HID BULB Halogen Bulb Warning Component Testing Circuit/System

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2010 Buick LaCrosse 3.0L Eng CXL 1Search™ HID BULB

Halogen Bulb Warning

WARNING: Halogen bulbs contain gas under pressure. Handling a bulb improperly could cause it to shatter into flying glass fragments. To help avoid personal injury:

• Turn off the lamp switch and allow the bulb to cool before changing the bulb.

• Leave the lamp switch OFF until the bulb change is complete.

• Always wear eye protection when changing a halogen bulb.

• Handle the bulb only by its base. Avoid touching the glass.

• Keep dirt and moisture off the bulb.

• Properly dispose of the used bulb.

• Keep halogen bulbs out of the reach of children.

Component Testing

Static Test

1. Ignition ON, observe the scan tool Ambient Light Sensor parameter. The reading should be between 1.4-4.5 V and change with ambient light changes.

2. Test the B10B Ambient Light/Sunload Sensor by varying the ambient light while monitoring the sensors voltage output.

3. Verify that the voltage output is within the range of the specification.

1. If not within the specified range, replace the B10B Ambient Light/Sunload Sensor.

Circuit/System Verification

Ignition ON, observe the scan tool Ambient Light Sensor parameter. The reading should be between 1.4-4.5 V and change with ambient light changes.

Repair Procedures [ Automatic Light Malfunction ]

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Sun Load Temperature and Headlamp Automatic Control Ambient Light Sensor Replacement

• Control Module References for BCM replacement, setup and programming

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Repair Procedures [ High Intensity Discharge Lamp Malfunction ]

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an Electrical Center)

• Headlamp Replacement

• Headlamp Ballast Replacement (TT2)

• Control Module References for BCM replacement, setup and programming

Daytime Running Lamp Bulb Replacement (TT2)

Fig 1: Daytime Running Lamp Bulb (TT2)

Courtesy of GENERAL MOTORS CORP.

Callout Component Name

Preliminary Procedures

WARNING: The high intensity discharge system produces high voltage and current. In order to reduce the risk of severe shocks and burns, the battery negative cable must be disconnected any time service work is being performed on or around the high intensity discharge system.

WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns:

1. Never open the high intensity discharge system ballast or the arc tube assembly starter.

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2. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.

WARNING: Refer to Halogen Bulb Warning .

1. Remove the front compartment sight shield. Refer to Front Compartment Sight Shields Replacement .

2. Partially disengage the electrical jumper harness from the headlamp.

3. Rotate and remove the bulb socket.

4. Pull the daytime running lamp bulb (DRL) from the lamp socket.

1 Daytime Running Lamp Bulb

Headlamp Ballast Replacement (TT2)

Fig 2: Headlamp Ballast (TT2)

Courtesy of GENERAL MOTORS CORP.

Callout Component Name

Preliminary Procedure:

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WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns:

• Never open the high intensity discharge system ballast or the arc tube assembly starter.

• Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.

Remove the headlamp assembly. Refer to Headlamp Replacement .

Headlamp Ballast Screw (Qty:3)

1 CAUTION: Refer to Fastener Caution .

Tighten: Hand tighten the screws equally.

Headlamp Ballast Assembly 2 Tip: Ensure the seal is not damaged when installing the ballast back into the headlamp assembly.

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Headlamp Bulb Replacement (TT2)

Fig 3: Headlamp Bulb (TT2)

Courtesy of GENERAL MOTORS CORP.

Callout Component Name

Preliminary Procedures

WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns:

1. Never open the high intensity discharge system ballast or the arc tube assembly starter.

2. Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.

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1. Remove the front compartment sight shield. Refer to Front Compartment Sight Shields Replacement .

2. Remove the headlamp bulb accessory cover assembly.

3. Disconnect the headlamp bulb electrical connector from the bulb.

4. Remove the three screws from the headlmap bulb.

5. Rotate and remove the headlamp bulb.

Headlamp Bulb Accessory Cover Assembly 1 Procedure: Rotate the cover counter-clockwise and remove from the headlamp housing.

Headlamp Bulb Screw (Qty: 3)

2 CAUTION: Refer to Fastener Caution .

Headlamp Bulb

WARNING: Refer to Halogen Bulb Warning . 3

Tip: Rotate and remove the bulb.

Headlamp Bulb Replacement (TT4 High Beam)

Fig 4: Headlamp Bulb (TT4 High Beam)

Courtesy of GENERAL MOTORS CORP.

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Callout Component Name

Preliminary Procedure: Remove the front compartment sight shield. Refer to Front Compartment Sight Shields Replacement .

Headlamp Bulb Accessory Cover Assembly 1 Tip: Disconnect the electrical connector from the headlamp bulb socket.

Headlamp Bulb

WARNING: Refer to Halogen Bulb Warning . 2

Procedure: Rotate the bulb socket a quarter turn counter-clockwise and remove.

Headlamp Bulb Replacement (TT4 Low Beam)

Fig 5: Headlamp Bulb (TT4 Low Beam)

Courtesy of GENERAL MOTORS CORP.

Callout Component Name

Preliminary Procedure: Remove the front compartment sight shield. Refer to Front Compartment Sight Shields Replacement .

Headlamp Bulb Accessory Cover Assembly 1 Tip: Disconnect the electrical connector from the headlamp bulb socket.

2 Headlamp Bulb

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WARNING: Refer to Halogen Bulb Warning .

Procedure: Rotate the bulb socket a quarter turn counter-clockwise and remove.

Headlamp Replacement

Fig 6: Headlamp

Courtesy of GENERAL MOTORS CORP.

Callout Component Name

Preliminary Procedure: Remove the front bumper fascia. Refer to Front Bumper Fascia Replacement .

Headlamp Screw (Qty: 4)

CAUTION: Refer to Fastener Caution . 1

Tighten: 2.5 N.m (22 lb in)

2 Headlamp Assembly (W/Front Side Marker and Park and Turn Signal Lamp)

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WARNING: Refer to Halogen Bulb Warning .

Procedure

1. Pull the headlamp assembly forward in order to access and disconnect the forward lamp harness electrical connector from the headlamp jumper harness connector.

2. Remove the headlamp bulb accessory covers.

3. Transfer the headlamp bulbs as needed.

4. Aim the headlamps after the headlamps have been re-installed. Refer to Headlamp Aiming .

When To Change The HID Bulb

An inoperative bulb, end of life occurs when the bulb gets old and becomes unstable. The bulb may begin shutting itself OFF sporadically and unpredictably at first, perhaps only once during a 24 h period. When the bulb begins shutting itself off occasionally, the ballast will automatically turn the bulb back ON again within 0.5 s. The ballast will restrike the bulb so quickly that the bulb may not appear to have shut off. As the bulb ages, the bulb may begin to shut off more frequently, eventually over 30 times per minute. When the bulb begins to shut off more frequently, the ballast receives an extreme amount of repetitive current input. Repetitive and extreme amount restarts or restrikes, without time for the ballast to cool down, will permanently damage the ballast. As a safeguard, when repetitive restrikes are detected, the ballast will not attempt to restrike the lamp. The ballast then shuts down and the bulb goes out.

The following symptoms are noticeable signs of an inoperative bulb:

• Flickering light, caused in the early stages of an inoperative bulb

• Lights go out, caused when the ballast detects, repetitive bulb restrike

• Color change - The lamp may change to a dim pink glow.

Input power to the ballast must be terminated in order to reset the ballasts fault circuitry. In order to terminate the input power to the ballast, turn the lights OFF and back ON again. Turning the lights OFF and back ON again resets all of the fault circuitry within the ballast until the next occurrence of an extreme amount of repetitive bulb restrike. When an extreme amount of repetitive bulb restrikes occur, replace the starter/arc tube assembly. The ballast will begin the start-up process when the starter/arc tube assembly is replaced. Repeatedly resetting the input power can overheat the internal components and cause permanent damage to the ballast. Allow a few minutes of cool-down time in between reset attempts.

Inoperative bulbs are often sporadic at first, and difficult to repeat. Inoperative bulbs can be identified by observing if the condition gets progressively worse over the next 100 h of operation.

Diagnostic Fault Information [ Automatic Light Malfunction ]

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Circuit Short to Open/High Short to Signal Ground Resistance Voltage Performance

Ambient Light Sensor B2645 03 B2645 03 B2645 07 - Signal

Ground - 1 - -

1. Daytime Running Light Malfunction

Diagnostic Fault Information [ High Intensity Discharge Lamp Malfunction ]

Short to Open/High Short to Signal Circuit Ground Resistance Voltage Performance

Relay Coil Control 2 1 1 -

Headlamp Low Beam 1 1 2 - Control

Low Beam Headlamp - 1 - - Ground

1. Low Beam Headlamps Inoperative 2. Low Beam Headlamps Always ON

Diagnostic Instructions [ High Intensity Discharge Lamp Malfunction ]

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Instructions [ Automatic Light Malfunction ]

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Headlamp Aiming

Aiming Headlamps (Visual Aim)

NOTE: Some state and local laws specify requirements for headlamp aim. All of these laws must be complied with when performing any headlamp aiming operations.

Headlamp aim should be checked:

• When a new headlamp capsule is installed.

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• If service or repairs to the front end area have (or may have) disturbed the headlamps or their mounting.

• Suspension components have been replaced or repaired.

• 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 face of lamps to the front of the aiming screen.

• 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 may be made for moving the screen so it can be aligned parallel with the vehicle.

• The screen shall be provided with a fixed vertical centerline, 2 laterally adjustable vertical tapes, and 1 vertically adjustable horizontal tape.

• 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.

• After the aiming screen has been set up in its permanent location, it is necessary to 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 (1)

◦ Center line of screen (2)

◦ Adjustable vertical pointer (3)

◦ Adjustable horizontal tape (4)

◦ Diagram of light screen (5)

◦ Vertical center line ahead of right headlamp pointer position (6)

◦ 7.62 m (25 ft) (7)

◦ Car centerline axis (8)

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Fig 7: Headlamp Aiming/Adjusting

Courtesy of GENERAL MOTORS CORP.

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

1. Remove any snow, ice or mud from the vehicle.

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 vertical reference line (2).

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Fig 8: Aligining Left Tires With Reference Line

Courtesy of GENERAL MOTORS CORP.

7. Do not load any cargo in the vehicle.

8. The vehicle must contain 1 person or 72.56 kg (160 lb) on the driver's 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.

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2. Measure from the floor to the center of the headlamp bulb, some headlamps have an aim dot marked on the headlamp lens. Fig 9: Measuring Distance Between Headlamp Face & Aiming Screen

Courtesy of GENERAL MOTORS CORP.

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.

NOTE: Do not cover the headlamp, this may cause excessive heat build up.

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8. Turn on the low beam headlamps and block the light from projecting onto the screen from the passenger side headlamp. Fig 10: Identifying Right Side Low Beam Proper Screen Position

Courtesy of GENERAL MOTORS CORP.

NOTE: Horizontal headlamp adjustment does not exist.

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. Close the hood.

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