Lighting Systems: Other Chevrolet Uplander I

Backup Lamp - Right

Lighting Systems Connector End Views

Backup Lamp - Right

Scheme 30

Lighting Systems Connector End Views

Brake Pedal Position (BPP) Sensor

Cargo Lamp

Lighting Systems Connector End Views

Cargo Lamp

Center High Mounted Stop Lamp (CHMSL)

Lighting Systems Connector End Views

Center High Mounted Stop Lamp (CHMSL)

Scheme 31

Lighting Systems Connector End Views

Courtesy/Reading Lamp - Center

Courtesy/Reading Lamp - Front

Lighting Systems Connector End Views

Courtesy/Reading Lamp - Front

Scheme 32

Lighting Systems Connector End Views

Door Jamb Switch - Liftgate

Scheme 33

Lighting Systems Connector End Views

Headlamp - High Beam - Left (Early Production)

Scheme 34

Lighting Systems Connector End Views

Headlamp - High Beam - Left (Late Production)

Headlamp - High Beam - Right (Early Production)

Lighting Systems Connector End Views

Headlamp - High Beam - Right (Early Production)

Headlamp - High Beam - Right (Late Production)

Lighting Systems Connector End Views

Headlamp - High Beam - Right (Late Production)

Headlamp - Low Beam - Left

Lighting Systems Connector End Views

Headlamp - Low Beam - Left

Headlamp - Low Beam - Right

Lighting Systems Connector End Views

Headlamp - Low Beam - Right

Scheme 35

Lighting Systems Connector End Views

Headlamp Switch

Scheme 36

Lighting Systems Connector End Views

License Lamp - Left

License Lamp - Right

Lighting Systems Connector End Views

License Lamp - Right

Scheme 37

Lighting Systems Connector End Views

Marker Lamp - LF

Marker Lamp - RF

Lighting Systems Connector End Views

Marker Lamp - RF

Scheme 38

Lighting Systems Connector End Views

Multifunction Switch - I/P

Scheme 39

Lighting Systems Connector End Views

Park/Turn Signal Lamp - LF

Park/Turn Signal Lamp - RF

Lighting Systems Connector End Views

Park/Turn Signal Lamp - RF

Roof Rail Reading Lamp - Left

Lighting Systems Connector End Views

Roof Rail Reading Lamp - Left

Roof Rail Reading Lamp - Right

Lighting Systems Connector End Views

Roof Rail Reading Lamp - Right

Sliding Door Jamb Switch - Left

Lighting Systems Connector End Views

Sliding Door Jamb Switch - Left

Sliding Door Jamb Switch - Right

Lighting Systems Connector End Views

Sliding Door Jamb Switch - Right

Scheme 40

Lighting Systems Connector End Views

Tail/Stop and Turn Signal Lamp - Left

Tail/Stop and Turn Signal Lamp - Right

Lighting Systems Connector End Views

Tail/Stop and Turn Signal Lamp - Right

Scheme 41

Lighting Systems Connector End Views

Tail Lamp - Left

Tail Lamp - Right

Lighting Systems Connector End Views

Tail Lamp - Right

Scheme 42

Lighting Systems Connector End Views

Turn Signal/Multifunction Switch C1 (Early Production)

Scheme 43

Lighting Systems Connector End Views

Turn Signal/Multifunction Switch C1 (Late Production)

Scheme 44

Lighting Systems Connector End Views

Turn Signal/Multifunction Switch C2

Scheme 45

Lighting Systems Connector End Views

Turn Signal/Multifunction Switch C3

Scheme 46

Lighting Systems Connector End Views

Turn Signal/Multifunction Switch C4 (C25)

Scheme 47

Lighting Systems Connector End Views

Vanity Mirror Lamp - Left (DH6)

Vanity Mirror Lamp - Right (DH6)

Lighting Systems Connector End Views

Vanity Mirror Lamp - Right (DH6)

Intermittent

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

Automatic Lamp Control Inoperative

Automatic Lamp Control Inoperative

Backup Lamps Inoperative

Backup Lamps Inoperative

Courtesy Lamps Always On

Courtesy Lamps Always On

Courtesy Lamps Inoperative

Courtesy Lamps Inoperative

Daytime Running Lamps (DRL) Defeat Inoperative

Daytime Running Lamps (DRL) Defeat Inoperative

Daytime Running Lamps (DRL) Inoperative

Daytime Running Lamps (DRL) Inoperative

Hazard Lamps Always On

Hazard Lamps Always On

Hazard Lamps Inoperative

Hazard Lamps Inoperative

Headlamps Always On - Low or High Beam

Headlamps Always On - Low or High Beam

Headlamps Inoperative - High Beams

Headlamps Inoperative - High Beams

Headlamps Inoperative - Low Beams

Headlamps Inoperative - Low Beams

Headlamps Inoperative - Flash to Pass

Headlamps Inoperative - Flash to Pass

Illuminated Entry Lamps Inoperative

Illuminated Entry Lamps Inoperative

Interior Backlighting Does Not Dim

Interior Backlighting Does Not Dim

Interior Backlighting Inoperative

Interior Backlighting Inoperative

Park, License and Tail Lamps Always On

Park, License and Tail Lamps Always On

Park, License and Tail Lamps Inoperative

Park, License and Tail Lamps Inoperative

Reading Lamp(s) Always On

Reading Lamp(s) Always On

Reading Lamp(s) Inoperative

Reading Lamp(s) Inoperative

Stop Lamps Always On

Stop Lamps Always On

Stop Lamps Inoperative

Stop Lamps Inoperative

Turn Signal Lamps and/or Indicators Always On or Flashing

Turn Signal Lamps and/or Indicators Always On or Flashing

Turn Signal Lamps and/or Indicators Inoperative

Turn Signal Lamps and/or Indicators Inoperative

Vanity Mirror Lamp(s) Always On

Vanity Mirror Lamp(s) Always On

Vanity Mirror Lamp(s) Inoperative

Vanity Mirror Lamp(s) Inoperative

Scheme 48

Daytime Running Lamp, Park and Turn Signal Lamp and Bulb Replacement - Front

Visual Aiming Preparation Procedure

Headlamp aim should be checked

1. When a new headlamp capsule is installed
2. If service or repairs to the front end area have disturbed the headlamps or their mounting

The aiming screen and placement should meet the following criteria

1. The area will consist of a level surface large enough to allow for a vehicle and an additional 7.62 m (25 ft) measured from the face of the lamps to the front of the aiming screen.
2. The screen will be 1.52 m (5 ft) high x 3.66 m (12 ft) wide with a matte white surface well shaded from extraneous light and properly adjusted to the floor on which the vehicle stands. Provisions should be made so the aiming screen can be aligned parallel with the vehicle.
3. The screen shall be provided with a fixed vertical centerline, 2 laterally adjustable vertical tapes and one vertically adjustable horizontal tape.
4. If a regular commercial aiming screen is not available, the screen may consist of a vertical wall having a clear uninterrupted area approximately 1.83 m (6 ft) high and 3.66 m (12 ft) wide. The surface should be finished with a washable non-gloss white paint.
5. After the aiming screen has been set up in its permanent location, paint a reference line on the floor directly under the lens of the lamps to indicate the proper location of the headlamps when they are being aimed: Distance between headlamps (4) Center line of screen (5) Adjustable vertical pointer (2) Adjustable horizontal tape (6) Diagram of light screen (7) 7.62 m (25 ft) (9) Car axis (8) Horizontal center line of lamps (1)

Prior to aiming the headlamps, the following steps must be taken

1. Remove any snow, ice or mud from the vehicle, if applicable.
2. The vehicle must have a full tank of gas.
3. Stop all other work on the vehicle.
4. If any service has been performed on the vehicle, make sure that all of the components are back in their original place.
5. The vehicle must be on a level surface.
6. The vehicle left tires must be aligned with the reference line extending from the screen with the headlamps aligned with the reference line.
7. Do not load any cargo in the vehicle.
8. The vehicle must contain one person or 72.56 kg (160 lb) on the driver seat.
9. Inflate the tires to the proper pressure.
10. Simulate the vehicle loads if the intended use of the vehicle is for hauling heavy loads or towing a trailer.
11. Rock the vehicle in order to stabilize the suspension.
12. Turn ON the headlamps to low beam and observe the left and the top edges of the high intensity zone on the screen. The edges of the high intensity zone should fall within the specifications.

Headlamp Aiming Procedure

1. Open the hood.
2. Measure from the floor to the center of the headlamp bulb.
3. At the screen, measure from the floor and place the horizontal tape at the measured distance.
4. Measure from the reference line on the floor to the left headlamp bulb centerline.
5. At the screen, measure from the reference line and place the vertical tape at the measured distance.
6. Measure from the reference line on the floor to the right headlamp bulb centerline.
7. At the screen, measure from the reference line and place the vertical tape at the measured distance.
8. Turn ON the low beam headlamps and block the light from projecting onto the screen from the passenger side headlamp.
9. Adjust the screw (4) for the vertical aim of the headlamps to the specifications required by the state and the local authorities.
10. Rotate the headlamp adjuster to change the vertical aim of the headlamp.
11. Repeat the aiming procedure for the passenger side headlamp while blocking the light from projecting onto the screen from the driver side headlamp.
12. Turn the headlamps OFF.
13. Close the hood.

Headlamp aim should be checked

1. When a new headlamp capsule is installed
2. If service or repairs to the front end area have disturbed the headlamps or their mounting

The aiming screen and placement should meet the following criteria

1. The area will consist of a level surface large enough to allow for a vehicle and an additional 7.62 m (25 ft) measured from the face of the lamps to the front of the aiming screen.
2. The screen will be 1.52 m (5 ft) high x 3.66 m (12 ft) wide with a matte white surface well shaded from extraneous light and properly adjusted to the floor on which the vehicle stands. Provisions should be made so the aiming screen can be aligned parallel with the vehicle.
3. The screen shall be provided with a fixed vertical centerline, 2 laterally adjustable vertical tapes and one vertically adjustable horizontal tape.
4. If a regular commercial aiming screen is not available, the screen may consist of a vertical wall having a clear uninterrupted area approximately 1.83 m (6 ft) high and 3.66 m (12 ft) wide. The surface should be finished with a washable non-gloss white paint.
5. After the aiming screen has been set up in its permanent location, paint a reference line on the floor directly under the lens of the lamps to indicate the proper location of the headlamps when they are being aimed: Distance between headlamps (4) Center line of screen (5) Adjustable vertical pointer (2) Adjustable horizontal tape (6) Diagram of light screen (7) 7.62 m (25 ft) (9) Car axis (8) Horizontal center line of lamps (1)

Prior to aiming the headlamps, the following steps must be taken

1. Remove any snow, ice or mud from the vehicle, if applicable.
2. The vehicle must have a full tank of gas.
3. Stop all other work on the vehicle.
4. If any service has been performed on the vehicle, make sure that all of the components are back in their original place.
5. The vehicle must be on a level surface.
6. The vehicle left tires must be aligned with the reference line extending from the screen with the headlamps aligned with the reference line.
7. Do not load any cargo in the vehicle.
8. The vehicle must contain one person or 72.56 kg (160 lb) on the driver seat.
9. Inflate the tires to the proper pressure.
10. Simulate the vehicle loads if the intended use of the vehicle is for hauling heavy loads or towing a trailer.
11. Rock the vehicle in order to stabilize the suspension.
12. Turn ON the headlamps to low beam and observe the left and the top edges of the high intensity zone on the screen. The edges of the high intensity zone should fall within the specifications.

1. Open the hood.
2. Measure from the floor to the center of the headlamp bulb.
3. At the screen, measure from the floor and place the horizontal tape at the measured distance.
4. Measure from the reference line on the floor to the left headlamp bulb centerline.
5. At the screen, measure from the reference line and place the vertical tape at the measured distance.
6. Measure from the reference line on the floor to the right headlamp bulb centerline.
7. At the screen, measure from the reference line and place the vertical tape at the measured distance.
8. Turn ON the low beam headlamps and block the light from projecting onto the screen from the passenger side headlamp.
9. Adjust the vertical aim of the headlamps to the specifications required by the state and the local authorities or as shown in step number 8.
10. Rotate the headlamp adjuster to change the vertical aim of the headlamp.
11. Repeat the aiming procedure for the passenger side headlamp while blocking the light from projecting onto the screen from the driver side headlamp.
12. Turn the headlamps OFF.
13. Close the hood.

Scheme 49

High Mounted Stop Lamp Replacement

Exterior Lamps

The exterior lighting consists of the following lamps

1. The headlamps
2. The daytime running lamps (DRL)
3. The park, tail, marker and license lamps
4. The turn signal lamps
5. The hazard lamps
6. The stop lamps
7. The backup lamps

Headlamps

The headlamps may be turned ON 2 different ways. First, when the headlamp switch is placed in the headlamps position, for normal operation. Second, with the headlamp switch placed in the AUTO position, for automatic lamp control (ALC). During ALC, the headlamps will be in daytime running lamp (DRL) operation in daylight conditions or headlamp operation in low light conditions.

For headlamp operation, battery positive voltage is applied at all times to the coil and switch sides of the low or high beam relay in the underhood fuse block depending on the position of the headlamp dimmer switch. Ground to the headlamp switch is from G200. When the headlamp switch is placed in the HEAD position, ground is applied to the headlamp switch headlamps ON signal circuit of the body control module (BCM). When either the headlamp switch is placed in the headlamps position or ALC is enabled, the BCM applies a ground to the headlamp low or high beam relay control circuit. This energizes the relay and applies battery positive voltage to the left and right low or high beam fuses in the underhood fuse block, then through the headlamp supply voltage circuits to the headlamps. Ground is applied at all times to the left headlamp from G101 and to the right headlamp from G100.

For high beam operation, the dimmer switch supplies a ground signal to the BCM. Ground to the headlamp dimmer switch is from G200.

For flash-to-pass (FTP) operation, when the headlamp dimmer switch is placed in the FTP position, ground is applied from G200 through the headlamp dimmer switch to the FTP switch signal circuit to the BCM. The BCM then turns the high beam headlamps ON as long as the headlamp dimmer switch is held in the FTP position.

If the headlight switch is left in the headlamps position, the inadvertent power control feature will turn OFF the headlights 10 minutes after the ignition switch is turned to the OFF position. If the driver places the headlight switch in the headlamps position after the ignition switch has been turned OFF or if the ignition switch is in the ACCY position, the headlights will remain ON until turned OFF or the battery runs dead.

Automatic Lamp Control (ALC)

The normal headlamp switch operating position is AUTO, which enables the automatic lamp control (ALC). For ALC operation, the body control module (BCM) receives a signal from the ambient light sensor indicating a low or high ambient (outside) light level. The ambient light sensor is a light sensitive transistor that varies its voltage signal to the BCM in response to changes to the ambient light level. The BCM uses multiple inputs to determine daytime running lamp (DRL) or headlamp low/high beam operation. When the ignition key is turned to the RUN position the BCM determines the light/dark ambient light condition and activates the headlamps or DRL mode immediately. When a transition to the light/dark ambient light condition occurs after the ignition is in the RUN position there is an approximate 30-second delay in the headlamp/DRL transition.

The ALC System also has a defeat feature and a wiper activated headlamps feature. To operate the ALC defeat, turn the headlamp switch counter clockwise one position past the AUTO position after starting the vehicle. This is a momentary switch position and will return to the AUTO position. This action sends a temporary ground signal to the BCM requesting a change of states for the ALC. If the ALC is currently ON it will switch to OFF and if the ALC is currently OFF it will reset the ALC to ON.

The wiper activated headlamps feature is enabled anytime the ALC is enabled. When the front windshield wipers have been activated for approximately 30 seconds and the ALC is in the DRL mode, the BCM will switch to headlamps ON.

Lights On Warning

The body control module (BCM) activates the lights ON warning as requested by the headlamp dimmer switch. The lights ON warning sounds when all of the following occurs

1. The ignition key is out of the ignition.
2. The BCM determines that the driver door is open.
3. The BCM determines that the headlamp switch is in the PARK or HEAD position.

Daytime Running Lamps (DRL)

The ambient light sensor is a light sensitive transistor that varies its signal to the body control module (BCM) in response to changes in the outside ambient light level. Any function or condition that turns ON the headlamps will cancel daytime running lamp (DRL) operation. With the headlamp switch in the OFF position, activating automatic lamp control (ALC), the front turn signal lamps will be turned ON after a 30-second delay under daylight conditions, which is determined by the ambient light sensor signal to the BCM. The DRL operates when the ignition switch is in the RUN position, the front wipers are not activated and the transmission is not in PARK. When these conditions have been met and the ambient light sensor indicates daylight conditions, the BCM will illuminate the front turn signal lamps ON steady.

Park, Tail, Marker and License Lamps

The PARK/LAMP fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to both the coil and switch sides of the PRK LAMP relay, also located in the I/P fuse block. When the headlamp switch is placed in either the PARK or HEAD position, ground is supplied to the BCM on the park lamp switch ON signal circuit. The BCM then applies a ground to the park lamp relay control circuit. This energizes the relay, applying voltage to all park, tail, marker and license lamps. The park, tail, marker and license lamps are also turned ON when the headlamps are commanded ON by the BCM for low light operation.

Ground for the headlamp switch is from G200. Grounds for the various lamps are as follows

1. G100 supplies the right front lamps
2. G101 supplies the left front lamps
3. G400 supplies the right rear lamps
4. G401 supplies the left rear lamps

Remote Keyless Entry Exterior Lamp Illumination

When the remote function actuator (RFA) module receives a door unlock command from the remote function actuator transmitter, the RFA module will ground the door unlock signal circuit to the body control module (BCM) and send a class 2 message to the BCM, indicating that an UNLOCK command has been received. The BCM will then flash the park lamps twice. With all the doors closed and the remote keyless entry (RKE) transmitter used to lock the doors, the park lamps will flash twice.

Turn Signal Lamps

The STOP/TURN fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM) for the turn signal lamps. When the turn switch is placed in the left or right position, ground is applied to the BCM on the left or right turn signal switch signal circuit. The BCM then applies voltage to the appropriate front and rear supply voltage circuits.

Grounds for the various lamps are as follows

1. G100 supplies the right front lamps
2. G101 supplies the left front lamps
3. G400 supplies the right rear lamps
4. G401 supplies the left rear lamps

Hazard Lamps

The hazard lamps switch is part of the multifunction switch on the steering column. When the hazard switch is pressed, a ground signal is applied to the body control module (BCM) on the hazard switch signal circuit. Hazard lamp operation is the same as the turn signals, with all turn signals operating simultaneously. The ground for the hazard switch is G200.

Turn Signal Reminder

A chime or audio warning activates as a turn signal on warning if the turn signal remains ON for a specific distance traveled. The turn signal warning sounds when a turn signal remains active and the vehicle has traveled a distance of 1.2 km (0.75 mi).

The driver information center (DIC) turns the turn signal reminder OFF when the ignition switch or turn signal switch is turned to the OFF position.

Stop Lamps

The turn signal lamps are also used as stop lamps. The STOP/TURN fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM) for the stop lamps.

The brake pedal position sensor is a resistive device used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is pressed. The brake pedal position sensor receives a low reference signal and a 10-volt reference voltage from the body control module (BCM) to supply a variable signal input directly to the BCM on the brake pedal position sensor signal circuit when the brakes are applied. When the signal reaches a voltage threshold indicating the brakes have been applied, the BCM then applies a battery positive voltage to the left rear and right rear stop/turn lamp supply voltage circuits to illuminate the stop lamps in the tail lamp assemblies and to the stop lamp supply voltage circuit to illuminate the center high mounted stop lamp (CHMSL). The stop lamps will operate when the ignition switch is not in the OFF position.

The stop lamp supply voltage circuit also supplies the powertrain control module (PCM) and the electronic brake control module (EBCM) for other functions and is from a separate pin in the BCM connector. A short to ground or voltage on this circuit will also cause the stop lamps to operate incorrectly.

Backup Lamps

The CHMSL BACKUP fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM). When the driver places the gear selection into the REVERSE position, the powertrain control module (PCM) sends a class 2 message to the BCM. The message indicates that the gear selector lever is in the REVERSE position. The BCM then applies voltage to the backup lamp supply voltage circuit. Ground for the left backup lamps is from G401 and for the right backup lamp is from G400.

Battery Rundown Protection/Inadvertent Power

The body control module (BCM) controls the lighting system through circuits that enable headlamps and the courtesy lamps. If one of these lamps is left ON, battery rundown protection/inadvertent power feature will turn OFF the lamps 20 minutes after the ignition switch is turned to the OFF position. If the ignition switch is turned to any position other than OFF or if a lamp is activated during this 20-minute period, the circuits will then be enabled.

If the headlamp switch is placed in the HEAD position after the ignition switch has been turned OFF or if the ignition switch is in the ACCY position, the headlights will remain ON until turned OFF or the battery runs dead.

Interior Lighting

The interior lighting consists of lamps that may not be dimmed (Interior Lamps) and lamps that may be dimmed (Interior Lamps Dimming). The courtesy, reading, cargo and vanity lamps are grounded at G302 at all times.

Interior Lamps

The first group of lamps are the interior courtesy lamps that may not be dimmed manually, these include

1. The cargo lamp
2. The courtesy/reading lamps
3. The roof rail reading lamps
4. The vanity mirror lamps

Interior Lamps Features

The interior lamps system features the following functions

1. An illuminated entry feature that illuminates the courtesy lamps when entering the vehicle or activating the remote keyless entry (RKE) system
2. An illuminated exit feature that illuminates the courtesy lamps when the ignition key has been removed from the ignition
3. An inadvertent power feature that supplies voltage to all interior lamps after the ignition is turned OFF-The inadvertent power feature will deactivate all interior lamps 20 minutes after removing the ignition key and closing all doors to prevent battery rundown.
4. A theatre dimming feature that can slowly dim the interior lamps from full brightness to OFF
5. An instrument panel (I/P) dimmer switch, for manual control of the courtesy lamps
6. Courtesy lamps defeat which allows the lamps to remain OFF when the doors are opened and for illuminated entry/exit.
7. Individual switches for control of the reading and vanity lamps

Courtesy/Illuminated Entry Lamps

The courtesy lamp high control circuit supplies voltage to the courtesy lamps and cargo lamps. The lamps are illuminated when they receive a battery positive voltage from the courtesy lamp high control circuit of the body control module (BCM). The BCM will supply voltage to the courtesy lamp high control circuit for illuminated entry under the following conditions

1. The ignition is in the LOCK position.
2. The I/P dimmer switch is in the door position.
3. The door jamb input transitions to an active state (opening a door).
4. The use of the RKE to unlock the side doors

When the driver uses the remote function actuator transmitter to unlock the doors, the BCM will illuminate the courtesy lamps for approximately 40 seconds, unless another BCM function causes the lamps to remain active. If the ignition switch is turned to either the RUN or START position, the courtesy lamps will turn OFF immediately.

When the door latch switch signal circuit is active with the ignition in the OFF position, the BCM will illuminate the courtesy lamps. The courtesy lamps will remain illuminated for approximately 25 seconds after the door latch switch signal circuit becomes inactive, unless another BCM function causes the lamps to remain active. If the ignition switch is turned to either the RUN or START position, the courtesy lamps will turn OFF immediately.

Courtesy/Illuminated Exit

The illuminated exit feature will activate the courtesy lamps when the KEY IN input of the BCM transitions from an active state to an inactive state (removing the ignition key). When the key is removed from the ignition, the KEY IN input to the BCM becomes inactive. The BCM will illuminate the courtesy lamps for approximately 25 seconds, unless another BCM function causes the lamps to remain active.

Inadvertent Power Feature

Inadvertent power feature provides a similar function for the interior lamps as a retained accessory power feature. The BCM will energize the courtesy lamp high control circuit and the inadvertent power courtesy lamp circuits when the BCM is in the active state (awake). When these circuits are energized, voltage is to all the interior lights, including the courtesy, cargo, reading and vanity lamps. Any time a switch is activated to the ON position the BCM will wake up and apply voltage to the lamps after the ignition is turned OFF so that the interior lamps may be operated. The inadvertent power feature will also act as battery run down protection by deactivating the circuits after 20 minutes once the BCM becomes inactive (ignition OFF and no BCM input activity.)

Theater Dimming

The theatre dimming feature that can slowly dim the interior lamps from full brightness to OFF with pulse width modulation (PWM). The following actions will override the theatre dimming feature causing the courtesy lamps to deactivate immediately if no other BCM function commands the courtesy lamps ON

1. A transition from active to inactive of the interior lamps switch (turning off the interior lamps switch)
2. A LOCK command from the RKE system
3. A last door closed locking function (locking and closing all the doors)

Roof Rail Reading Lamps

The roof rail reading lamps receive voltage on the inadvertent power courtesy lamp circuit and are turned ON by the individual switch on the lamp assembly.

Courtesy/Reading Lamps

The courtesy/reading lamps receive voltage in 2 ways. The reading lamps receive voltage on the inadvertent power courtesy lamp circuit, which has voltage any time the BCM is awake and are turned ON by the individual switch on the lamp assembly. The courtesy lamps receive voltage on the courtesy lamp high control circuit, controlled by the BCM.

Vanity Mirror Lamps

When the vanity mirror cover on the sunshade is opened, the sunshade mirror lamp illuminates. The vanity mirror lamps receive voltage on the inadvertent power courtesy lamp circuit, which has voltage any time the BCM is awake and are turned ON by the individual switch.

Interior Lamps Dimming

The second group of lamps include lamps which may be dimmed. These lamps include

1. The instrument panel cluster (IPC)
2. Door lock, window, seat, switches
3. HVAC control head assembly
4. Outside rearview mirror switches
5. Radio
6. Steering wheel controls
7. I/P multifunction switch
8. Overhead console multifunction switch
9. The headlamp switch
10. Garage door opener

Any time the body control module (BCM) activates the headlamps or park lamps, the interior dimming lamps are also activated. The BCM applies a voltage reference and a low reference signal to the panel dimmer switch. The BCM then receives a variable signal from the panel dimmer switch to indicate the desired lamp intensity. The BCM then applies the voltage necessary through the instrument panel lamp supply voltage to all dimming lamps.

Modules and Driver Controls

The BCM module processes the inputs and outputs for most of the interior lamps, with the exception of the reading and vanity lamps, which receive voltage from the BCM and control on the ground side of the lamps integral switches. Driver controls include the following components

1. The instrument panel (I/P) dimmer switch
2. The jamb or ajar switches
3. The headlamp switch
4. The reading lamp switches
5. The vanity mirror lamps switches