• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
B+ | B1424 | B1424 | -- | -- |
Ground | -- | B1424 | -- | -- |
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.
• | The voltages supplied to the control module is between 9.5-18 V. |
• | The ignition is ON. |
• | The engine is running. |
HCHCM detects a system voltage below 16 V for 5 seconds.
The control module immediately disables all outputs when an out of range voltage condition has been detected.
The DTC clears when the system voltage returns to a normal range.
• | A possible cause of this DTC could be overcharging with a battery charger or jump starting. |
• | A high voltage value in multiple modules indicates a concern in the charging system. |
Air Temperature Description and Operation
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If the battery voltage is not within the specified range, refer to Charging System Test |
⇒ | If greater than specified value, replace the Heater Coolant Heater Control Module. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.