Dodge Sprinter. Manual - part 386

TEST

ACTION

APPLICABILITY

WARNING: NEVER OPERATE THE HEATER IN AN ENCLOSED AREA
THAT DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS
VENT THE EXHAUST WHEN OPERATING THE HEATER. FAILURE TO
FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL INJURY
OR DEATH.
WARNING: ALLOW THE HEATER ASSEMBLY TO COOL BEFORE PER-
FORMING A COMPONENT INSPECTION/REPAIR/REPLACEMENT. FAIL-
URE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL
INJURY OR DEATH.
Reconnect the Cabin Heater or Heater Booster harness connector.
Connect a suitable voltmeter to the vehicle’s battery. Position the voltmeter where it
can be monitored while operating the DRBIII

Turn the ignition on.
Set the blend control to the max heat position and the mode control to the floor
position.
Start the engine.
Allow the engine to idle.
NOTE: Do not disconnect the vehicle’s battery or the heater’s main power
supply while the heater is in operation or in run-down mode. Failure to
follow these instructions can result in excess emissions from the heater
during heater operation.
Switch the Cabin Heater or Heater Booster on. If necessary, allow the heater to run
through at least one cycle of operation (approximately 10 minutes), and then turn the
heater off.
With the DRBIII

t in Sensors, monitor the voltmeter and the Cabin Heater’s or

Heater Booster’s Operating Voltage while the heater is operational.
Switch the heater off.
Turn the engine off.
Was there more than 1.5 volts difference between Operating & battery voltage?

All

Yes

→ Repair the high resistance in the Fused B+ circuit.

Perform HEATER VERIFICATION TEST - VER 1.

→ Replace the Cabin Heater Assembly or Heater Booster Assembly

in accordance with the Service Information.
Perform HEATER VERIFICATION TEST - VER 1.

101

CABIN HEATER

UNDER VOLTAGE —

Continued

Symptom:

*NO RESPONSE FROM AIRBAG CONTROL MODULE

POSSIBLE CAUSES

CHECK POWERS AND GROUNDS TO THE AIRBAG CONTROL MODULE

K-ACM CIRCUIT SHORTED TO GROUND

K-ACM CIRCUIT SHORTED TO VOLTAGE

K-ACM CIRCUIT OPEN

AIRBAG CONTROL MODULE

TEST

ACTION

APPLICABILITY

WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING. FAILURE TO DO SO MAY
RESULT IN PERSONAL INJURY OR DEATH.
Disconnect the Airbag Control Module harness connector.
Check each power and ground circuit to the module.
Were any problems found?

All

Yes

→ Refer to the wiring diagrams located in the service information to

help isolate an open or shorted condition. Repair as necessary.
Perform __AIRBAG VERIFICATION TEST - VER 1.

→ Go To 2

WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING. FAILURE TO DO SO MAY
RESULT IN PERSONAL INJURY OR DEATH.
Disconnect the ACM harness connector.
Disconnect the DRBIII

t from the DLC.

Measure the resistance between ground and the K-ACM circuit.
Is the resistance below 5.0 ohms?

All

Yes

→ Repair the K-ACM circuit for a short to ground.

Perform __AIRBAG VERIFICATION TEST - VER 1.

→ Go To 3

WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND
WAIT TWO MINUTES BEFORE PROCEEDING. FAILURE TO DO SO MAY
RESULT IN PERSONAL INJURY OR DEATH.
Disconnect the DRBIII

t from the DLC.

Disconnect the ACM harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-ACM circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?

All

Yes

→ Repair the K-ACM circuit for a short to voltage.

Perform __AIRBAG VERIFICATION TEST - VER 1.

→ Go To 4

102

COMMUNICATION

TEST

ACTION

APPLICABILITY

t from the DLC.

Measure the resistance of the K-ACM circuit between the ACM connector and the
DLC.
Is the resistance below 5.0 ohms?

All

Yes

→ Replace the Airbag Control Module in accordance with the Service

Information.
Perform __AIRBAG VERIFICATION TEST - VER 1.

→ Repair the K-ACM circuit for an open.

Perform __AIRBAG VERIFICATION TEST - VER 1.

103

COMMUNICATION

*NO RESPONSE FROM AIRBAG CONTROL MODULE —

Continued

Symptom:

*NO RESPONSE FROM AUTOMATIC TEMPERATURE CONTROL

POSSIBLE CAUSES

CHECK POWERS AND GROUNDS TO THE AUTOMATIC TEMPERATURE CONTROL

MODULE - INTERNAL SHORT TO GROUND

K-IC, ATC, HBM, CHM CIRCUIT SHORTED TO GROUND

MODULE - INTERNAL SHORT TO VOLTAGE

K-IC, ATC, HBM, CHM CIRCUIT SHORTED TO VOLTAGE

K-IC, ATC, HBM, CHM CIRCUIT OPEN

AUTOMATIC TEMPERATURE CONTROL

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the Automatic Temperature Control harness connectors.
Check each power and ground circuit to the module.
Were any problems found?

All

Yes

→ Refer to the wiring diagrams located in the service information to

help isolate an open or shorted condition. Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.

→ Go To 2

Turn the ignition off.
Disconnect the Automatic Temperature Control harness connectors.
Disconnect the DRBIII

t from the DLC.

Measure the resistance between ground and the K-IC, ATC, HBM, CHM circuit.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 3

→ Go To 4

Turn the ignition off.
Disconnect the Automatic Temperature Control harness connectors.
Measure the resistance between ground and the K-IC, ATC, HBM, CHM circuit.
While monitoring the ohmmeter, disconnect each module (IC, HBM, CHM) one at a
time.
NOTE: The vehicle may not be equipped with all the above modules.
Is the resistance below 5.0 ohms with all the above modules disconnected?

All

Yes

→ Repair the K-IC, ATC, HBM, CHM circuit for a short to ground.

Perform BODY VERIFICATION TEST - VER 1.

→ Replace the Module, that when disconnected the short was

eliminated, in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1.

104

COMMUNICATION

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