Prowler V6-3.5L VIN G (1999)
Low Tire Pressure Indicator: Description and Operation
Low Tire Pressure Warning Lamp And Warning Tone
The "Low Tire" Pressure Warning Lamp is located in the instrument cluster and is displayed as "Low Tire". The lamp is used to inform the driver
that one or more of the tires have low air pressure. The "Low Tire" lamp is controlled by the LTPW module indirectly through the Body Control
Module (BCM). The BCM controls the "Low Tire" lamp by communicating with the instrument cluster via the CCD Bus. The instrument cluster
control the "Low Tire" lamp by directly grounding the lamp. When the ignition is turned on, the LTPW module grounds the LTPW Lamp Signal
Circuit for two seconds. The BCM will then illuminate the "Low Tire" lamp for 2 seconds signifying that the system is operational. If the BCM
does not sense that the LTPW module has provided a ground path after initial ignition on, or the LTPW module has set a DTC and is keeping the
Low Tire Pressure Warning Signal Circuit grounded, the BCM will set the "Tire Pressure Input Circuit Fault" DTC. The BCM will turn the "Low
Tire" lamp on and it will stay on, signifying a problem with the LTPW system.
The transmitters will only send out tire pressure information when the vehicle speed is above approximately 33 km/h (20 mph). When the
transmitter senses that pressure is below one or two calibrated thresholds, Low pressure or Critical pressure, the LTPW module will set a DTC,
and will indirectly operate the "Low Tire" lamp and the chime tone through the BCM.
If the tire pressure is low, the low tire pressure warning lamp signal circuit will be pulsed to ground by the LTPW module for two seconds on and
then two seconds off. The BCM will then illuminate the "Low Tire" lamp at the same rate and operate the chime tone for one single long tone.
If the tire pressure is critical, the low tire pressure warning lamp signal circuit will be pulsed to ground by the LTPW module for one second on
then one second oft. The BCM will then illuminate the "Low Tire" lamp and sound the chime tone at the rate of one second off and one second
on.
The module will continue to pulse to ground the low tire pressure warning lamp signal circuit until the ignition is turned off, or the tire pressure
transmitter(s) transmits a pressure above the calibrated threshold.
NOTE: A low tire pressure condition does not set a DTC. The DRB can be used to view the last 32 transmissions in the module's memory and to
confirm which tire was reporting the low pressure condition.
If more than one condition is set at the same time, the LTPW module will prioritize how the "Low Tire" lamp will be illuminated. The priority
rankings are listed below.
Critical Pressure - Lamp flashes at one second on and one second off
-
Critical tire pressure 131 kPa (19 psi)
Low Pressure - Lamp flashes at two seconds on and two seconds off
-
Low Tire Pressure 165 kPa (24 psi)
LTPW Module Failure (DTC) - Lamp on steady
Tire Pressure Sensor/Transmitter(DTC) - Lamp on steady
Less than four transmitter IDs learn - Lamp on steady
Critical tire pressure is zero - Lamp on steady
Normal tire pressure - No lamp
No faults - No lamp
Low Tire Pressure Codes
-
Left Front Low Tire Pressure
-
Left Rear Low Tire Pressure
-
Right Front Low Tire Pressure
-
Right Rear Low Tire Pressure
-
Left Front Tire Pressure Transmitter Low Battery
