DTC 9 - Control Module Internal Failure

DIAGNOSTIC TROUBLE CODE 9 - CONTROL MODULE INTERNAL FAILURE
Calibration/Diagnostics, Cooldown status, and Evaporator Fin Sensor values are stored in an EEPROM (Electronically Erasable Programmable Read Only Memory) module internal to the Control Module. The Control Module microcomputer uses the information stored in the EEPROM to properly position the actuator doors, and to determine when the Cooldown Test needs to be performed.

Detection
When incorrect data is found in EEPROM, the DRB III will display the DTC.

Possible Causes
The only possible cause for DTC 9 is incorrect data within the EEPROM. When this DTC is indicated, the Control Module must be replaced.

Test Procedures
1. Replace the HVAC control module.
2. Once repairs are completed repeat the Calibration Diagnostic and Cooldown test. Repeating the test is necessary to clear the fault codes.