to Diagnostic Aids |
3 | Determine the open or closed position of the folding top cover. Is the folding top cover in the open position? | Go to Step 4 | Go to Step 5 |
Does the Tonneau Latch Switch parameter display Ajar? | Go to Step 9 | Go to Step 6 | |
Does the Tonneau Open Limit Switch parameter display Active? | Go to Step 8 | Go to Step 9 | |
6 |
Does the Tonneau Latch Switch parameter display Ajar? | Go to Step 7 | Go to Step 10 |
7 |
Does the Tonneau Latch Switch parameter display Ajar? | Go to Step 13 | Go to Step 17 |
8 |
Does the Tonneau Open Limit Switch parameter display Active? | Go to Step 11 | Go to Step 14 |
Does the Power Pull Down Ajar Status parameter display Ajar? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 12 | |
10 | Test the folding top cover ajar signal circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 16 |
11 | Test the signal circuit of the folding top cover open limit switch for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 15 |
12 | Test the folding top cover pull down ajar signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 16 |
13 | Inspect for poor connections at the harness connector of the folding top cover latch actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 18 |
14 | Inspect for poor connections at the harness connector of the folding top cover open limit switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 19 |
15 | Inspect for poor connections at the harness connector of the folding top control (FTC) module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 20 |
16 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 21 |
17 | Repair the high resistance or open in the ground circuit of the folding top latch actuator connector C2. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 22 | -- |
18 | Replace the folding top cover latch actuator. Refer to Folding Top Cover Lid, Latch, Actuator Replacement . Did you complete the replacement? | Go to Step 22 | -- |
19 |
Important: The folding top cover open limit switch is an internal part of the folding top cover hydraulic cylinder assembly that is not serviced separately. Replace the folding top cover open limit switch. Refer to Folding Top Cylinder Replacement . Did you complete the replacement? | Go to Step 22 | -- |
20 | Replace the FTC module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 22 | -- |
21 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems Did you complete the replacement? | Go to Step 22 | -- |
22 |
Does the DTC reset? | Go to Step 3 | System OK |
