Doors, Hood and Trunk Diagnosis
DTC B1420
CIRCUIT DESCRIPTION
The driver door module (DDM) and passenger door module (PDM) check for proper system voltage of 9.0-16.0 volts at least once every 20 milliseconds. When the DDM or PDM detects that system voltage is either below 9.0 volts or above 16.0 volts, a DTC is set and DTC updates are disabled.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1420-Device Voltage
CONDITIONS FOR RUNNING THE DTC
Battery voltage must be between 9-16 volts.
CONDITIONS FOR SETTING THE DTC
The DDM or PDM detects system voltage is below 9 volts or above 16 volts.
ACTION TAKEN WHEN THE DTC SETS
DTC updates are disabled.
CONDITIONS FOR CLEARING THE DTC
- The condition responsible for setting the DTC no longer exists.
- You issue a scan tool CLEAR DTCs command.
DIAGNOSTIC AIDS
- The Starting/Charging system may be the cause of an intermittent malfunction.
- Thoroughly inspect the wiring and connectors. An incomplete inspection of the wiring and connectors may result in misdiagnosis causing part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.
TEST
