Roof and Associated Components
DTC B1420
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.
TEST
