B1821 Combustion Air Fan Circuit: Open; B1821 Combustion Air Fan Circuit: Short To Ground - Chrysler Town and Country 2003 Owner's Manual

CABIN HEATER
Symptom List:

B1821 COMBUSTION AIR FAN CIRCUIT: OPEN

B1821 COMBUSTION AIR FAN CIRCUIT: SHORT TO GROUND

Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be B1821 COMBUSTION AIR FAN
CIRCUIT: OPEN.
When Monitored and Set Condition:
B1821 COMBUSTION AIR FAN CIRCUIT: OPEN
When Monitored: After DCHA activation, when the system is in a steady state of
operation.
Set Condition: This DTC will set if the DCHA Control detects no-load voltage on the
Combustion Air Fan circuit output pin.
B1821 COMBUSTION AIR FAN CIRCUIT: SHORT TO GROUND
When Monitored: After DCHA activation, when the system is in a steady state of
operation.
Set Condition: This DTC will set if the DCHA Control detects a high current draw on the
Combustion Air Fan circuit output pin.
COMBUSTION AIR FAN/DCHA CONTROL UNIT FAULT
TEST
1 WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH
AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILI-
TIES. ALWAYS VENT THE DCHA's EXHAUST WHEN OPERATING THE
DCHA. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN
PERSONAL INJURY OR DEATH.
WARNING: ALLOW THE DCHA ASSEMBLY TO COOL BEFORE PERFORM-
ING A COMPONENT INSPECTION/REPAIR/REPLACEMENT. FAILURE TO
FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
CAUTION: DO NOT PERFORM THIS TEST UNLESS DIRECTED HERE BY
THE CABIN HEATER PRE-TEST. ALWAYS PERFORM THE CABIN HEATER
PRE-TEST PRIOR TO PERFORMING ANY OTHER CABIN HEATER TEST
FOR THE RESULT TO BE VALID.
NOTE: If present, diagnose and repair DTC B1801 Flame Out before diag-
nosing this DTC.
Turn the ignition off.
View repair
Repair
POSSIBLE CAUSES
ACTION
Replace the DCHA Heater Module in accordance with the Service
Information.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
308
APPLICABILITY
All