For 1990-2009 cars only
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 B1424: Device 1 Voltage LowDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | B1424 00 |
B1424 00 | -- | -- |
Ground | -- | B1424 00 | -- | -- |
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.
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.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Immobilizer Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Engine running measure and record the voltage at the battery terminals.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 |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the theft deterrent module (TDM).
- 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.
- Ignition ON , verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
- If the circuits test normal, replace the TDM.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp did not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for TDM replacement, set up, and programming.
