For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B1420: Device VoltageCircuit/System Description
The driver door module (DDM) and passenger door module (PDM) check for proper system voltage of 9-16 volts at least once every 20 milliseconds. When the DDM or PDM detects that system voltage is either below 9 volts or above 16 volts, a DTC is set and DTC updates are disabled.
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.
Actions 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
| • | DTC B1420 may set during vehicle startup if the vehicle system voltage falls bellow 9 volts. |
| • | The Starting/Charging system may be the cause of an intermittent malfunction. |
Reference Information
Schematic Reference
Connector End View Reference
Window Systems Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the appropriate door control module harness connector.
- Test for less than 1.0 ohm of resistance between the ground circuit terminal 10 and ground.
- If all circuits test normal, replace the appropriate door control module.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for DDM or PDM replacement, setup, and programming
