Cabin Heater; Heater Pre-Test - Mercedes-Benz Sprinter 2003 Manual

Symptom:
A. HEATER PRE-TEST
NO RESPONSE FROM CABIN HEATER MODULE OR HEATER BOOSTER MODULE
CABIN HEATER MODULE OR HEATER BOOSTER MODULE DTC(S) PRESENT
AUTOMATIC TEMPERATURE CONTROL DTC(S) PRESENT
HEATER SYSTEM COMPONENTS
TEST
1 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.
Turn the ignition off and either allow the engine coolant to cool down to at least 50°C
(122°F) or cold soak the engine.
CAUTION: When using a powered exhaust ventilation system, do not attach
the exhaust ventilation hose directly to the heater's exhaust pipe. Too much
suction can prevent heater operation.
When using a powered exhaust ventilation system, affix the ventilation hose to the
heater's exhaust pipe or to the vehicle in such a manor that the end of the ventilation
hose remains approximately three inches away from the end of the exhaust pipe.
When using a non-powered exhaust ventilation system, affix the ventilation hose
directly to the heater's exhaust pipe.
Turn the ignition on.
With the DRBIII , attempt to communicate with the Cabin Heater Module or Heater
Booster Module and the Automatic Temperature Control Module.
Does the DRBIII display: NO RESPONSE?
Yes → Refer to the Communication Category for the related symptom.
→ Go To 2
No
POSSIBLE CAUSES
ACTION
Perform HEATER VERIFICATION TEST - VER 1.
69

CABIN HEATER

APPLICABILITY
All