Dodge Sprinter. Manual — part 387
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the DRBIII
t from the DLC.
Disconnect the Automatic Temperature Control harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-IC, ATC, HBM, CHM
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
→ Go To 5
No
→ Go To 6
5
Turn the ignition off.
Disconnect the Automatic Temperature Control harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-IC, ATC, HBM, CHM
circuit.
While monitoring the test light, disconnect each module (IC, HBM, CHM) one at a
time.
NOTE: The vehicle may not be equipped with all the above modules.
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 with all the above modules disconnected?
All
Yes
→ Repair the K-IC, ATC, HBM, CHM circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Module, that when disconnected the short was
eliminated, in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Disconnect the Automatic Temperature Control harness connectors.
Disconnect the DRBIII
t from the DLC.
Measure the resistance of the K-IC, ATC, HBM, CHM circuit between the ATC
connector and the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Automatic Temperature Control in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the K-IC, ATC, HBM, CHM circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
105
COMMUNICATION
*NO RESPONSE FROM AUTOMATIC TEMPERATURE CONTROL —
Continued
Symptom:
*NO RESPONSE FROM CABIN HEATER MODULE
POSSIBLE CAUSES
CHECK POWERS AND GROUNDS TO THE CABIN HEATER MODULE
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
CABIN HEATER MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Cabin Heater 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 BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the Cabin Heater Module harness connector.
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
No
→ Go To 4
3
Turn the ignition off.
Disconnect the Cabin Heater Module harness connector.
Measure the resistance between ground and the K-IC, ATC, HBM, CHM circuit.
While monitoring the ohmmeter, disconnect each module (IC, ATC, HBM) 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.
No
→ Replace the Module, that when disconnected the short was
eliminated, in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1.
106
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the DRBIII
t from the DLC.
Disconnect the Cabin Heater Module harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-IC, ATC, HBM, CHM
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
→ Go To 5
No
→ Go To 6
5
Turn the ignition off.
Disconnect the Cabin Heater Module harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-IC, ATC, HBM, CHM
circuit.
While monitoring the test light, disconnect each module (IC, ATC, HBM) one at a
time.
NOTE: The vehicle may not be equipped with all the above modules.
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 with all the above modules disconnected?
All
Yes
→ Repair the K-IC, ATC, HBM, CHM circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Module, that when disconnected the short was
eliminated, in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Disconnect the Cabin Heater Module harness connector.
Disconnect the DRBIII
t from the DLC.
Measure the resistance of the K-IC, ATC, HBM, CHM circuit between the CHM
connector and the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Cabin Heater Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the K-IC, ATC, HBM, CHM circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
107
COMMUNICATION
*NO RESPONSE FROM CABIN HEATER MODULE —
Continued
Symptom:
*NO RESPONSE FROM CENTRAL TIMER MODULE
POSSIBLE CAUSES
CHECK POWERS AND GROUNDS TO THE CENTRAL TIMER MODULE
SECURITY SYSTEM MODULE
K-CTM, SSM CIRCUIT SHORTED TO GROUND
SECURITY SYSTEM MODULE
K-CTM, SSM CIRCUIT SHORTED TO VOLTAGE
K-CTM, SSM CIRCUIT OPEN
CENTRAL TIMER MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Central Timer Module 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.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the CTM harness connectors.
Disconnect the DRBIII
t from the DLC.
Measure the resistance between ground and the K-CTM, SSM circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 3
No
→ Go To 4
3
Turn the ignition off.
Disconnect the Security System Module harness connector.
Measure the resistance between ground and the K-CTM, SSM circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the K-CTM, SSM circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Security System Module in accordance with the
service information.
Perform BODY VERIFICATION TEST - VER 1.
108
COMMUNICATION
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