Part 2

Cleaning the intellibeam digital light sensor should be done periodically to ensure system performance. To clean the sensor, use glass cleaner and a soft cloth. Apply the glass cleaner to a soft cloth and gently wipe the light sensor lens. Do not apply the glass cleaner directly to the light sensor lens.

Note: The intellibeam system operates when the following conditions are met:

* The headlamp switch is in the AUTO position.
* The headlamp dimmer switch must be in the neutral position.
* Intellibeam has been turned ON by pushing the AUTO button located on the face of the rearview mirror.
* Outside conditions must be dark.
* Intellibeam will only function when the vehicle is in DRIVE and moving.

Speed Thresholds:
- Accelerating: As the vehicle is accelerating, intellibeam will gradually apply the high beams when vehicle speed reaches 20 mph (32 km/hr) or greater. Full high beam intensity will not occur until the vehicle has achieved a speed of 25 mph (40 km/hr) or greater.
- Decelerating: As the vehicle is decelerating, intellibeam will fade the high beams down until they are completely OFF at or below 15 mph (24 km/hr).

Note: The high beam indicator located on the instrument panel cluster (IPC) will turn ON as soon as the high beams are energized even thought full intensity has not been achieved. The high beam indicator will not turn OFF until the high beams have faded completely OFF.

Enabling and disabling the intellibeam system can be achieved by performing the following:

* Intellibeam is automatically disabled each time the vehicle is started. To disable intellibeam after the system has been enabled, press the intellibeam AUTO button on the rearview mirror for 3 seconds and releasing it after the green LED intellibeam status indicator on the left side of the rearview mirror flashes 2 times. When this is done, the intellibeam system will not be active until the system is manually turned ON.
* Intellibeam is enabled by pressing and releasing the intellibeam AUTO button located on the rearview mirror after the vehicle has been started. The green LED intellibeam status indicator located on the left side of the rearview mirror will flash 1 time to indicate the system has been turned ON.

Intellibeam Demonstration Mode

The intellibeam demonstration mode allows the technician to verify that the intellibeam system components are operating correctly. Perform the intellibeam demonstration mode under daylight conditions only. The following steps detail how to enter the intellibeam demonstration mode.

1. Turn OFF the ignition.
2. While turning the ignition to the ON position, push and hold the intellibeam AUTO button located on the inside rearview mirror (ISRVM) for approximately 8 seconds after the ignition is turned ON. The high beam indicator located on the instrument panel cluster (IPC) will illuminate indicating the demonstration mode is enabled. The demonstration mode will run for approximately 45 seconds. The following actions will take place during the demonstration mode:

* High Beam Fading - During this mode the high beams will fade from high to low 3 times. The high beam indicator located on the IPC will turn ON as soon as the high beams are energized even thought full intensity has not been achieved. The high beam indicator will not turn OFF until the high beams have faded completely OFF.
* Intellibeam Light Sensor Status - During this mode, the intellibeam light sensor can be checked by covering the light sensor with a dark cloth. Once the light sensor if fully covered, the green LED intellibeam status indicator located on the left side of the ISRVM will turn OFF. When the light sensor is uncovered, the intellibeam status indicator will turn ON. This check will confirm that the intellibeam light sensor is operating correctly.
* Intellibeam Enable/Disable Status - Intellibeam can indicate if the system is enabled or disabled. During the intellibeam light sensor check in step 2 above, if intellibeam is disabled, the green LED intellibeam status indicator will flash repeatedly once the light sensor is covered. Once the light sensor is uncovered, the green LED intellibeam status indicator will turn ON.

HID Headlamps Low Voltage Operation

The instrument panel module (IPM) monitors the vehicle system voltage while in the RUN power mode. When the system voltage drops below 8.9 volts, the following will occur:

STAGE 1: If the low beam headlamps are ON, whether manually or automatically, the IPM will turn ON the high beam headlamps by activating the flash to pass output control and turn OFF the low beam headlamps.

When the system voltage drops below 8.5 volts, the following will occur:

* STAGE 2: If the low beam headlamps are ON, whether manually or automatically the IPM will turn OFF the low beam headlamps by deactivating the low beam relay output.
* If the headlamps are turned ON manually, the manual switch redundancy will cause the low beam headlamps to remain ON.
* If the headlamp dimmer switch is in the HIGH BEAM position, the low beam headlamps will remain ON. The IPM will activate the flash to pass output control.

If during the same ignition cycle the IPM enters either STAGE 1 or STAGE 2 operations noted above, the IPM determines that the system voltage has risen and the following will occur:

* If the IPM has entered STAGE 2 operation, it will not return to STAGE 1 operation until the system voltage rises above 9.4 volts.
* If the IPM has entered STAGE 1 operation, it will not return to normal operation until the system voltage rises above 9.8 volts.

Automatic Headlamp Leveling - European Only

The Automatic Headlamp Leveling systems consist of the following components:

* Headlamp leveling module
* Headlamp leveling actuator - left
* Headlamp leveling actuator - right
* Suspension position sensor - LF
* Suspension position sensor - LR

The automatic headlamp leveling system automatically maintains the vertical alignment of the headlamps when the vehicle load and driving conditions change. The headlamp leveling module receives inputs from the front and rear suspension position sensors to determine vehicle pitch. The suspension position sensors send an output to the headlamp leveling module as the vehicle suspension compresses and rebounds. The headlamp leveling module calculates the difference in vehicle pitch and sends a command to the headlamp leveling actuators. The headlamp leveling actuators drive the headlamps to the position commanded by the headlamp leveling module. The headlamp leveling system also monitors the performance of the high intensity discharge (HID) bulb and ballast. When the headlamp switch is placed in the ON position the headlamps will go down, and then back up to the center position.

Daytime Running Lamps (DRL) - North American/Canadian

The daytime running lamps (DRL) consist of the front turn signal lamps illuminated continuously. The DRLs will operate when the following conditions are met:

* The ignition is in the RUN or CRANK position.
* The shift lever is out of the PARK position.
* The high and low beam headlamps are OFF.
* The park brake is not applied.

When conditions for DRL operation exist, the powertrain control module (PCM) sends a message via GMLAN serial data to the instrument panel module (IPM) indicating the transmission has been removed from the PARK position. The ambient light sensor is a light sensitive transistor that varies its voltage signal to the HVAC control module in response to changes to the outside (ambient) light level. When the HVAC control module receives this signal, it communicates via GMLAN with the IPM. The IPM either turns on the right and left front turn signals for DRL operation or the low beam headlamps for auto headlamp operation depending on outside lighting conditions. Any function or condition that turns the headlamps ON will cancel the DRLs operation.

Daytime Running Lamps (DRL) - Norway/Sweden

The daytime running lamps (DRL) consist of the right and left low beam headlamps illuminated continuously and the park lamps. The DRLs will operate when the following conditions are met:

* The ignition is in the RUN or CRANK position.
* The shift lever is out of the PARK position.
* The high and low beam headlamps are OFF.
* The park lamps are OFF.
* The fog lamps are OFF.
* The park brake is not applied.