DTC B1424 TDM
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 V, and the voltage being reported by the serial data message is greater than 9 V, 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 V. |
| • | Reported battery voltage received via serial data is valid and is greater than 9 V. |
| • | 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 9 V, 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
Connector End View Reference
Description and Operation
Immobilizer Description and Operation
Electrical Information Reference
Scan Tool Reference
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 12.6-15.5 V.
| ⇒ | 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 Ω 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 does not illuminate, test the B+ voltage 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.
DTC B1424 Coolant Heater
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 Heater Coolant Heater Control Module (HCHCM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range.
Conditions for Running the DTC
| • | The voltages supplied to the control module is between 9.5-18 V. |
| • | The ignition is ON. |
| • | The engine is running. |
Conditions for Setting the DTC
HCHCM detects a system voltage below 10.2 V for 15 seconds.
Action Taken When the DTC Sets
The control module immediately disables all outputs when an out of range voltage condition has been detected.
Conditions for Clearing the DTC
The DTC clears when the system voltage returns to a normal range.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Air Temperature Description and Operation
Electrical Information Reference
Scan Tool Reference
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
- Observe the scan tool Auxiliary Heater Control Module, System Voltage High, System Voltage Low, DTC Set This Ignition parameters will assist you to verify if the fault is present.
- Verify that DTC B1424 is set as current.
- Engine running measure and record the voltage at the battery terminals.
- Verify that the battery voltage is 12.6-15.5 V.
- Observe the scan tool Auxiliary Heater Control Module ignition signal parameter.
- The battery terminal and AHCM parameter should not differ by more than 2 V.
| ⇒ | 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 Heater Coolant Heater Control Module (HCHCM).
- Ignition OFF, test for less than 3.0 Ω between the ground circuit terminal H X2 and ground.
- Ignition ON , verify a test lamp illuminates between the B+ voltage circuit terminal A X2 and ground.
- If the circuits test normal, replace the Heater Coolant Heater Control Module.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the B+ voltage circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
