Chrysler Voyager. Manual — part 216

Symptom:

B1802 POWER SUPPLY OUT OF RANGE: LOW VOLTAGE THRESH-
OLD

When Monitored and Set Condition:

B1802 POWER SUPPLY OUT OF RANGE: LOW VOLTAGE THRESHOLD

When Monitored:

With the engine running.

Set Condition:

This DTC will set if the DCHA’s power supply voltage drops below 10.0

volts for longer than 20 seconds.

POSSIBLE CAUSES

FIELD MODE TEST RUN WITH THE ENGINE OFF

VEHICLE’S BATTERY SYSTEM

VEHICLE’S CHARGING SYSTEM NOT OPERATING PROPERLY

DCHA CONTROL UNIT FAULT

FUSED B+ CIRCUIT HIGH RESISTANCE

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.
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.
Was the Field Mode Test run with the engine off?

All

Yes

→ Rerun the Field Mode Test exactly as it is described in Test 4 of

the Cabin Heater Pre-Test. If DTC B1802 resets, Go To Test #2 of
this symptom. Otherwise, perform other diagnosis and testing as
necessary.
Perform CABIN HEATER VERIFICATION TEST - VER 1.

No

→ Go To 2

291

CABIN HEATER

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 manuals 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