Part 2

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.

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 DRLs using a reduced output or the low beam headlamps at full intensity for auto headlamp operation. Any function or condition that turns the headlamps ON will cancel the DRLs operation. The DRLs consists of the low beam headlamps. With the headlamp switch in the OFF position, the headlamps will either be turned ON or OFF, after an approximate 8 second delay depending on whether daylight or low light conditions are sensed.

Twilight Sentinel

Twilight sentinel is a driver convenience that controls the exterior lamps in response to changes to the outside, ambient light level. The twilight sentinel will also keep the low beam headlamps and park lamps ON for a pre-selected period of time after the ignition is turned to the OFF position when night time conditions are sensed. The twilight delay is programmable through the driver information center (DIC) for Driver 1 and Driver 2.

* 0 seconds
* 15 seconds
* 30 seconds
* 60 seconds
* 90 seconds
* 120 seconds
* 180 seconds
* 240 seconds

The DIC will enable the park/headlamp delay feature under the following conditions:

* The time delay is programed to 15 seconds or more for the current driver.
* The headlamp switch is in the auto position.
* The automatic headlamp feature has not been canceled.
* The ambient light sensor status is night time.
* The ignition is OFF.

The delay timer starts once the ignition is turned OFF. The lights will not turn OFF until the set time has been completed or the keyless entry system receives a request for door unlock or trunk release.

Front Fog Lamps

With the ignition switch in the ON or START position, the front fog lamps will illuminate when the driver toggles the front fog lamp switch to the ON position. The front fog lamp switch is a momentary switch that requires the driver to briefly place the front fog lamp switch to the ON position and release it. The instrument panel module (IPM) controls the front fog lamp relay coil. When the driver toggles the front fog lamp switch to the ON position, the switch supplies ground to the front fog lamp switch signal circuit of the IPM. In response to this input, the IPM supplies ground to the front fog lamp relay control circuit. The underhood fuse block supplies battery positive voltage to the switch circuit of the front fog lamp relay. Ignition voltage is available to the front fog lamp relay coil when the key is in the RUN or CRANK positions. When the IPM grounds the front fog lamp relay control circuit the relay coil energizes, closing the switch contacts. Current then flows from the fog lamp fuse through the front fog lamp relay switch to both front fog lamps. Both front fog lamps are permanently grounded. The front fog lamps will default to the OFF position upon a key cycle.

The IPM will turn the park lamps ON when the front fog lamps are ON and send a message via GMLAN serial data to the instrument panel cluster (IPC) to enable the front fog lamp indicator. The front fog lamps will deactivate when either the flash-to-pass or the high beam headlamps are turned ON. For vehicles exported to Japan or any European Country except Norway or Sweden, the front fog lamps will remain illuminated with the operation of the high beam headlamps or flash-to-pass.