Envoy 2WD V6-4.3L VIN W (1998)
The following conditions exist if the ignition switch is in the OFF position and the park brake is set:
^
The DRLs are OFF.
^
The park lamps are OFF.
^
The headlamps are OFF.
If you turn the ignition switch to the RUN position, the auto headlamps are defeated. If you release the park brake, the auto headlamps will function. If
you set the park brake again, the headlamp function will not change.
If the headlamp switch is in the AUTO position and the ambient light level conditions change to LIGHT for 20 seconds, the BCM will turn OFF the
headlamps.
Door Lock/Unlock Switch Function
The driver door LOCK/UNLOCK switch and the passenger door LOCK/UNLOCK switch are inputs to the BCM. The BCM will command the driver
door unlock relay to unlock the drivers door according to the state of the relevant switch.
Driver Warning Telltales
The BCM sends requests to the IP cluster in order to turn the IPC telltales ON or OFF. These requests are sent on the Class 2 serial data line. If the
IPC cannot communicate with the BCM via Class 2, the IPC will turn the security telltale ON steady.
The following messages are sent by the BCM to the IPC:
^
Gate ajar (utility only)
^
Over speed (export only)
^
Park brake
^
Seat belt
^
Security light
^
Turn signal reminder
^
High beam ON indicator
Exit Lighting
The interior lights will illuminate for 40 seconds when the ignition key is removed from the ignition cylinder.
Front Fog Lamps
The front fog lamps are a controlled option of the BCM. The BCM will command the fog lamp relay ON if the following actions occur:
^
The park lamps are ON.
^
The high beams are OFF.
^
You press the fog lamp switch.
The front fog lamp relay will turn the front fog lamps ON. The front fog lamp switch is a momentary switch. Only one transition occurs each time the
front fog lamp switch is pressed. Press the front fog lamp switch in order to turn ON the front fog lamps. Toggle the HIGH/LOW beam switch in order to
toggle the front fog lamps ON/OFF.
Illuminated Entry
The interior lights will illuminate for 15 seconds if any of the following actions occurs:
^
For utility only, lift and release the driver door handle.
^
For utility only, lift and release the passenger side door handle.
^
Open and close the driver side door.
^
Open and close the passenger side door.
Inadvertent Power Relay
The BCM turns OFF the inadvertent power relay after 20 minutes in order to preserve the battery power.
The 20 minute timer starts after any one of the following actions occurs:
^
The ignition switch is turned from RUN or START to UNLOCK, LOCK or ACC.
^
The illuminated entry is activated.
^
The interior lamps switch is turned ON.
^
The lift glass is opened or closed.
^
The underhood lamp is activated.
^
The vanity lamp is activated.
^
The courtesy lamp is activated.
^
The dome lamp is activated.
^
The glove compartment lamp is activated.
^
The reading lamp is activated.
^
The inside rear view mirror lamp is activated.
If any one of the following inputs reoccur during the 20 minute timer period, the timer is reset to 20 minutes:
^
The ignition switch is turned from RUN or START to UNLOCK, LOCK or ACC.
^
The illuminated entry is activated.
