Circuit Description
The folding top control (FTC) module monitors the accessory voltage at least once every 300 milliseconds. This accessory voltage is protected by the trunk latch/top switch 15-amp fuse that also supplies voltage to other limit switches:
| • | Header latched switch |
| • | Header unlatched switch |
| • | Cargo cover luggage barrier switch |
| • | Rear compartment lid open switch or deck lid open switch |
| • | Top closed switch |
DTC Descriptor
The diagnostic procedure supports the following DTC:
DTC B1420 Device Voltage
Conditions for Running the DTC
The battery voltage is between 9-16 volts.
Conditions for Setting the DTC
| • | If the FTC module detects the accessory voltage dropping below 3 volts. |
| • | The power mode is either in Accessory, RUN, Rap or Crank. |
Action Taken When the DTC Sets
| • | Stores a current and history DTC B1420 in the FTC module. |
| • | The folding top operation is suspended. |
| • | 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
| • | 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
If the DTC does not reset after the code is cleared, then the accessory voltage circuit between the fuse and the FTC module may be the intermittent fault. Refer to Testing for Intermittent Conditions and Poor Connections .
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Folding Top Schematics Connector End View Reference: Power and Grounding Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Is the DTC B1420 present? | -- | Go to Step 3 | Go to Diagnostic Aids |
3 | Measure the accessory voltage at the folding top control (FTC) module harness connector. Does the voltage measure near the specified value? | 9-16 V | Go to Step 4 | Go to Step 5 |
4 | Inspect for poor connections at the harness connector of the folding top control module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 8 |
5 |
Does the scan tool display Closed? | -- | Go to Step 6 | Go to Step 7 |
6 | Repair the accessory voltage circuit for an open or high resistance between the FTC module and the splice. Refer to Circuit Testing and to Wiring Repairs . Did you complete the repair? | -- | Go to Step 7 | -- |
7 | Repair the accessory voltage circuits for an open, high resistance and a short to ground. Refer to Circuit Testing and to Wiring Repairs . Did you complete the repair? | -- | Go to Step 9 | -- |
8 | Replace the FTC module. Refer to Control Module References for replacement, setup, and programming . Did you complete the replacement? | -- | Go to Step 9 | -- |
9 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
