Circuit 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.
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
| • | 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. |
| • | 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 Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Power Window Schematics and Door Control Module Schematics Connector End View Reference: Power Door Systems Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Verify that the vehicle's Starting/Charging system is operating properly. Is the Starting/Charging system operating properly? | Go to Step 3 | Go to Symptoms - Engine Electrical in Engine Electrical |
3 | Test the appropriate door module ground circuit for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | Go to Step 4 |
4 | Inspect for poor connections at the harness connector of the appropriate door module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | Go to Step 5 |
5 | Replace the appropriate door module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? | Go to Step 6 | -- |
6 |
Does the DTC reset? | Go to Step 2 | System OK |
