Chevrolet Silverado / GMC Sierra. Service manual — part 2779

SUNROOF MOTOR/ACTUATOR INITIALIZATION/TEACH PROCESS (EXTENDED CAB NEW
NEW MOTOR)

Perform the Initialization/Teach Procedure any time a new sunroof motor/actuator is installed in
the vehicle.

Callout

Component Name

1

Sunroof Panel/Window Garnish Molding Assembly
Tip:

1. Tilt molding approximately 45 degrees with rear end up.

2. Push molding rearward to sandwich headliner and sunroof tub between

molding flange and tabs.

3. Grab front of molding at centerline and pull rearward approximately 1

inch.

4. Push front edge up, locking front tabs in place.

5. Push up on outboard edges of molding to secure.

6. After molding is secured, slide the molding forward until it stops.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Sunroof - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 28: Identifying Sunroof Motor/Actuator (New Style MD4)
Courtesy of GENERAL MOTORS CORP.

1. Press and hold the open switch until the glass panel stalls at the hard stop, then moves

slightly forward. This position is called the soft stop or full open position.

2. Release the switch.

3. Press and hold the open switch within 6 seconds.

4. Hold the open switch until the glass panel moves to the closed position and stops.

5. Release the switch.

SUNROOF MOTOR/ACTUATOR INITIALIZATION/TEACH PROCESS (EXTENDED CAB
EXISTING MOTOR)

Perform the Initialization/Teach Procedure any time a new sunroof motor/actuator is installed in

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Sunroof - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

the vehicle.

Fig. 29: Identifying Sunroof Motor/Actuator (New Style MD4)
Courtesy of GENERAL MOTORS CORP.

1. Press and hold the open switch until the full open position.

2. Release the switch.

3. Press and hold the open switch for 10 seconds or more. The glass panel will move further

rearward of the open position, stall at the hard stop, and move back slightly to the soft stop
or full open position.

4. Release the switch

5. Press and hold the open switch within 6 seconds.

6. Hold the open switch until the glass panel moves to the closed position and stops.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Sunroof - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

7. Release the switch.

SUNROOF MOTOR/ACTUATOR INITIALIZATION/TEACH PROCESS (CREW CAB EXIST
EXISTING MOTOR)

Re-Initialization/Teach Procedure (Manual Method), possible Re-Installation

Perform the initialization/teach procedure at the first operation test of the sunroof. Ensure the
electrical harness on the headliner is connected to the large roof, battery power is applied and the
ignition switch is on.

1. Press the sunroof switch to the VENT OPEN position until the window reaches the vent

open soft stop position and release. Press the sunroof switch - vent open and hold for
approximately 10 seconds, until the window stalls at the front hard stop in the vent open
position, and then moves slightly to the soft stop position. Release the button. (This is the re-
initialization portion.)

Continue with steps 2-4.

2. Within 3 seconds, press and hold the sunroof switch-vent open again. The sunroof window

will move toward and past the flush position. (This is the teach portion.)

3. Continue holding the switch until the sunroof window moves to full open and then back to

close and stops at the closed position. Release the button. The initialization/teach procedure
is complete.

4. Verify the operation of the roof.

The initialization/teach procedure is not completed if one of the following events occurs before
the initialization/teach cycle is finished:

The sunroof switch is not held in the VENT OPEN position.

Ignition and/or battery power has not been removed.

Glass panel has not reached the CLOSE position.

If the initialization/teach procedure is not carried out completely, it must be started again.

SUNROOF MOTOR/ACTUATOR INITIALIZATION/TEACH PROCESS (CREW CAB NEW
MOTOR)

Initialization/Teach Procedure (Manual Method), New/First Time Installation

Perform the initialization/teach procedure at the first operation test of the sunroof. Ensure the

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Sunroof - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado