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 VoltageDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Window Switch B+ | 1 | 1 | -- | -- |
Driver Door Module B+ | 1 | 1 | -- | -- |
Passenger Window Switch Up Signal | B3170 | 2 | 2 | -- |
Passenger Window Switch Down Signal | B3175 | 2 | 2 | -- |
Passenger Window Switch Express Down Signal | B3280 | 2 | 2 | -- |
Driver Door Module Ground | -- | B1420 | 1 | -- |
Driver Window Switch Ground | -- | 1 | 1 | -- |
Passenger Door Module Ground | -- | B1420 | 2 | -- |
Passenger Window Switch Ground | -- | 2 | 2 | -- |
1. Driver Window Malfunction 2. Passenger Window Malfunction | ||||
Circuit/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.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
While attempting a power window OPEN or CLOSE command, the DDM and/or PDM detects the voltage is below 9 volts or above 15.9 volts for greater than 5 seconds.
Action Taken When the DTC Sets
The power windows will be inoperative
Conditions for Clearing the DTC
| • | The DTC will be current for as long as the fault is present. |
| • | When the fault is no longer present, the DTC will be a history DTC. |
| • | A history DTC will clear after 50 ignition cycles. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Power Windows Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Battery Voltage Signal parameter while commanding the power windows to OPEN and CLOSE by using the driver window switch. The parameter should be between 9.6-13.6 volts.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate door module.
- Ignition ON, test for 9.6-13.6 volts between the B+ circuit terminal 20 and ground.
| ⇒ | If less than the specified range, test the B+ circuit for a an open/high resistance. If the circuit tests normal, replace the door module. |
| ⇒ | If the circuit tests normal and the system voltage is less than or greater than the specified range, refer to Charging System Test . |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for DDM or PDM replacement, setup, and programming
