B1424

DTC B1424

Diagnostic Instructions

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

DTC Descriptor

DTC B1424
- Device 1 Voltage Low

Diagnostic Fault Information






Circuit/System Description

The theft deterrent module (TDM) monitors the battery positive (B+) circuit. If the voltage at the TDM is between 6 and 9 volts, and the voltage being reported by the serial data message is greater than 9 volts, DTC B1424 will set.

Conditions for Running the DTC

* The Ignition is in Accessory or RUN.
* The diagnostic runs every 100 milliseconds.

Conditions for Setting the DTC

* Voltage at the B+ circuit is between 6 and 9 volts.
* Reported battery voltage received via serial data is valid and is greater than 9 volts.
* The above conditions have been met for 2 seconds.

Action Taken When the DTC Sets

* Security Indicator turns ON.
* The driver information center displays a message (DIC) if equipped.

Conditions for Clearing the DTC

* A current DTC clears when the battery voltage at the TDM is greater than 9 volts, or if the reported voltage by serial data is less than 9 volts.
* A history DTC clears after 100 ignition cycles, if no failures are reported by the diagnostic.

Diagnostic Aids

A low voltage DTC in multiple modules indicates a concern in the charging system.

Circuit/System Verification

1. Engine running measure and record the voltage at the battery terminals.
2. Verify that the battery voltage is 12.6-15.5 volts.

• If the battery voltage is not within the specified range, refer to Charging System Test Charging System Test

Circuit/System Testing

1. Verify that DTC B1424 is set as current.
2. Ignition OFF, disconnect the harness connector at the theft deterrent module (TDM).
3. Ignition OFF, test for less than 3.0 ohms between the ground circuit terminal 3 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

4. Ignition ON, verify a test lamp illuminates between the B+ voltage circuit terminal 1 and ground.

• If the test lamp did not illuminate, test the B+ voltage circuit for a short to ground or an open/high resistance.

5. If the circuits test normal, replace the TDM.

Repair Instructions

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