Hombre S Regular Cab 4WD V6-4.3L (1999)
Data
Dimming Potentiometer
Range: 0.0 - 18.0 volts
The voltage value displayed indicates the position of the dome lamp switch (thumb wheel). Zero (0) volts will be displayed when the following
conditions exist:
-
The headlamp switch is in the AUTO position.
-
The daytime running lamps are OFF.
10.5 volts will be displayed when the following conditions exist:
-
The park lamps or the headlamps are turned ON.
-
The dome lamp switch is in the FULL bright position (thumb wheel turned completely up just before the detent).
0.1 volts will be displayed if the following conditions exist:
-
The park lamps or the headlamps are turned ON.
-
The dimmer switch is in the FULL DIM position (thumbwheel turned completely down).
The dimming potentiometer voltage will change as the dome lamp switch is moved between FULL BRIGHT and FULL DIM. The voltage value
displayed should vary between 0.1 - 12.7 volts depending on the position of the dome lamp switch.
Battery Voltage
Range: 0 - 18.0 volts
The voltage value displayed refers to the battery system voltage measured by the BCM.
Ambient Light Sensor
Range: 0 - 5.0 volts
The displayed voltage value refers to the amount of ambient light level as measured by the light sensor. This information is used by the BCM in order to
operate the automatic headlamp feature and the daytime running lamps (DRL) feature. The BCM supplies 5 volts to the ambient light p
hotocell sensor and receives a return signal voltage from the ambient light photocell on the return signal circuit. The ambient light sensor internal
resistance changes with different levels of ambient light. In LIGHT ambient conditions, the resistance is low. In DARK ambient conditions, the
resistance is High.
The BCM interprets the following conditions as LIGHT:
-
The ambient light sensor is exposed to bright ambient light (low resistance).
-
High voltage (2.2 - 4.7 volts) is present on the return circuit.
The BCM interprets the following conditions as DARK:
-
The ambient light sensor is exposed to dark ambient light.
-
Internal resistance increases.
-
The return signal voltage decreases (0.2 - 1.3 volts).
If there is an open or a short to ground in the ambient light Sensor Circuit, the sensor will read about 0.0 volts. The BCM will default into a DARK state
and turn ON the headlamps.
If the headlamps are set to the AUTO position while in the LIGHT state and the ambient light level conditions change to DARK for 15 seconds, the
BCM will turn ON the headlamps.
If the headlamps are set to the AUTO position while the DARK state and the ambient light level conditions change to LIGHT for 20 seconds, the BCM
will turn the headlamps OFF.
Ambient Light
Range: Light/Dark
The displayed value refers to the amount of ambient light level calculated by the BCM using the light sensor.
The information is used by the BCM for operation of the following features:
-
The automatic headlamp feature
-
The daytime running lamps (DRL) feature
The BCM supplies 5 volts to the ambient light photocell sensor and receives a return signal voltage from the ambient light photocell sensor on the return
