Chrysler Town, Dodge Caravan. Manual — part 764
TEST
ACTION
APPLICABILITY
2
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.
Turn the ignition off.
Inspect the vehicle’s battery terminals, cable terminals, and cables for corrosion and
damage in accordance with the Service Information.
Test the vehicle’s battery in accordance with the Service Information.
Is the vehicle’s battery system Ok?
All
Yes
→ Go To 3
No
→ Clean/repair the vehicle’s battery system in accordance with the
Service Information.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
3
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.
Check the vehicle’s charging system for proper operation in accordance with the
Service Information.
Is the vehicle’s charging system operating properly?
All
Yes
→ Go To 4
No
→ Repair the vehicle’s charging system in accordance with the
Service Information.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
4
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.
Turn the ignition on.
With the DRBIII
t in Sensors, record the DCHA Operating Voltage.
Disconnect the Cabin Heater Assist C1 harness connector.
Measure the voltage between the Fused B+ circuit and ground.
Is there more than 1.0 volt difference between the Operating Voltage and the Fused
B+ voltage?
All
Yes
→ Replace the DCHA Heater Module in accordance with the Service
Information.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
No
→ Go To 5
292
CABIN HEATER
B1802 POWER SUPPLY OUT OF RANGE: LOW VOLTAGE THRESHOLD —
Continued
TEST
ACTION
APPLICABILITY
5
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.
Make sure that the Cabin Heater Assist C1 harness connector is connected to the
DCHA.
Connect a suitable voltmeter to the vehicle’s battery. Position the voltmeter where it
can be monitored while operating the DRBIII
t.
Turn the ignition on.
On MTC, set the Blend control to the max cool position.
On ATC, set the Driver temperature control to LO (max cool).
Turn the ATC’s or MTC’s Power switch off.
Start the engine.
Allow the engine to idle.
Turn the ATC’s or MTC’s Power switch on.
Turn the Blower control to the high speed position.
CAUTION: Do not activate the DCHA Field Mode Test with the engine off.
Failure to follow these instructions may result in internal damage to the
DCHA Heater Module.
NOTE: Do not disconnect the vehicle’s battery or the DCHA’s main power
supply while the DCHA is in operation or in run-down mode. Failure to
follow these instructions may result in excess emissions from the DCHA
during heater operation.
With the DRBIII
t in Cabin Heater, Systems Tests, select Field Mode and press Enter.
The test will run for approx 8.5 minutes.
On MTC, set the Blend control to the max heat position.
On ATC, set the Driver temperature control to HI (max heat).
With the DRBIII
t in Sensors, monitor the DCHA Operating Voltage and the
voltmeter while the Field Mode Test is running. Upon completion of the Field Mode
Test proceed as follows:
Turn the Blower control off and turn the ATC’s or MTC’s Power switch off.
Turn the engine off.
Was there more than 1.5 volts difference between Operating & battery voltage during
the test?
All
Yes
→ Repair the high resistance in the Fused B+ circuit.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
No
→ Replace the DCHA Heater Module in accordance with the Service
Information.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
293
CABIN HEATER
B1802 POWER SUPPLY OUT OF RANGE: LOW VOLTAGE THRESHOLD —
Continued
Symptom:
B1802 POWER SUPPLY OUT OF RANGE: VOLTAGE ABOVE 15.5
VOLTS
When Monitored and Set Condition:
B1802 POWER SUPPLY OUT OF RANGE: VOLTAGE ABOVE 15.5 VOLTS
When Monitored:
With the engine running.
Set Condition:
This DTC will set if the DCHA’s power supply voltage exceeds 15.5 volts
for longer than six seconds.
POSSIBLE CAUSES
VEHICLE’S CHARGING SYSTEM OVERCHARGING
DCHA CONTROL UNIT FAULT
TEST
ACTION
APPLICABILITY
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.
Check the vehicle’s charging system for proper operation in accordance with the
Service Information.
Is the vehicle’s charging system operating properly?
All
Yes
→ Replace the DCHA Heater Module in accordance with the Service
Information.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
No
→ Repair the vehicle’s charging system in accordance with the
Service Information.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
294
CABIN HEATER
Symptom:
B1803 FLAME DETECTED PRIOR TO COMBUSTION
When Monitored and Set Condition:
B1803 FLAME DETECTED PRIOR TO COMBUSTION
When Monitored:
During DCHA start up.
Set Condition:
This DTC will set if the Flame Sensor resistance is not within the expected
parameters.
POSSIBLE CAUSES
FLAME SENSOR FAULT
TEST
ACTION
APPLICABILITY
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.
Turn the ignition off.
View repair
All
Repair
Replace the DCHA Heater Module in accordance with the Service
Information.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
295
CABIN HEATER
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