Vehicle Access

DTC B1420

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.

DTC Descriptor
DTC B1420
- Device Voltage

Circuit/System Description

The power sliding door control module (PSDM) monitors battery voltage through the battery positive voltage circuit.

Conditions for Running the DTC

Battery voltage must be less than 9 volts or greater than 15.9 volts.

Conditions for Setting the DTC

* The PSDM detects a power sliding door (PSD) system voltage below 9 volts or above 15.9 volts.
* The conditions above must be present for more than 5 seconds

Action Taken When the DTC Sets

* The power sliding doors will not operate.
* The PSDM sets a DTC B1420.

Conditions for Clearing the DTC

* This DTC will change from current to history when the fault is no longer present.
* The technician issues a scan tool CLEAR DTCs command.

Reference Information
Schematic Reference

Sliding Door Schematics (Sliding Door Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Power Sliding Door (PSD) Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for Scan Tool Information

Circuit/System Verification

Ignition ON, command the appropriate power sliding door to OPEN and CLOSE by pressing the power sliding door switch located on the overhead console switchbank while observing the voltage parameter with a scan tool. The Battery Voltage Signal parameter should be between 9.6-13.6 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector X1 at the appropriate PSDM.
2. Ignition ON, test for 9.6-13.6 volts on B+ circuit terminal 6 and ground.

• If less than the specified range, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the PSD fuse is open, test the B+ circuit for a short to ground. If the circuit tests normal, replace the appropriate PSDM.
• If the circuit tests normal and the system voltage is less than or greater than the specified range, Refer to Charging System Test (Charging System Test).

3. Ignition ON, test for 9.6-13.6 volts on B+ circuit terminal 14 and ground.

• If less than the specified range, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the PSD fuse is open, test the B+ circuit for a short to ground. If the circuit tests normal, replace the appropriate PSDM.
• If the circuit tests normal and the system voltage is less than or greater than the specified range, Refer to Charging System Test (Charging System Test).

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.