IK0800478

IK0800478 ­ Headlight Condensation or Frost
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IK0800478
Availability:
ISIS, FleetISIS
Revision:
3
Major System: ELECTRICAL SYSTEM
Created:
2/11/2014
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English
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4/10/2014
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Author:
Patrick
Gotschall
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Title : Headlight Condensation or Frost
Applies To : All composite headlights (excludes sealed beam headlights such as on
WorkStar, Paystar and 9900i)
CHANGE LOG
Article was released with no Visibility coding. Added ISIS and Fleet ISIS.
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DESCRIPTION
Condensation, fog, or moisture inside the lens of a headlight is common and expected under certain
environmental conditions. This article describes how to determine whether the symptom is normal, or if further
action is necessary.
SYMPTOM(s)
Customer Complaint(s):
- Frost, fog, or condensation is visible within the lens of a headlight.
­ The condition does not clear on its own
INSPECTION STEPS
Pre-Inspection:
1. Describe the environmental conditions present just before or during the observed symptoms
a) Temperature
b) Humidity
c) Preciptiation
Inspection:
1. Observe whether or not condensation is currently visible
2. Look for cracks on lens
3. Check for loose electrical connection
DIAGNOSTIC STEPS
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IK0800478 ­ Headlight Condensation or Frost
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Condensation is a normal and expected condition that should usually clear itself within one hour. In conditions
such as very high humidity, heavy precipitation, or extreme cold, the clearing time can be much longer. In
extended periods of extreme weather, if the vehicle remains outside, the condition may not clear until the
extreme weather subsides.
Diagnostics beyond general inspection are not recommended, and lights should NOT be replaced, unless
the condensation has failed to clear or nearly clear under one of the following conditions:
1. Customer has driven the vehicle for at least one hour in dry weather conditions, with temperatures above
freezing.
OR
2. Vehicle has first been allowed to reach room temperature in a dry environment such as a garage,
and then parked for at least one additional hour. This process could take longer if the vehicle has been cold
soaked in extreme cold conditions.
RESOLUTION
If the moisture clears under the conditions outlined under Diagnostic Steps, no action should be taken as the
headlights are performing as intended.
If the moisture does not clear OR if there is dirt and/or puddles of water (more than just water droplets on the
lens itself) then the source of the intrusion should be identified. Check the bulb connectors/covers and
ensure they are sealing properly. If they are not, reinstall and recheck. If this does not resolve or if the
connectors/covers look appear to be damaged/defective, replace the offending component(s) as replacing the
entire housing would be considered an over-repair. If the connectors/covers are sealing properly, then check
for a crack in the lens or a compromise in any of the joints of the headlight housing itself. If the housing is found
to be defective, it should be replaced. Note: Damage due to external/physical damage are not considered
warranty.
ADDITIONAL RESOURCES
For headlight removal/installation or adjustment, refer to the Truck Master Service Manual corresponding to
your truck model.
For headlight diagnostic codes or troubleshooting, refer to Electrical System Troubleshooting Guide
corresponding to your truck model.
For circuit diagrams, refer to Electrical Circuit Diagrams corresponding to your truck model.
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