Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2015 and earlier GM passenger cars and trucks.

  the passage

  Models: 2015 and Prior GM Passenger Cars and Trucks

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

  the passage

  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.

  the passage

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

• The lamps expel accumulated moisture vapor through a vent system, which works at all times but is most effective with the lamps ON and the vehicle in motion.

  the passage

  They are designed to remove any accumulated moisture vapor by expelling it through a vent system. The vent system operates at all times, however, it is most effective when the lamps are ON and when the vehicle is in motion.

• Non-GM lamp assemblies that look very similar to original equipment are most often presented as holding moisture or with inoperative bulbs due to corroded electrical connections.

  the passage

  Many companies outside of General Motors are manufacturing lamp assemblies that look very similar to original equipment. They target high volume programs like, but not limited to, Impala, Malibu, and Full Size Truck. These lamps are most often presented by customers as holding moisture or for inoperative bulbs due to corroded electrical connections.

Steps to confirm (in the document’s order)

1. The time required to clear the lamp may vary from 2 to 6 hours, depending on the lamp's size, shape and location and the atmospheric conditions.

   the passage

   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.

2. Normal condensation may sit mainly in the lens corners near the vents and should not cover more than half the lens surface.

   the passage

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

3. Normal condensation clears when the vehicle is parked in a dry environment or driven with the lights ON.

   the passage

   • 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.

4. A condition covering more than half the lens surface, or water accumulated in the bottom of the lamp assembly, indicates the lens or lamp assembly needs service.

   the passage

   • A condition that covers more than half the surface of the lamp lens. • An accumulation of water in the bottom of the lamp assembly.

Caution

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

  the passage

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

• A difference between the lamps on opposite sides of the vehicle does not always mean that one lamp is bad and the other is normal.

  the passage

  Note: A different performance of lamps on opposite sides of a vehicle DOES NOT always indicate that one lamp is bad, and the other is normal.

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

  the passage

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