Low Tire Pressure Indicator Always On

Low Tire Pressure Indicator Always On

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The remote control door lock receiver (RCDLR) sends a serial data message to the instrument panel cluster (IPC) requesting low tire pressure indicator illumination.

Special Tools Required

J-46079 Tire Pressure Monitor Diagnostic Tool

Circuit/System Testing

1. Inflate tires to the proper pressure. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label.
2. Using the tire pressure monitor (TPM) special tool, activate each tire pressure sensor and record each sensors tire pressure reading in psi. Check tire pressures with a known accurate hand held tire pressure gauge. Verify pressure readings from special tool do not differ 4 psi or more lower than actual tire pressure.

- If 4 psi or more lower than actual tire pressure, replace the suspect tire pressure sensor.

3. With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel warning lamps OFF. Verify low tire pressure indicator lamp turns OFF.

- If the lamp does not turn OFF, replace the IPC.

4. Enable the TPM learn mode. Use the TPM special tool in simulate mode to learn 4 simulated sensor transmissions into the RCDLR. Observe tire pressures in the scan tool data display. Verify simulated tire pressures do not differ more than +/- 4 psi of the scan tool reading.

- If the tire pressures differ more than +/- 4 psi, replace the RCDLR.

Repair Instructions

* Tire Pressure Indicator Sensor Replacement (Snap In Style)
* Control Module References for IPC or RCDLR replacement, setup, and programming

Repair Verification

1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming or setup procedures that are required when a component or module is removed or replaced. This would include the Tire Pressure Sensor Learn procedure.
3. Clear the DTCs.
4. Turn OFF the ignition for 60 seconds.
5. Turn ON the ignition.
6. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure. Diagnostic Trouble Code Descriptions