TrailBlazer 4WD L6-4.2L VIN S (2002)
north and true north due to geographical location.
World Magnetic Variation Map
1. Locate your current geographic location on the World Magnetic Variation Map.
2. Turn ON the ignition, with the engine OFF.
3. Press and hold the switch for the compass, which may be depicted as COMP, COMPASS, or On/Off (W/UE1) depending on the type of mirror on
the vehicle, until a zone number appears on the compass display.
4. Depress the switch for the compass to select the desired zone number.
5. Wait 5 seconds, the display will return to a compass heading. The variance procedure is now complete.
For a description of the RPO Code(s) shown in this article/images refer to the RPO Code List found at Vehicle/Application ID. See: Application and
ID/RPO Codes
Inside Rearview Mirror
INSIDE REARVIEW MIRROR WITH THE AUTOMATIC DAY-NIGHT FEATURE SYSTEM COMPONENTS
The inside rearview mirror with the automatic day-night feature system consist of the following components:
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Inside rearview mirror
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Driver outside rearview mirror with the automatic day-night feature
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Ambient air temperature sensor
POWER AND GROUND OF THE INSIDE REARVIEW MIRROR
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With the ignition ON, ignition voltage is supplied to the mirror from the IGN E fuse in the underhood fuse block.
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Ground for the mirror is provided by G302.
INSIDE REARVIEW MIRROR WITH THE AUTOMATIC DAY-NIGHT FEATURE SYSTEM OPERATION
The inside rearview mirror uses 2 photocell sensors. 1 sensor is the headlight sensor, located on the front of the mirror or mirror face. The headlight
sensor is used to determine light conditions present at the mirror face. The other sensor is the ambient light sensor, located on the back of the mirror or
windshield side. The ambient light sensor is used to determine light conditions present at the mirror. With automatic day-night feature enable, the
mirror uses ambient light sensor to determine if the present light condition. With a low light condition detected, and a high light condition such as
headlights from a car behind is present at the headlight sensor. The inside rearview mirror will automatically darken the face of the mirror to reduce
the glare from the headlights from behind. In the daytime, the mirror is in a normal state because of the high light condition that is indicated by the
ambient light sensor. With the gear selector lever in the REVERSE position, backup lamp supply voltage is supplied as an input to the inside rearview
mirror. In night time conditions only, the mirror monitors this input to disable the automatic day-night feature which allows the face to gradually
change to a normal state. This allows the driver to see objects in the mirror clearly when backing up.
DRIVER OUTSIDE REARVIEW MIRROR WITH THE AUTOMATIC DAY-NIGHT FEATURE OPERATION
