Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2022 and prior GM passenger cars and trucks, including medium duty trucks but excluding LCF medium duty trucks.

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  2022 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 droplets of water, 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.”

• The vent system operates at all times but is most effective when the lamps are on and the vehicle is in motion.

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  The vent system operates at all times, however, it is most effective when the lamps are ON and when the vehicle is in motion.

Steps to confirm (in the document’s order)

1. Normal condensation may sit mainly in the lens corners (near the vents) and should 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 condensation 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. A water leak shows as numerous drops of various sizes collecting on the inside of the lens after the vehicle has been exposed to rain or a car wash.

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   Numerous & Various Size Drops of Water Collecting on the Inside Surface of the Lamp Lens After the Vehicle Has Been Exposed to Rain or a Car Washing Environment

4. The lens or lamp assembly needs service if the condition covers more than half the lens surface.

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   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.

5. An accumulation of water in the bottom of the lamp assembly also indicates the need for service.

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

Caution

• If these 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.

• Non-GM lamp assemblies are most often presented as holding moisture or with inoperative bulbs due to corroded electrical connections.

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  These lamps are most often presented by customers as holding moisture or for inoperative bulbs due to corroded electrical connections.