Over Voltage - Mercedes-Benz Sprinter 2003 Manual

CABIN HEATER
Symptom:

OVER VOLTAGE

When Monitored and Set Condition:
OVER VOLTAGE
When Monitored: With the engine running.
Set Condition: This DTC will set if the heater's power supply exceed 15.9 volts for longer
than 20 seconds.
VEHICLE'S CHARGING SYSTEM OVERCHARGING
CABIN HEATER OR HEATER BOOSTER CONTROL UNIT
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.
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.
CAUTION: DO NOT PERFORM THIS TEST UNLESS DIRECTED HERE BY THE
HEATER PRE-TEST. ALWAYS PERFORM THE HEATER PRE-TEST PRIOR TO
PERFORMING ANY OTHER TEST FOR THE RESULT TO BE VALID.
Check the vehicle's charging system for proper operation in accordance with the
Service Information.
Is the vehicle's charging system operating properly?
Yes → Replace the Cabin Heater Assembly or Heater Booster Assembly
→ Repair the vehicle's charging system in accordance with the
No
POSSIBLE CAUSES
ACTION
in accordance with the Service Information.
Perform HEATER VERIFICATION TEST - VER 1.
Service Information.
Perform HEATER VERIFICATION TEST - VER 1.
96
APPLICABILITY
All