Date: 091201
Lighting - Headlamp Moisture Fault Diagnostics
SI M 63 03 09
Lights
December 2009
Technical Service
SUBJECT
Headlamp Moisture: Fault Diagnostics
MODEL
All models
SITUATION
There is water or condensation in one or both headlamps.
INFORMATION
Under some environmental conditions, condensation can occur without there being a faulty headlamp. A comprehensive test plan that will
allow an accurate diagnosis and repair is available. Follow the relevant test plan in diagnostics, using the latest ISTA diagnosis version.
Select "Information search" and the test plan may be accessed in two ways:
1. Using the "Text search" tab, select "Search for document title" and search using the term "Headlight fogging".
2. Using the "Function structure" tab, select "Body / Mechanism, noises, optical element, leaks / Water ingress / Headlight fogged on
inside / Start search".
Note that a Diagnosis Code will be produced at the end of the test module. Be sure to include the code in the "Comments" section of the
