Cherokee 4WD LHD L6-4.0L VIN S (2001)
Seat Belt Reminder Lamp: Description and Operation
SEATBELT WARNING INDICATOR
A seatbelt indicator is standard equipment on all instrument clusters. The seatbelt indicator lamp is located near the center of the instrument cluster
overlay, directly below the headlamp high beam indicator and above the odometer/trip odometer Vacuum-Fluorescent Display (VFD). The
seatbelt indicator consists of an International Control and Display Symbol icon for "Seat Belt." This icon is a stenciled cutout in the opaque layer
of the instrument cluster overlay. The dark outer layer of the overlay prevents the icon from being clearly visible when the lamp is not illuminated.
A red lens behind the cutout in the opaque layer of the overlay causes the icon to appear in red through the translucent outer layer of the overlay
when it is illuminated from behind by a replaceable incandescent bulb and bulb holder unit located on the instrument cluster electronic circuit
board. The seatbelt indicator is serviced as a unit with the instrument cluster.
The seatbelt indicator lamp gives an indication to the vehicle operator after the ignition switch is turned to the ON or Start positions, regardless of
whether the seatbelts have been fastened. This lamp is controlled by the instrument cluster circuit board based upon the cluster programming. The
seatbelt indicator lamp bulb receives battery current on the instrument cluster electronic circuit board through the fused ignition switch output
(st-run) circuit whenever the ignition switch is in the ON or Start positions; therefore, the lamp will always be OFF when the ignition switch is in
any position except ON or Start. The lamp bulb only illuminates when it is switched to ground by the instrument cluster circuitry. The instrument
cluster will turn ON the seatbelt indicator lamp for the following reasons:
-
Ignition Switch In ON or Start Position - Each time the cluster receives a battery current input on the fused ignition switch output (st-run)
circuit. The lamp remains illuminated until about seven seconds have elapsed or until the ignition switch is turned to the OFF position,
whichever occurs first.
-
Actuator Test - Each time the cluster is put through the actuator test, the lamp will be turned ON and OFF in a prescribed sequence to confirm
the functionality of the lamp and the cluster circuitry.
If the seatbelt indicator fails to light when the ignition switch is turned to the ON or Start positions, replace the bulb with a known good unit. For
further diagnosis of the seatbelt indicator lamp or the instrument cluster circuitry that controls the lamp, (Refer to INSTRUMENT CLUSTER -
DIAGNOSIS AND TESTING).
