Mercedes-Benz Sprinter 2003 Manual page 113

*NO RESPONSE FROM AUTOMATIC TEMPERATURE CONTROL —
Continued
TEST
4 Turn the ignition off.
Disconnect the DRBIII 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?
Yes → Go To 5
→ Go To 6
No
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?
Yes → Repair the K-IC, ATC, HBM, CHM circuit for a short to voltage.
→ Replace the Module, that when disconnected the short was
No
6 Turn the ignition off.
Disconnect the Automatic Temperature Control harness connectors.
Disconnect the DRBIII 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?
Yes → Replace the Automatic Temperature Control in accordance with
→ Repair the K-IC, ATC, HBM, CHM circuit for an open.
No
ACTION
Perform BODY VERIFICATION TEST - VER 1.
eliminated, in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1.
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
105
COMMUNICATION
APPLICABILITY
All
All
All