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

Circuit/System Description

Voltage at theft deterrent module (TDM) is lower than the voltage being reported on the serial data line.

Conditions for Running the DTC

The ignition must be in Accessory or Run mode for this code to set.

Conditions for Setting the DTC

Voltage at the TDM B+ circuit is between 6-9 volts and the reported battery voltage received via serial data is greater than 9 volts.

Action Taken When the DTC Sets

Security Indicator ON.

Conditions for Clearing the DTC

Module battery voltage is greater than 9 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the TDM.
2. Measure and record the voltage at the battery terminals. Ignition ON, measure the voltage between the accessory voltage circuit terminal 2 and the ground circuit terminal 3. Verify that the voltage readings do not differ more than 1 volt.

• If greater than 1 volt, test the accessory voltage circuit and the ground circuit for an open/high resistance. If the circuits test normal, replace the TDM.

3. Refer to Charging System Test. Charging System Test

Repair Instructions

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

Control Module References for TDM replacement, set up, and programming