Dodge Ram 2004, Service Manual

Page: 377 / 642

Symptom List:
A/C SWITCH FAULT (STORED)
BACKLIGHT DIMMING RX FAILURE (STORED)
BLEND OVERCURRENT (STORED)
CHECKSUM FAILURE (STORED)
DEFOG SWITCH FAULT (STORED)
ENGINE GAUGE RX FAILURE (STORED)
EVAPORATOR
TEMPERATURE SENSOR CIRCUIT OPEN
(STORED)
EVAPORATOR
TEMPERATURE SENSOR CIRCUIT SHORTED
(STORED)
LOOPBACK TEST FAILURE (STORED)
MODE 1 OVERCURRENT (STORED)
MODE 2 OVERCURRENT (STORED)
PCM COMMUNICATION FAILURE (STORED)
RECIRC OVERCURRENT (STORED)
RECIRC SWITCH FAULT (STORED)
REFRIGERANT PRESS RX FAILURE (STORED)
TX FAILURE (STORED)
VIN RX FAILURE (STORED)
ZONE OVERCURRENT (STORED)
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be A/C SWITCH FAULT (STORED).
When Monitored and Set Condition:
A/C SWITCH FAULT (STORED)
When Monitored: With the ignition on.
Set Condition: This DTC will set if the A/C on/off switch stays closed for 10 minutes.
BACKLIGHT DIMMING RX FAILURE (STORED)
When Monitored: With the ignition on.
Set Condition: If the A/C - Heater Control Module does not receive the dimming function
message from the Instrument Cluster for more than 5 seconds, then the A/C - Heater
Control Module backlighting will default to full brightness and the DTC will set.
BLEND OVERCURRENT (STORED)
When Monitored: When actuator movement is requested.
Set Condition: This DTC will set if the A/C - Heater Control Module detects an excessive
current draw on any of the door driver circuits while attempting to drive the Blend
(single-zone) or Passenger Blend (dual-zone) actuator. Only one overcurrent DTC can set
per ignition cycle.
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HEATING & A/C