Fixed and Moveable Windows

DTC B1420

Circuit Description

The body control module (BCM) applies battery voltage to the accessory voltage circuit when the ignition is in the ON position. The folding top control (FTC) module monitors this circuit at least once every 300 milliseconds to determine if voltage is supplied to the following folding top switches:

* Top open switch
* Top closed switch
* Luggage barrier switch
* Folding top cover open switch
* 5 bow raised switch
* 5 bow lowered switch
* Pin receiver switch

DTC Descriptor

The diagnostic procedure supports the following DTC:

DTC B1420 Device Voltage

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

* 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.

Test

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