Mirror System: Other Chevrolet Silverado 3500 HD

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-317174-S12965592502009060900000)
2. «Control Module References»(ref-317173-S10180079792009060900000) for DDM or PDM 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-317174-S12965592502009060900000)
2. «Control Module References»(ref-317173-S10180079792009060900000) for DDM or PDM 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-317174-S24821736412009060900000)
2. «Control Module References»(ref-317173-S10180079792009060900000) for DDM or PDM replacement, setup and programming

Reference Information

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Outside Mirror Description and Operation (Heated Mirrors) or Outside Mirror Description and Operation (Power Mirrors)

Electrical Information Reference

1. «Circuit Testing»(ref-317172-S12100958872009060900000)
2. «Connector Repairs»(ref-317172-S41839496312009060900000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-317172-S08096213032009060900000)
4. «Wiring Repairs»(ref-317172-S40815672902009060900000)

Scan Tool References

Control Module References for scan tool information.

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-317174-S12965592502009060900000)
2. «Control Module References»(ref-317173-S10180079792009060900000) for DDM or PDM replacement, setup, and programming

Symptoms - Mirrors

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) 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 (Heated Mirrors)»(ref-317174-S01944119412009060900000) «Outside Mirror Description and Operation (Power Mirrors)»(ref-317174-S06156249552009060900000) «Automatic Day-Night Mirror Description and Operation»(ref-317174-S24507035672009060900000)

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

Component Connector End Views

Description and Operation

Outside Mirror Description and Operation (Heated Mirrors) or Outside Mirror Description and Operation (Power Mirrors)

Electrical Information Reference

1. «Circuit Testing»(ref-317172-S12100958872009060900000)
2. «Connector Repairs»(ref-317172-S41839496312009060900000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-317172-S08096213032009060900000)
4. «Wiring Repairs»(ref-317172-S40815672902009060900000)

Scan Tool Reference

Control Module References for scan tool information.

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 Malfunction»(ref-317154-S30955356192009060900000) .
2. 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-317174-S24821736412009060900000)
2. «Control Module References»(ref-317173-S10180079792009060900000) for DDM, and PDM replacement, setup, and programming

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Outside Mirror Description and Operation (Heated Mirrors) or Outside Mirror Description and Operation (Power Mirrors)

Electrical Information Reference

1. «Circuit Testing»(ref-317172-S12100958872009060900000)
2. «Connector Repairs»(ref-317172-S41839496312009060900000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-317172-S08096213032009060900000)
4. «Wiring Repairs»(ref-317172-S40815672902009060900000)

Scan Tool Reference

Control Module References for scan tool information.

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 Malfunction»(ref-317154-S30955356192009060900000) .
2. 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-317174-S00859808272009060900000)
2. «Outside Rearview Mirror Schematics»(ref-317174-S21569939202009060900000)

Connector End View Reference

Component Connector End Views

Description and Operation

Automatic Day-Night Mirror Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-317172-S12100958872009060900000)
2. «Wiper/Washer Schematics»(ref-317160-S33420138582009060900000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-317172-S08096213032009060900000)
4. «Wiring Repairs»(ref-317172-S40815672902009060900000)

Scan Tool Reference

Control Module References for scan tool information.

1. Ignition 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.
2. Place the transmission in REVERSE. The inside rearview mirror face should transition from dim to bright. If the mirror does not transition between the bright and dim states, refer to «Inside Rearview Mirror Dimming Malfunction»(ref-317174-S04023471062009072000000) .
3. Vehicle in PARK, the outside rearview mirror face should dim.
4. Place the transmission in REVERSE. The outside rearview mirror face should transition from dim to bright. If the mirror does not transition between the bright and dim states, refer to «Outside Rearview Mirror Dimming Malfunction»(ref-317174-S27146983142009072000000) .

Inside Rearview Mirror Dimming Malfunction

1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
2. Test for less than 10 ohms between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, Verify that a test lamp illuminates between the ignition circuit terminal 13 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
4. Park brake applied, vehicle in REVERSE, verify that a test lamp illuminates between the backup lamp control circuit terminal 9 and ground. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to «Backup Lamps Malfunction (Automatic Transmission)»(ref-317143-S02366784942009060900000) or «Backup Lamps Malfunction (Manual Transmission)»(ref-317143-S24146517062009060900000) .
5. If all circuits test normal, test or replace the inside rearview mirror.

Outside Rearview Mirror Dimming Malfunction

1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
2. Ignition ON, verify a test lamp does not illuminate between the following circuits and ground: Signal circuit terminal 5 Low reference circuit terminal 16 If the test lamp illuminates, test the appropriate circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the following circuits and ground: Signal circuit terminal 5 Low reference circuit terminal 16 If less than the specified range, test the appropriate circuit for a short to ground.
4. Test for less than 100 ohms between the signal circuit terminal 5 and the low reference circuit terminal 16. If greater than the specified range, test both circuits for an open/high resistance. If the circuit tests normal, test or replace the driver outside rearview mirror glass.
5. If all circuits test normal, replace the inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Inside Rearview Mirror Replacement»(ref-317174-S19225459872009060900000)
2. «Outside Rearview Mirror Glass Replacement»(ref-317174-S24821736412009060900000)

Schematic Reference

Inside Rearview Mirror Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Automatic Day-Night Mirror Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-317172-S12100958872009060900000)
2. «Connector Repairs»(ref-317172-S41839496312009060900000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-317172-S08096213032009060900000)
4. «Wiring Repairs»(ref-317172-S40815672902009060900000)

Scan Tool Reference

Control Module References for scan tool information

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.
2. Place the transmission in REVERSE. The inside rearview mirror face should transition from dim to bright.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Inside Rearview Mirror Replacement

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Outside Mirror Description and Operation (Heated Mirrors) or Outside Mirror Description and Operation (Power Mirrors)

Electrical Information Reference

1. «Circuit Testing»(ref-317172-S12100958872009060900000)
2. «Connector Repairs»(ref-317172-S41839496312009060900000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-317172-S08096213032009060900000)
4. «Wiring Repairs»(ref-317172-S40815672902009060900000)

Scan Tool Reference

Control Module References for scan tool information.

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 DDM.
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-317174-S12965592502009060900000)
2. «Control Module References»(ref-317173-S10180079792009060900000) for DDM or PDM replacement, setup, and programming

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Outside Mirror Description and Operation (Heated Mirrors) or Outside Mirror Description and Operation (Power Mirrors)

Electrical Information Reference

1. «Circuit Testing»(ref-317172-S12100958872009060900000)
2. «Connector Repairs»(ref-317172-S41839496312009060900000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-317172-S08096213032009060900000)
4. «Wiring Repairs»(ref-317172-S40815672902009060900000)

Scan Tool References

Control Module References for scan tool information.

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, Right, and Left. If the parameter does not cycle between the specified values, replace the DDM.
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 DDM.
3. Using the mirror directional switch operate the left and right outside mirrors to move up, down, left and right. The mirrors should move in the commanded directions. If a mirror does not move in all the commanded directions refer to, Mirror Motor Circuit Test.
4. Operate the memory 1 and 2 recall switches. The outside rearview mirrors should adjust to the stored memory settings. If a mirror does not adjust to the stored memory setting refer to, Mirror Position Sensor Circuit Test.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Outside Rearview Mirror Motor Replacement»(ref-317174-S12965592502009060900000)
2. «Control Module References»(ref-317173-S10180079792009060900000) for DDM or PDM replacement, setup, and programming

Schematic Reference

Outside Rearview Mirror Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Outside Mirror Description and Operation (Heated Mirrors) or Outside Mirror Description and Operation (Power Mirrors)

Electrical Information Reference

1. «Circuit Testing»(ref-317172-S12100958872009060900000)
2. «Connector Repairs»(ref-317172-S41839496312009060900000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-317172-S08096213032009060900000)
4. «Wiring Repairs»(ref-317172-S40815672902009060900000)

Scan Tool References

Control Module References for scan tool information.

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. Ignition ON, 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.

1. «Outside Rearview Mirror Motor Replacement»(ref-317174-S12965592502009060900000)
2. «Power Mirror Switch Replacement (with DL8 and without SLT)»(ref-317174-S12538198052009060900000)

Scheme 9

Scheme 10

Scheme 11

Heated OSRV Mirror

On vehicles equipped with heated outside rearview (OSRV) mirrors, the driver door switch (DDS) and passenger door switch (PDS) controls the activation of the mirror heaters. Upon receiving a LAN message indicating a request for heated mirrors, the driver door switch (DDS), and passenger door switch (PDS) for the passenger side, will activate the mirror heater output. The mirror heaters will remain active until a new message is received indicating rear defogger is to be deactivated, either by driver input or by expiration of a calibrated timer.

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 4 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 3 position switch that allows the operator to select the left or right mirror and also a neutral/fold position
5. Left Outside Power Mirror-Contains both the vertical and horizontal mirror motors
6. Right Outside Power Mirror-Contains both the vertical and horizontal mirror motors
7. Body Control Module - An electronic control module that requires programming when replaced, serves as the power mode master and is the main message handler
8. Memory Switch, if equipped with memory mirrors-Supplied power by the DDS and provides a voltage signal to the DDS upon a switch activation
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. Powertrain Control Module (PCM), if equipped with memory mirrors - An electronic control module that requires programming when replaced and provides the message indicating transmission gear selection
11. Driver Information Center (DIC), if equipped with memory mirrors-Part of the instrument cluster which is a an electronic control module that requires programming when replaced and is used to personalize the memory recall functions
12. Fold 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/fold 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 mirror direction switch also functions as the folding mirror switch. When the selector switch is in the neutral/fold position, activate the mirror direction switch to the left to extend the mirrors and right to retract the mirrors.

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 driver door switch (DDS) and passenger door switch (PDS) are capable of storing mirror positions and controlling the mirrors to these positions to the preferred settings of 2 different drivers. Each driver will be able to personalize the memory system by positioning the mirrors and seats to their preferred settings. Then press and hold the memory 1 or memory 2 button until an audible chime is heard and the current mirror positions will be stored into memory of the DDS and PDS. Seat position will be stored in the driver position module (DPM). Once the mirror and seat positions have been stored into memory, a momentary memory 1 or memory 2 switch activation will supply the DDS a battery voltage signal. The DDS, upon receipt of the memory switch signal, with the transmission in park or neutral, will then drive the driver mirror to the corresponding stored memory position. The DDS will also send a LAN message to the PDS and DSM indicating that a memory switch activation occurred. The PDS will then drive the passenger mirror and the DPM will drive the driver seat to the corresponding stored memory position. The memory system can also be controlled by any of the following if programmed using the driver information center (DIC) to enable/disable the features

1. Auto exit/entry seat positioning
2. Mirror and seat position recall on a keyless entry unlock activation
3. Mirror and seat position recall on ignition key insertion

For further information on programming and configuration, refer to the vehicles owners manual.

Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The DDS and PDS supplies a reference voltage and a low reference to these sensors and determines mirror position through the horizontal and vertical position signal circuits.

The memory switch receives power from the DDS through the battery supply voltage circuit and the DDS fuse. The DDS upon receipt of a memory switch signal input or an appropriate LAN message from the BCM, the DDS and PDS will then supply battery voltage and ground to the appropriate power mirror motors through the mirror motor control circuits to move the mirrors to the predetermined positions.

The folding mirror system requires signals from 2 separate switches. The mirror select switch must be in the neutral/fold position and the mirror direction switch must be activated to the left/extend or right/retract positions. Both switches are integrated into the DDS and provide direct signals.

Upon receipt of the required switch inputs the DDS will supply battery voltage and ground to the mirror fold 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 fold motor control circuits to perform the requested extend or retract function.

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 earth's 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-317147-S10080936742009060900000) .

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-317147-S10080936742009060900000) .

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-317147-S10080936742009060900000) .
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-317145-S35179768822009060900000) .

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-317147-S10080936742009060900000) .
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-317145-S35179768822009060900000) .