Removing and installing rain and light sensor G397 — VW

Removing and installing
rain and light sensor
G397
The rain and light sensor has been designed so that it can be used again. The prerequisite for the re-use is that the coupling pad is not damaged (check!) and it is not soiled.
Caution
On removal, store the
rain and light sensor
G397
in a dust-free location until reinstallation and ensure the silicone contact pad is not soiled.
Note
If a rain sensor is renewed and has to be replaced by a rain sensor with another part number, the rain sensor must be coded
Chapter
.
The rain sensors cannot be installed optionally. Determine the right sensor according to Electronic Parts Catalogue.
Removing:
Switch off ignition and all electrical loads, and pull out ignition key.
Remove interior mirror
General body repairs, interior
Rep. gr.
68
Interior mirror; Removing and installing interior mirror with rain sensor
.
Note
The rain and light sensor has a silicon layer (coupling pad) which forms the contact surface to the windscreen.
After detaching the clasp, it is important to wait at least 1 minute to allow the silicon layer to settle. This is necessary to prevent it from being damaged during removal.
Release clasp on left and right
arrows
and wait 1 minute to allow coupling pad to settle.
Lever out
rain and light sensor
G397
1
from retaining frame on windscreen, starting from the top.
Release and separate connector and remove
rain and light sensor
G397
.
Note
Until the time comes to reinstall it, store removed
rain and light sensor
G397
in a place where the coupling pad cannot be damaged or soiled from dust, etc.
Installing:
Installation is carried out in the reverse order. When installing observe the following:
Caution
Prior to installation, thoroughly clean the surface of the windscreen inside the retaining frame for
rain and light sensor
G397
. Any remains of coupling pad adhering to the windscreen must be completely removed.
The surface (coupling pad) of the
rain and light sensor
G397
must not be soiled on installation. A sensor with damaged coupling pad must be renewed.
Note
If the surface of the coupling pad on the
rain and light sensor
G397
is soiled, it may be possible to clean it by
“bonding on”
and then
“pulling off”
one or more adhesive strips.
Clean windscreen within retaining plate thoroughly; cleansing agent
General body repairs, interior
Rep. gr.
68
Interior mirror; Bonding retaining plate for interior mirror with rain sensor
.
If necessary, remove protective cap on new
rain and light detector sensor
G397
.
Reconnect connector.
Insert
rain and light sensor
G397
1
into retaining frame on front windscreen and engage clasp on both sides
arrows
audibly.
Note
Even when sensor is installed correctly, small air bubbles may first appear between windscreen and coupling pad. After approx. 10 minutes, the contact surface must be free of bubbles.
If the contact surface is not free of bubbles after 10 minutes, the rain sensor must be removed and installed anew.
Air bubbles between the windscreen and coupling pad can lead to malfunctions in the
rain and light sensor
G397
.
Install interior mirror
General body repairs, interior
Rep. gr.
68
Interior mirror; Removing and installing interior mirror with rain sensor
.
Read event memory and delete sporadic faults of the rain sensor
Vehicle diagnostic tester
.
Note
With the rain sensor disconnected, opening the door, for example, can wake up the CAN bus. The sporadic event entries in the onboard supply control unit must be deleted following repair work.
If
rain and light sensor
G397
was replaced, perform coding
Chapter
.