Scan Tool Data Definitions

Scan Tool Data Definitions

Use the Scan Tool Data Display Values and Definitions Information in order to assist in diagnosing vehicle malfunctions. Compare the vehicles actual scan tool data with the typical data display value table information. Use the data information in order to aid in understanding the nature of the problem when the vehicle does not match with the typical data display values.

The scan tool data values were taken from a known good vehicle under the following conditions:

* The ignition switch is in the ON position.
* The engine is not running.
* The vehicle is in PARK.

ALC Headlamp Relay
- This body control module (BCM) output displays the state of the ALC Headlamp Relay. When the proper conditions are present for the BCM to command on the ALC Headlamp Relay by providing ground to the relay, ON is displayed.

ALC Light Sensor
- This BCM input displays the output voltage of the ambient light sensor based on the intensity of light detected. As the light intensity increases, the sensor displayed voltage increases. In the LIGHT state, a high voltage (2.2-4.7 volts) is present and the DRL will be ON. In the DARK state, a low voltage (0.2-1.3 volts) is present and the headlamps will be ON.

ALC Park Relay
- This BCM output displays the state of the ALC Park Relay. When the proper conditions are present for the BCM to command on the ALC Park Relay by providing ground to the relay, ON is displayed.

ALC Switch
- This BCM input displays whether ALC is selected or not. When the headlamp switch is placed in the Auto position, ON is displayed. When the headlamp switch is placed in the Off position, OFF is displayed

Battery 1
- This BCM input displays the output voltage of the vehicle's battery. This parameter is displayed in volts.

Day/Night Status
- The scan tool displays Day/Night. When the daylight conditions are present the scan tool will display Day. When low light conditions are present the scan tool will display Night.

DRL Status
- This body control module input displays the status of the daytime running lamps (DRL).

Fog Lamp Relay
- This BCM output displays the state of the fog lamp relay. When the proper conditions are present for the BCM to command on the fog lamp relay by providing ground to the relay, ON is displayed.

Fog Lamp Switch
- The BCM uses this input to determine if the fog lamps have been requested on. When the fog lamps switch is pressed once, ON is displayed on the scan tool. When the fog lamp switch is pressed again, OFF is displayed.

High Beam Switch
- This BCM input displays the state of the high beam headlamps. When the BCM senses that the normal high beam headlamps are illuminated, the operating voltage of the high beam headlamps is displayed.

Inadvertent Power Command
- This BCM input displays the state of the inadvertent power relay. When the BCM senses that the relay is on, ON is displayed.

Inadvertent Power Input
- This BCM output displays the state of the inadvertent power relay that is internal to the BCM. The BCM uses this output to provide battery voltage to the courtesy lamps. If the BCM senses that a lamp has been illuminated for approximately 20 minutes after exiting the vehicle, the BCM will turn off the inadvertent power relay to protect the battery from run-down.

Interior Lighting Command
- This BCM output displays the amount of dimming of the interior lights. This parameter is displayed as a percentage.

Interior Lighting Relay
- This BCM output displays the state of the Interior Lighting Relay. When the proper conditions are present for the BCM to command on the Interior Lighting Relay by providing ground to the relay, ON is displayed.

Interior Lights
- This BCM input displays the state of the interior lights. When the BCM senses that the interior lights are illuminated, ON is displayed.

I/P Dimmer Input
- The BCM uses this input to determine the request level of the instrument panel dimming lamps. When full intensity is requested the scan tool will display less than 1 volt. When full dim is requested, the scan tool will display approximately battery voltage. The voltage will vary within this range depending on the position of the lamp dimmer switch.

I/P Dimmer Output
- This BCM output displays the amount of dimming based on the position of the I/P Dimmer Switch. This parameter is displayed as a percentage.

LF Turn Signal
- This body control module input displays the state of the left front turn signal. When the BCM senses that the left front turn signal is illuminated, ON is displayed.

Low Beam Switch
- This BCM input displays the state of the low beam headlamps. When the BCM senses that the normal low beam headlamps are illuminated, the operating voltage of the low beam headlamps is displayed.

LR Turn Signal
- This body control module input displays the state of the left rear turn signal. When the BCM senses that the left rear turn signal is illuminated, ON is displayed.

Park Lamp Switch
- This BCM input displays the state of the park lamps switch. When the BCM senses that the park lamps are illuminated, ON is displayed.

RF Turn Signal
- This BCM input displays the state of the right front turn signal. When the BCM senses that the right front turn signal is illuminated, ON is displayed.

RR Turn Signal
- This BCM input displays the state of the right rear turn signal. When the BCM senses that the right rear turn signal is illuminated, ON is displayed.

Turn/Hazard Input
- The BCM uses this input to determine if the turn or hazard lamps have been requested on. When the turn signal or hazard lamps have been activated, ON is displayed on the scan tool.