MIRROR COMPASS INOPERATIVE (REMOVE MAGNETIC FIELD). Buick Roadmaster 1992

For 1990-2009 cars

# MIRROR COMPASS INOPERATIVE (REMOVE MAGNETIC FIELD)

#### SUBJECT: MIRROR COMPASS INOPERATIVE (REPLACE MIRROR) -OR- (DEGAUSS VEHICLE)

#### VEHICLES AFFECTED: 1991-92 "B" CAR WITH RPO DD1 1991-92 OLDS BRAVADA

THIS BULLETIN IS BEING REVISED TO CANCEL THE DEGAUSSING PROCEDURE AND IMPLEMENT SUBSTITUTION OF AN AUTOMATIC DIMMING MIRROR ON 1991-92 "B".**

#### CONDITION:

--------- The compass mirror, option DDI on the B car, standard on the Oldsmobile Bravada, may become inoperative or erratic, and cannot be calibrated following normal instructions in the Owner's Manual and Service Manual.

#### CAUSE:

----- Electro-static build-up on the vehicle may interfere with the functioning of the compass. The compass feature was eliminated in production on "B" cars midway thru the 1992 model year.

#### CORRECTION:

---------- "B" Cars: To insure customer satisfaction, the compass mirror should be replaced with an Electo-Chromatic (automatic self-dimming) mirror, P/N 10232109, if the customer comments about the inoperative compass.

To replace the mirror, use the following procedure:

1. Disconnect the four-way electrical connector to the existing mirror, then remove the #15 Torx screw.

2. Remove and discard the plastic cover over the wire harness. Pull the mirror upward (toward the top of the windshield) to remove it. Discard the existing mirror.

3. Obtain the new mirror. Cut off the single wire lead. This lead supplies a signal from the park/neutral switch, which is not used in the 1991-1992 application. Install the new mirror onto the bracket, and tighten the screw snugly. Connect the four-way electrical connector.

4. Copy the attached Owner's Manual update and provide it to the owner. It will explain the operation of the automatic feature.

If the mirror needs service in the future, the 1993 Service Manual can be used. Note that the wire from the park/neutral switch is not used. Oldsmobile only, use 1993 "C-H" Service Manual.

Olds Bravada: Take the vehicle to a television repair shop, and request them to do a "Degaussing" operation.

#### Important: Remove the mirror from the vehicle before performing this operation.

Degaussing consists of passing an electrical device over the car, which will eliminate the magnetic fields. They should degauss the roof, rear of hood, A-pillars, and instrument panel. Degaussing will not affect the operation of any other components of the vehicle. Depending on the type of equipment used, it may be necessary to go over the vehicle twice to completely degauss it.

When the degaussing is complete, reinstall the mirror, then calibrate the compass following normal procedures. Check the compass for proper operation.

For vehicles repaired under warranty use:

Labour Operation: C0040

Labour Time: 0.2 Hr.

North American Export Sales (NAES) dealers reference:

Buick Division bulletin 92-9-10

Oldsmobile Division bulletin 92-T-46

Chevrolet Division bulletin 92-103-10

#### Automatic Mirror

Your car has the automatic inside mirror.

The automatic mirror adjusts for the glare of headlights behind you. It detects changes in light, and then adjusts for day or night operation.

During the day the mirror reflects all the light from behind your car. At night, when the glare is too high, it changes to the night mode. Then, it reflects only part of the light from behind you. When the mirror changes to the night mode, it holds that position until glare is no longer present.

#### Time Delay

The mirror delays before switching from the night back to the day position. This delay prevents rapid changing of the mirror as you drive under lights and through traffic.

Automatic/Off Switch -------------------- Push the switch up for the AUTO position. The switch cap will light indicating the mirror will automatically adjust for glare.

To turn the automatic adjust off, push the switch down.

#### Front Reading Lights

There are two reading lights located on the rearview mirror. Push the switch closest to the light to turn it on or off.

#### Cleaning Photocells

Use a cotton swab and glass cleaner to clean the two photocells that make the mirror work.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.