Low Tire Pressure Indicator Always on

Low Tire Pressure Indicator Always On

Diagnostic Fault Information
Perform the [Diagnostic System Check - Tire Pressure Monitoring] prior to using this diagnostic procedure.

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.

Description and Operation
[Tire Pressure Monitor Description and Operation]

Electrical Information Reference
- [Circuit Testing]
- [Testing for Intermittent Conditions and Poor Connections]
- [Wiring Repairs]
- [Connector Repairs]

Scan Tool Reference
- [Scan Tool Output Controls - Tire Pressure Monitoring]
- [Scan Tool Data List - Tire Pressure Monitoring]
- [Scan Tool Data Definitions - Tire Pressure Monitoring]

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
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information] after completing the diagnostic procedure.
- [Tire Pressure Sensor Learn]
- [Control Module References] for IPC or RCDLR replacement, setup, and programming