Engine Electrical TDM

DTC B1424 (TDM)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B1424

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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 9V, and the voltage being reported by the serial data message is greater than 9V, 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 9V.

* Reported battery voltage received via serial data is valid and is greater than 9V.

* The above conditions have been met for 2 seconds.

Action Taken When the DTC Sets

* Security Indicator turns ON.

* The driver information center (DIC) displays the SERVICE THEFT DETERRENT SYSTEM message.

Conditions for Clearing the DTC

* A current DTC clears when the battery voltage at the TDM is greater than 9V, or if the reported voltage by serial data is less than 9V.

* A history DTC clears after 100 ignition cycles, if no failures are reported by the diagnostic.

Reference Information

Schematic Reference

Immobilizer Schematics [1][2]Antitheft and Alarm Systems

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

Immobilizer Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Diagnostic Aids

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

Circuit/System Verification

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

If the battery voltage is not within the specified range, refer to Charging System Test Testing and Inspection.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the theft deterrent module (TDM).

2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminal 3 and ground.

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

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

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

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

Repair Instructions

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

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