The lift gate module (LGM) 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

Scan Tool Reference

Special Tools

J-46079 Tire Pressure Monitor Diagnostic Tool

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

⇒	If the lamp does not turn ON, replace the IPC.

2. Using the tire pressure monitor (TPM) special tool to observe the tire pressure of the suspected faulty sensor. Check air pressure with a known accurate hand held tire pressure gage. Compare the psi reading to the display on the TPM special tool. Verify pressure readings from special tool do not differ 2 psi or more than actual tire pressure.

⇒	If the difference is 2 psi more, replace the suspect tire pressure sensor.

3. With the scan tool, observe tire pressures in the scan tool data display. Verify pressure readings from special tool do not differ 2 psi or more than scan tool data display.

⇒	If the difference is 2 psi more, replace the LGM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.