Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2023 and prior GM passenger cars and trucks, including medium duty trucks and excluding LCF medium duty trucks.

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  2023 and Prior GM Passenger Cars and Trucks (including Medium Duty Trucks) (Excluding LCF Medium Duty Trucks)

• Exterior lamps such as cornering, turn signal, backup, head or tail lamps may show very small water droplets, a fine mist or white fog (condensation) on the inside of the lens.

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  Some exterior lamps, such as cornering, turn signal, backup, headlamps or tail lamps may exhibit very small droplets of water, a fine mist or white fog (condensation) on the inside of the lamp lens.

Possible causes

• Condensation occurs when the air inside the lamp assembly reaches the dew point through atmospheric changes.

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  Condensation occurs when the air inside the lamp assembly, through atmospheric changes, reaches the “dew point.”

• Non-OE lamps are most often presented as holding moisture or with inoperative bulbs from corroded electrical connections; they appear to be installed as part of a collision repair.

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  These lamps are most often presented by customers as holding moisture or for inoperative bulbs due to corroded electrical connections. It appears these non OE lamps get installed on vehicles as part of a collision repair.

Steps to confirm (in the document’s order)

1. Normal: the mist is located mainly in the lens corners near the vents and does not cover more than half the lens surface.

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   May be located primarily in the lens corners (near the vents) and SHOULD NOT cover more than half the lens surface.

2. Normal: the moisture clears when the vehicle is parked in a dry environment or driven with the lights on.

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   The condition should clear of moisture when the vehicle is parked in a dry environment, or when the vehicle is driven with the lights ON.

3. Leak: water has accumulated in the bottom of the lamp assembly.

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   An accumulation of water in the bottom of the lamp assembly.

4. Leak: the condition will not clear when the vehicle is parked in a dry environment or driven with the lights on.

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   A condition that WON'T clear when the vehicle is parked in a dry environment, or when the vehicle is driven with the lights ON.

Repair

• A condition covering more than half the surface of the lamp lens indicates the need to service the lens or lamp assembly.

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  Note: Any of the conditions listed below would indicate the need to service the lens or lamp assembly. • A condition that covers more than half the surface of the lamp lens.

Caution

• Depending on the lamp and the atmospheric conditions, the time needed to clear the lamp may vary from 2 to 6 hours.

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  Depending on the size, shape and location of the lamp on the vehicle, and the atmospheric conditions occurring, the amount of time required to clear the lamp may vary from 2 to 6 hours.

• If the normal conditions are noted, advise the customer that replacing the lamp assembly may not correct the condition.

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  If the above conditions are noted, the customer should be advised that replacement of a lamp assembly may not correct this condition.

• Moisture that "comes and goes" is considered a normal condition.

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  Moisture “coming and going” is considered a normal condition.