ESP MERCEDES-BENZ SPRINTER 2006 Owner's Manual

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance of the K-ECM circuit between the ECM connector and the
DLC.
Is the resistance below 5.0 ohms?All
Ye s!Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No!Repair the K-ECM circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
11 3
COMMUNICATION
*NO RESPONSE FROM ENGINE CONTROL MODULE ÐContinued

Symptom:
*NO RESPONSE FROM HEATER BOOSTER MODULE
POSSIBLE CAUSES
CHECK POWERS AND GROUNDS TO THE HEATER BOOSTER 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
HEATER BOOSTER MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the Heater Booster Module harness connector.
Check each power and ground circuit to the module.
Were any problems found?All
Ye s!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 Heater Booster Module harness connector.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance between ground and the K-IC, ATC, HBM, CHM circuit.
Is the resistance below 5.0 ohms?All
Ye s!Go To 3
No!Go To 4
3 Turn the ignition off.
Disconnect the Heater Booster 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, 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
Ye s!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.
11 4
COMMUNICATION

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the DRBIIItfrom the DLC.
Disconnect the Heater Booster 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
Ye s!Go To 5
No!Go To 6
5 Turn the ignition off.
Disconnect the Heater Booster 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, 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
Ye s!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 Heater Booster Module harness connector.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance of the K-IC, ATC, HBM, CHM circuit between the HBM
connector and the DLC.
Is the resistance below 5.0 ohms?All
Ye s!Replace the Heater Booster 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.
11 5
COMMUNICATION
*NO RESPONSE FROM HEATER BOOSTER MODULE ÐContinued

Symptom:
*NO RESPONSE FROM INSTRUMENT CLUSTER
POSSIBLE CAUSES
CHECK POWERS AND GROUNDS TO THE INSTRUMENT CLUSTER
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
INSTRUMENT CLUSTER
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the Instrument Cluster harness connectors.
Check each power and ground circuit to the module.
Were any problems found?All
Ye s!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 Instrument Cluster harness connectors.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance between ground and the K-IC, ATC, HBM, CHM circuit.
Is the resistance below 5.0 ohms?All
Ye s!Go To 3
No!Go To 4
3 Turn the ignition off.
Disconnect the Instrument Cluster harness connectors.
Measure the resistance between ground and the K-IC, ATC, HBM, CHM circuit.
While monitoring the ohmmeter, disconnect each module (ATC, 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
Ye s!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.
11 6
COMMUNICATION

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the DRBIIItfrom the DLC.
Disconnect the Instrument Cluster 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
Ye s!Go To 5
No!Go To 6
5 Turn the ignition off.
Disconnect the Instrument Cluster 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 (ATC, 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
Ye s!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 Instrument Cluster harness connectors.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance of the K-IC, ATC, HBM, CHM circuit between the Instrument
Cluster connector and the DLC.
Is the resistance below 5.0 ohms?All
Ye s!Replace the Instrument Cluster 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.
11 7
COMMUNICATION
*NO RESPONSE FROM INSTRUMENT CLUSTER ÐContinued

Symptom:
*NO RESPONSE FROM RADIO
POSSIBLE CAUSES
CHECK POWERS AND GROUNDS TO THE RADIO
TRANSMISSION CONTROL MODULE
K-TCM, RADIO CIRCUIT SHORTED TO GROUND
TRANSMISSION CONTROL MODULE
K-TCM, RADIO CIRCUIT SHORTED TO VOLTAGE
K-TCM, RADIO CIRCUIT OPEN
RADIO
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the Radio harness connectors.
Check each power and ground circuit to the module.
Were any problems found?All
Ye s!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 Radio harness connectors.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance between ground and the K-TCM, RADIO circuit.
Is the resistance below 5.0 ohms?All
Ye s!Go To 3
No!Go To 4
3 Turn the ignition off.
Disconnect the TCM harness connectors.
Measure the resistance between ground and the K-TCM, RADIO circuit.
Is the resistance below 5.0 ohms?All
Ye s!Repair the K-TCM, RADIO circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the Transmission Control Module in accordance with the
service information.
Perform BODY VERIFICATION TEST - VER 1.
11 8
COMMUNICATION

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the DRBIIItfrom the DLC.
Disconnect the Radio harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-TCM, RADIO 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
Ye s!Go To 5
No!Go To 6
5 Turn the ignition off.
Disconnect the TCM harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-TCM, RADIO 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
Ye s!Repair the K-TCM, RADIO circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the Transmission Control Module in accordance with the
service information.
Perform BODY VERIFICATION TEST - VER 1.
6 Turn the ignition off.
Disconnect the Radio harness connectors.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance of the K-TCM, RADIO circuit between the Radio connector
and the DLC.
Is the resistance below 5.0 ohms?All
Ye s!Replace the Radio in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No!Repair the K-TCM, RADIO circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
11 9
COMMUNICATION
*NO RESPONSE FROM RADIO ÐContinued

Symptom:
*NO RESPONSE FROM SECURITY SYSTEM MODULE
POSSIBLE CAUSES
CHECK POWERS AND GROUNDS TO THE SECURITY SYSTEM MODULE
CENTRAL TIMER MODULE
K-CTM, SSM CIRCUIT SHORTED TO GROUND
CENTRAL TIMER MODULE
K-CTM, SSM CIRCUIT SHORTED TO VOLTAGE
K-CTM, SSM CIRCUIT OPEN
SECURITY SYSTEM MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the Security System Module harness connectors.
Check each power and ground circuit to the module.
Were any problems found?All
Ye s!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 SSM harness connectors.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance between ground and the K-CTM, SSM circuit.
Is the resistance below 5.0 ohms?All
Ye s!Go To 3
No!Go To 4
3 Turn the ignition off.
Disconnect the Central Timer Module harness connector.
Measure the resistance between ground and the K-CTM, SSM circuit.
Is the resistance below 5.0 ohms?All
Ye s!Repair the K-CTM, SSM circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the Central Timer Module in accordance with the service
information.
Perform BODY VERIFICATION TEST - VER 1.
120
COMMUNICATION

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the DRBIIItfrom the DLC.
Disconnect the SSM harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-CTM, SSM 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
Ye s!Go To 5
No!Go To 6
5 Turn the ignition off.
Disconnect the Central Timer Module harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-CTM, SSM 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
Ye s!Repair the K-CTM, SSM circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the Central Timer Module in accordance with the service
information.
Perform BODY VERIFICATION TEST - VER 1.
6 Turn the ignition off.
Disconnect the SSM harness connectors.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance of the K-CTM, SSM circuit between the SSM connector and
the DLC.
Is the resistance below 5.0 ohms?All
Ye s!Replace the Security System Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No!Repair the K-CTM, SSM circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
121
COMMUNICATION
*NO RESPONSE FROM SECURITY SYSTEM MODULE ÐContinued

Symptom:
*NO RESPONSE FROM SENTRY KEY REMOTE ENTRY MODULE
POSSIBLE CAUSES
CHECK POWERS AND GROUNDS TO THE SENTRY KEY REMOTE ENTRY MODULE
K-SKREEM CIRCUIT SHORTED TO GROUND
K-SKREEM CIRCUIT SHORTED TO VOLTAGE
K-SKREEM CIRCUIT OPEN
SENTRY KEY REMOTE ENTRY MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the SKREEM harness connector.
Check each power and ground circuit to the module.
Were any problems found?All
Ye s!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 SKREEM harness connector.
Disconnect the DRBIIItfrom the DLC.
Measure the resistance between ground and the K-SKREEM circuit.
Is the resistance below 5.0 ohms?All
Ye s!Repair the K-SKREEM circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 3
3 Turn the ignition off.
Disconnect the DRBIIItfrom the DLC.
Disconnect the SKREEM harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the K-SKREEM 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
Ye s!Repair the K-SKREEM circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 4
122
COMMUNICATION