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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System (Service Information) >> Diagnosis and Testing >> Heating And A/C Systems >> On-Board Diagnostics >> Entering Display DTC Mode - MTC System

Entering Display DTC Mode - MTC System

To enter the MTC system's Display DTC Mode, perform the following:

Fig 1: Identifying A/C Heater Control, A/C Status Indicator, Blower Motor Control & A/C Mode Switch
GC0096049Courtesy of CHRYSLER LLC
NOTE: An active DTC 33 will prevent the control from entering diagnostic mode and performing certain diagnostic functions. It will also prevent proper A/C mode switch and status indicator function. If this occurs, refer to DTC-Based Diagnostics/HVAC - Diagnosis and Testing .
  1. Turn the ignition to the On position.
  2. Turn the blower motor control (1) to the On position.
  3. Press the A/C mode switch (2) down, turn the blower motor control to the Off position, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C switch. If there are active or stored DTCs to display, the A/C status indicator (3) will begin to flash. If there are no active or stored DTCs to display, the LEDs on the A/C-heater control (4) will turn off and the system will automatically exit the mode of operation.
  4. To manually exit Display DTC Mode, either turn the ignition off or disconnect the negative battery cable from the battery.
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