Mirror System: Other Chevrolet Silverado 2500 HD

Outside Rearview Mirror - Passenger (-AN3/DL3)

Outside Rearview Mirror - Passenger (-AN3/DL3) Connector Parts Information

Outside Rearview Mirror - Passenger (-AN3/DL3) Connector Terminal Identification

Scheme 13

Outside Rearview Mirror Switch (-AN3/DL3) Connector Parts Information

Outside Rearview Mirror Switch (-AN3/DL3) Connector Terminal Identification

Circuit/System Verification

Command the left and right outside mirror to move up, down, left and right using the mirror directional switch. The mirror should move in the commanded direction.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Outside Rearview Mirror Motor Replacement»(ref-278022-S32809553622008012100000)
2. «Control Module References»(ref-278020-S09054666032008012100000) for DDS or PDS replacement, setup, and programming

Ignition ON, observe the scan tool Mirror Horizontal Position and Mirror Vertical Position parameters. The reading should be between 0.2-4.8 volts and change as the mirror is moved, left, right, up, and down.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Outside Rearview Mirror Motor Replacement»(ref-278022-S32809553622008012100000)
2. «Control Module References»(ref-278020-S09054666032008012100000) for DDS or PDS replacement, setup, and programming

Ignition ON, press the rear window defogger switch. The rear window defogger and both heated mirrors should become warm.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Outside Rearview Mirror Glass Replacement»(ref-278022-S06021707182008012100000)
2. «Control Module References»(ref-278020-S09054666032008012100000) for DDS or PDS replacement, setup and programming

Reference Information

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Mirror Connector End Views

Description and Operation

Outside Mirror Description and Operation (with RPO DL3) or Outside Mirror Description and Operation (without RPO DL3)

Electrical Information Reference

1. «Circuit Testing»(ref-278019-S01379251932008012100000)
2. «Connector Repairs»(ref-278019-S06982211772008012100000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-278019-S21810776732008012100000)
4. «Wiring Repairs»(ref-278019-S25320832652008012100000)

Ignition ON, using the folding mirror switch, the left and right rearview mirrors should extend and retract as commanded.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Outside Rearview Mirror Motor Replacement»(ref-278022-S32809553622008012100000)
2. «Control Module References»(ref-278020-S09054666032008012100000) for DDS or PDS replacement, setup, and programming

Symptoms - Mirrors

1. Perform the «Diagnostic System Check - Vehicle»(ref-278018-S19353494792008012100000) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following system descriptions: «Outside Mirror Description and Operation (with RPO DL3)»(ref-278022-S42739844582008012100000) «Outside Mirror Description and Operation (without RPO DL3)»(ref-278022-S09701841762008012100000) «Automatic Day-Night Mirror Description and Operation»(ref-278022-S33115687882008012100000)

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Mirror Connector End Views

Description and Operation

Outside Mirror Description and Operation (with RPO DL3) or Outside Mirror Description and Operation (without RPO DL3)

Electrical Information Reference

1. «Circuit Testing»(ref-278019-S01379251932008012100000)
2. «Connector Repairs»(ref-278019-S06982211772008012100000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-278019-S21810776732008012100000)
4. «Wiring Repairs»(ref-278019-S25320832652008012100000)

1. Ignition ON, press the rear window defogger switch. Verify the rear window defogger indicator illuminates. If the rear window defogger indicator does not illuminate, refer to «Rear Window Defogger Inoperative»(ref-278004-S41150529252008012100000) .
2. Rear window defogger ON, verify both the left and right outside mirror glass become warm.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Outside Rearview Mirror Glass Replacement»(ref-278022-S06021707182008012100000)
2. «Control Module References»(ref-278020-S09054666032008012100000) for DDS or PDS replacement, setup and programming

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Mirror Connector End Views

Description and Operation

Outside Mirror Description and Operation (with RPO DL3) or Outside Mirror Description and Operation (without RPO DL3)

Electrical Information Reference

1. «Circuit Testing»(ref-278019-S01379251932008012100000)
2. «Connector Repairs»(ref-278019-S06982211772008012100000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-278019-S21810776732008012100000)
4. «Wiring Repairs»(ref-278019-S25320832652008012100000)

1. Ignition ON, press the rear window defogger switch. Verify the rear window defogger turns ON and the rear window becomes warm. If the rear window defogger does not turn on, refer to «Rear Window Defogger Inoperative»(ref-278004-S41150529252008012100000) .
2. Press the rear window defogger switch. Verify both the left and right outside mirror glass become warm.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Outside Rearview Mirror Glass Replacement

Schematic Reference

1. «Inside Rearview Mirror Schematics»(ref-278022-S42736725192008012100000)
2. «Outside Rearview Mirror Schematics»(ref-278022-S06399978122008012100000)

Connector End View Reference

Mirror Connector End Views

Description and Operation

Automatic Day-Night Mirror Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-278019-S01379251932008012100000)
2. «Wiper/Washer Schematics»(ref-278010-S07504517192008012100000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-278019-S21810776732008012100000)
4. «Wiring Repairs»(ref-278019-S25320832652008012100000)

1. Ignition ON, headlamps ON, vehicle in PARK, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor while observing the inside rearview mirror face. The inside rearview mirror face should dim. If the mirror face does not dim, test or replace the inside rearview mirror.
2. Headlamps ON, park brake applied, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor while observing the inside rearview mirror face. Place the transmission in REVERSE. The inside rearview mirror face should transition from dim to bright. If the mirror does not transition from dim to bright, refer to «Reverse Input Malfunction»(ref-278022-S15551304092008012100000) .
3. Headlamps ON, vehicle in PARK, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor while observing the left outside rearview mirror face. The left outside rearview mirror face should dim. If the left outside rearview mirror face does not dim, refer to «Outside Rearview Mirror Dimming Malfunction»(ref-278022-S15551304092008012100000) .
4. Remove the towel from the inside rearview mirror and remove the flashlight. Verify the inside rearview mirror face returns to its normal bright state. If the mirror face does not return to its normal state, test or replace the inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Inside Rearview Mirror Replacement»(ref-278022-S14377066282008012100000)
2. «Outside Rearview Mirror Glass Replacement»(ref-278022-S06021707182008012100000)

Schematic Reference

1. «Inside Rearview Mirror Schematics»(ref-278022-S42736725192008012100000)
2. «Outside Rearview Mirror Schematics»(ref-278022-S06399978122008012100000)

Connector End View Reference

Mirror Connector End Views

Description and Operation

Automatic Day-Night Mirror Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-278019-S01379251932008012100000)
2. «Wiper/Washer Schematics»(ref-278010-S07504517192008012100000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-278019-S21810776732008012100000)
4. «Wiring Repairs»(ref-278019-S25320832652008012100000)

1. Ignition ON, headlamps ON, vehicle in PARK, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor while observing the inside rearview mirror face. The inside rearview mirror face should dim. If the mirror face does not dim, test or replace the inside rearview mirror.
2. Headlamps ON, park brake applied, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor while observing the inside rearview mirror face. Place the transmission in REVERSE. The inside rearview mirror face should transition from dim to bright. If the mirror does not transition from dim to bright, refer to «Reverse Input Malfunction»(ref-278022-S22799435832008012100000) .
3. Remove the towel from the inside rearview mirror and remove the flashlight. Verify the inside rearview mirror face returns to its normal bright state. If the mirror face does not return to its normal state, test or replace the inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Inside Rearview Mirror Replacement

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Mirror Connector End Views

Description and Operation

Outside Mirror Description and Operation (with RPO DL3) or Outside Mirror Description and Operation (without RPO DL3)

Electrical Information Reference

1. «Circuit Testing»(ref-278019-S01379251932008012100000)
2. «Connector Repairs»(ref-278019-S06982211772008012100000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-278019-S21810776732008012100000)
4. «Wiring Repairs»(ref-278019-S25320832652008012100000)

1. Ignition ON, observe the scan tool Mirror Fold Switch parameter while cycling the mirror fold switch between the extend and retract positions. The parameter should change between Idle, Extend, and Retract. If the parameter does not cycle between the specified values, replace the DDS.
2. Command the power folding mirrors to extend and retract using the mirror fold switch. Both mirrors should extend and retract as commanded.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Outside Rearview Mirror Motor Replacement»(ref-278022-S32809553622008012100000)
2. «Control Module References»(ref-278020-S09054666032008012100000) for DDS or PDS replacement, setup, and programming

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Mirror Connector End Views

Description and Operation

Outside Mirror Description and Operation (with RPO DL3) or Outside Mirror Description and Operation (without RPO DL3)

Electrical Information Reference

1. «Circuit Testing»(ref-278019-S01379251932008012100000)
2. «Connector Repairs»(ref-278019-S06982211772008012100000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-278019-S21810776732008012100000)
4. «Wiring Repairs»(ref-278019-S25320832652008012100000)

1. Ignition ON, observe the scan tool Mirror Select Switch parameter while cycling the mirror select switch between the left and right positions. The parameter should change between Idle, Left, and Right. If the parameter does not cycle between the specified values, replace the DDS.
2. Observe the scan tool Mirror Motor parameter while cycling the mirror directional switch between the up, down, left and right positions. The parameter should change between Idle, Up, Down, Left, and Right. If the parameter does not cycle between the specified values, replace the DDS.
3. Verify the vehicle is equipped with RPO DL3/DR4. If the vehicle is not equipped with RPO DL3/DR4, refer to «Mirror Motor Circuit Malfunction»(ref-278022-S24522010242008012100000)
4. Observe the scan tool Mirror Horizontal Position and Mirror Vertical Position parameters. The reading should be between 0.2 volt and 4.8 volts and change as the mirror is moved, left, right, up, and down. If not within the specified range or the parameter does not change as the mirror is moved, refer to «Mirror Position Sensor Circuit Malfunction»(ref-278022-S24522010242008012100000) .
5. Command the left and right outside mirror to move up, down, left and right using the mirror directional switch. The mirrors should move in the commanded direction. If either mirror does not move in all commanded directions, refer to «Mirror Motor Circuit Malfunction»(ref-278022-S24522010242008012100000) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Outside Rearview Mirror Motor Replacement»(ref-278022-S32809553622008012100000)
2. «Control Module References»(ref-278020-S09054666032008012100000) for DDS or PDS replacement, setup, and programming

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Mirror Connector End Views

Description and Operation

Outside Mirror Description and Operation (with RPO DL3) or Outside Mirror Description and Operation (without RPO DL3)

Electrical Information Reference

1. «Circuit Testing»(ref-278019-S01379251932008012100000)
2. «Connector Repairs»(ref-278019-S06982211772008012100000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-278019-S21810776732008012100000)
4. «Wiring Repairs»(ref-278019-S25320832652008012100000)

1. Ignition ON, with the mirror selector switch in the DRIVER position, command the mirrors UP, DOWN, LEFT, and RIGHT using the mirror directional switch. The driver mirror should move in the commanded direction.
2. With the mirror selector switch in the PASSENGER position, command the mirrors UP, DOWN, LEFT, and RIGHT using the mirror directional switch. The passenger mirror should move in the commanded direction.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Outside Rearview Mirror Motor Replacement

Scheme 14

Power Mirror Switch Replacement (with DL8 and without SLT)

Scheme 15

Power Mirror Replacement

Scheme 16

Outside Rearview Mirror Motor Replacement

Tools Required

Safety Razor or Utility Knife

Scheme 17

1. Determine the location of the mirror mounting base by marking the outside of the windshield with a marking pencil where the base was previously located. If it is not clear where the base was mounted, use the following steps to determine where the base should be installed: Using a measuring tape, measure the distance between the windshield pillars from the base of the shade line . Using a marking pencil, halfway between the windshield pillars, draw a centerline (1) on the windshield from the roof panel to the windshield base. Draw a perpendicular line intersecting the centerline (2) at that location. The top center of the mirror mounting base will be at the intersection of these lines.
2. Scrape the inside windshield thoroughly with a safety razor or utility knife in order to remove all old adhesive.
3. If reinstalling the original mounting base, place the mirror mounting base in a suitable holding device, such as a vise.
4. Clean the mirror mounting base thoroughly with a safety razor or utility knife in order to remove all old adhesive.
5. Clean the inside windshield and the mounting surface of the mirror mounting base thoroughly with a clean cloth saturated with naphtha or a 50/50 mixture (by volume) of clean water and isopropyl alcohol.
6. Use Inside Mirror Adhesive Kit GM P/N 89021329 (Canadian P/N 993362), or equivalent, to apply a small amount of activator to the mounting surface of the mirror mounting base.
7. Apply a small amount of activator to the windshield where the mounting base is to be installed.
8. Allow the activator to dry 5 minutes.
9. Apply 1 drop of adhesive to the center of the mirror mounting base.
10. Immediately apply the mounting base to the windshield, ensuring that the mounting base aligns correctly to the marks made on the outside of the windshield.
11. Hold the mounting base firmly in place for 1 minute.
12. Allow the adhesive to set for 15 minutes.
13. Install the mirror to the mirror mounting base and fasten, if necessary.
14. Connect the electrical connector and install the wire cover, if equipped.

The power mirror system consists of the following components

1. Driver Door Switch (DDS)-An electronic control module with integrated switches and requires programming when replaced
2. Passenger Door Switch (PDS)-An electronic control module with integrated switches, requires programming when replaced
3. Power Mirror Direction Switch-Integrated into DDS and is a four position momentary switch that provides a signal input to the DDS for up, down, left/extend and right/retract with a mirror switch activation
4. Mirror Select Switch-Integrated into DDS and is a three position switch that allows the operator to select the left or right mirror and also a neutral/fold position
5. Mirror Extend/Retract Switch-Integrated into DDS and is a two position switch that allows the operator to select the mirror extend or mirror retract position
6. Left Outside Power Mirror-Contains both the vertical and horizontal mirror motors
7. Right Outside Power Mirror-Contains both the vertical and horizontal mirror motors
8. Body Control Module-An electronic control module that requires programming when replaced, serves as the power mode master and is the main message handler
9. Horizontal and Vertical Position Sensors, if equipped with memory mirrors-Supplied a 5-volt and low reference by the DDS/PDS and provide a variable voltage signal to the DDS/PDS that is proportional to mirror position
10. Folding Mirror Motor, in each of the outside mirrors, if equipped with power fold mirrors-Provides extend and retract movements of the mirror and is serviced as a complete mirror assembly

Each of the outside power mirrors contains 2 reversible motors to provide horizontal and vertical movement of the mirror glass. The vertical motor operates the up and down directions and the horizontal motor operates the left and right directions. If equipped with power folding mirrors, each outside power mirror will contain a reversible fold motor to operate the extend and retract functions. Each of the mirror motors are circuit breaker protected.

The power mirror switch incorporates a 3-position mirror select switch, and a 4-position mirror direction switch. The mirror select switch allows the operator to select the mirror to be moved by selecting the L position for the left power mirror, selecting the R position for the right power mirror or the center which is the neutral position. The mirror direction switch is a 4-position switch that allows the operator to move the selected mirror up, down, left or right.

The power mirror switch is integrated into the DDS. The left and right mirror positions of the select switch and 4 positions of the direction switch, when active, will provide a signal to the DDS. If the selector switch is placed in the L position and the up switch is depressed, 2 signals will be supplied to the DDS. The DDS upon receipt of these signals will provide battery voltage to the mirror motor left/up control circuit and ground to the mirror motor down control circuit and the mirror will move up. The remainder of the driver mirror functions operate in the same manner as described above except the DDS will supply battery voltage and ground to the appropriate control circuits for the direction selected. If the passenger mirror is selected and a direction switch is activated, the DDS sends a LAN message to the PDS indicating that the passenger mirror was selected and the direction to be commanded. The PDS will then supply battery voltage and ground to the appropriate control circuits for the direction selected.

The folding mirror switch is integrated into the DDS and incorporates a 2-position mirror extend/retract switch. The mirror extend/retract switch allows the operator to extend or retract the power folding mirrors.

Upon receipt of the required switch input, the DDS will supply battery voltage and ground to the mirror extend/retract motor control circuits to perform the requested extend or retract function. The DDS will also send a LAN message to the PDS indicating the requested function. The PDS will supply battery voltage and ground to the mirror extend/retract motor control circuits to perform the requested extend or retract function.

Heated Outside Rearview Mirror

The DDS and PDS control the activation of the mirror heaters. Upon receiving a serial data message indicating a request for heated mirrors, the DDS and PDS, will apply voltage to the mirror heater element supply voltage circuit. The mirror heaters will remain active until a new message is received indicating rear defogger is to be deactivated.

The power mirror system consists of the following components

1. Outside rearview mirror switch
2. Mirror selector switch
3. Left outside rearview mirror
4. Right outside rearview mirror

Each of the outside rearview mirror contains two motors. The vertical motor operates the mirror in the up and down directions, and the horizontal motor operates the mirror in the left and right directions.

The outside rearview mirror switch is a four position directional switch: Up, Down, Left and Right.

The mirror select switch is a three position switch: left, center/neutral, and right.

The outside rearview mirror switch receives power through the battery positive voltage circuit from the PWR MIR fuse. The power mirror switch also receives a constant ground.

The four positions of the direction switch have dual switch contacts. Each of the contacts are connected to opposing sides of the appropriate power mirror motors through the selector switch. The selector switch completes these circuits depending on the position of the selector switch, L or R.

If the selector switch is placed in the L position and the up switch is depressed, battery positive voltage will be supplied to the left outside rearview mirror vertical motor through the left mirror motor down control circuit and ground through the left mirror motor left control circuit. If the down switch is depressed, battery positive voltage will be supplied to the left outside rearview mirror vertical motor through the left mirror motor left control circuit and ground through the left mirror motor down control circuit.

The remainder of the mirror functions operate in the same manner as described above. Placing the power mirror switch in opposing positions, left/right or up/down, will reverse the polarity to the mirror motor, reversing the direction of movement.

Inside Rearview Mirror with the Automatic Day-Night Feature System Components

The inside rearview mirror with the automatic day-night feature system consists of the following components

1. Inside rearview mirror
2. Ambient air temperature sensor

Compass

The mirror uses 2 magnetic field sensors for compass direction. One sensor is for north and south, the other is for east and west. The mirror supplies a signal and low reference to each sensor. As the vehicle travels with or against the earths magnetic pull, there will be a change in voltage on one or both sensors. As a result of the change in voltage, the mirror changes the heading on the compass display.

Temperature Display

The inside rearview mirror monitors the ambient air temperature sensor. As the outside air temperature gets warmer, the ambient air temperature sensor will lower resistance. The inside rearview mirror monitors this change and will show this as a warmer temperature on the display. Temperatures exceeding 62°C (143°F) will be out of the mirror's temperature range and SC will be shown on the temperature display. In colder outside air temperatures, the ambient air temperature sensor will raise in resistance. The inside rearview mirror will show a colder temperature on the display. Temperatures lower than -40°C (-40°F) will be out of the mirrors temperature range which OC will be shown on the temperature display. In cold temperatures such as 3°C (37°F) or below, the temperature display will show ICE when the ignition is first turned ON. The display will toggle between ICE and the actual outside temperature until the temperature update process is complete.

Temperature Display Update Process

The inside rearview mirror has a temperature program that takes in account the fact that the radiator will heat the ambient air temperature sensor if the radiator is warm and the vehicle is not moving. If the vehicle has been off for more than 2 hours, the mirror temperature program assumes that the radiator has cooled and that the temperature supplied by the ambient air temperature sensor is accurate. Because of this, if the vehicle has been off for more than 2 hours, the mirror displays the temperature as reported by the ambient air temperature sensor. When the ambient air temperature sensor reports a new temperature to the mirror, one of the following cases will apply

1. Ignition is OFF for more than 2 hours, then is turned ON for more than 3 minutes. The outside temperature is greater than the last temperature recorded by the mirror for 2 minutes. The mirror will increase the last temperature reading by one degree every 2 minutes for 8 consecutive times. If the outside temperature is not matched after the 8th update, the mirror will then display the current outside temperature.
2. Ignition is off for more than 2 hours, then is turned ON for less than 3 minutes. The mirror will update the temperature display every 2 seconds.
3. Ignition is OFF for more than 2 hours, then is turned ON for more than 3 minutes. The outside temperature is less than the last temperature recorded by the mirror. The mirror will then display the current outside temperature.
4. Ignition has been OFF for less than 2 hours. The outside temperature is greater than the last temperature recorded by the mirror, but the ignition is cycled from ON to OFF within 2 minutes. The mirror will display the old temperature.
5. Ignition has been OFF for less than 2 hours. The outside temperature is less than the last temperature recorded by the mirror. The mirror will then display the current outside temperature.

Switches of the Inside Rearview Mirror with the Automatic Day-Night Feature and Compass without OnStar®

The inside rearview mirror has 2 switches that perform the following functions

1. The MIRROR switch is used to enable or disable the automatic day-night feature of the mirror. With the ignition in the ON position, depress the MIRROR switch to enable the automatic day-night feature of the mirror. A green indicator will illuminate on the mirror when the automatic day-night feature is enabled. To disable the automatic day-night feature of the mirror, depress the MIRROR switch.
2. The COMPASS switch is used to turn the compass ON and OFF. With the ignition in the ON position, depress the COMPASS switch to turn the compass ON. Depress the COMPASS switch again to turn the compass OFF. The COMPASS switch is also used to place the compass into a calibration or zone mode. For more information, refer to «Compass Calibration and Magnetic Variance»(ref-277996-S42359859212008012100000) .

Switches of the Inside Rearview Mirror with the Automatic Day-Night Feature, Compass/Temperature Display without OnStar®

The inside rearview mirror has 2 switches that perform the following functions

1. The TEMP switch is used to turn the compass/temperature display ON or OFF, it is also used to enable or disable the automatic day-night feature of the mirror. With the ignition in the ON position, depress the TEMP switch to enable the compass/temperature display. Depress the TEMP switch again to disable the compass/temperature display. The TEMP switch can be held for 4 seconds in order to change the display from Fahrenheit (°F) to Celsius (°C), or from Celsius (°C) to Fahrenheit (°F). Depress the TEMP switch until the green indicator illuminates on the mirror. This indicates that the automatic day-night feature is enabled. To disable the automatic day-night feature of the mirror, depress the TEMP switch until the green indicator turns OFF.
2. The COMP switch is used to turn the compass/temperature display ON or OFF. With the ignition in the ON position, depress the COMP switch to turn the compass/temperature display ON. Depress the COMP switch again to turn the compass/temperature display OFF. The COMP switch is also used to place the compass into a calibration or zone mode. For more information, refer to «Compass Calibration and Magnetic Variance»(ref-277996-S42359859212008012100000) .

Switches of the Inside Rearview Mirror with the Automatic Day-Night Feature with Compass and OnStar®

The inside rearview mirror has 4 switches that perform the following functions

1. The ON/OFF switch located at the left side of the mirror performs the following functions: To enable or disable the automatic day-night feature of the mirror-With the ignition in the ON position, depress and hold the ON/OFF switch for 4 seconds to enable the automatic day-night feature of the mirror. A green indicator will illuminate on the mirror when the automatic day-night feature is enabled. To disable the automatic day-night feature of the mirror, depress and hold the ON/OFF switch for 4 seconds. To turn the compass ON and OFF-With the ignition in the ON position, depress the ON/OFF switch to turn the compass ON. Depress the ON/OFF switch again to turn the compass OFF. The ON/OFF switch is also used to place the compass into a calibration or zone mode. For more information, refer to «Compass Calibration and Magnetic Variance»(ref-277996-S42359859212008012100000) .
2. The 3 switches on the right side of the mirror are for OnStar® operation. For more information, refer to «OnStar Description and Operation»(ref-277998-S20403884232008012100000) .

Switches of the Inside Rearview Mirror with the Automatic Day-Night Feature, Compass/Temperature Display with OnStar®

The inside rearview mirror has 4 switches that perform the following functions

1. The ON/OFF switch located at the left side of the mirror performs the following functions: To enable or disable the automatic day-night feature of the mirror-With the ignition in the ON position, depress and hold the ON/OFF switch for 6 seconds to enable the automatic day-night feature of the mirror. A green indicator will illuminate on the mirror when the automatic day-night feature is enabled. To disable the automatic day-night feature of the mirror, depress and hold the ON/OFF switch for 6 seconds. To turn the compass/temperature display ON and OFF-With the ignition in the ON position, depress the ON/OFF switch to turn the compass/temperature display ON. Depress the ON/OFF switch again to turn the compass/temperature display OFF. The ON/OFF switch can be held for 4 seconds in order to change the display from Fahrenheit (°F) to Celsius (°C), or from Celsius (°C) to Fahrenheit (°F). The ON/OFF switch is also used to place the compass into a calibration or zone mode. For more information, refer to «Compass Calibration and Magnetic Variance»(ref-277996-S42359859212008012100000) .
2. The 3 switches on the right side of the mirror are for OnStar® operation. For more information, refer to «OnStar Description and Operation»(ref-277998-S20403884232008012100000) .