Low Tire Pressure Warning Lamp Stays On When Ignition Switch Is Turned On

TROUBLE DIAGNOSIS FOR SYMPTOMS

Low Tire Pressure Warning Lamp Stays On When Ignition Switch Is Turned On

NOTE:
The Signal Tech II Tool (J-50190) can be used to perform the following functions. Refer to the Signal Tech II
User Guide for additional information.
- Activate and display TPMS transmitter IDs
- Display tire pressure reported by the TPMS transmitter
- Read TPMS DTCs
- Register TPMS transmitter IDs

1. CHECK BCM CONNECTORS

1.Turn ignition switch OFF.
2.Disconnect BCM harness connectors M18 and M20.
3.Check terminals for damage or loose connections.
Inspection results OK?
OK- GO TO 2.
NG- Repair or replace damaged parts.

2. CHECK BCM POWER SUPPLY CIRCUIT (BAT)

Check voltage between BCM harness connector M20 terminal 70 and ground.

OK or NG
OK- GO TO 3.
NG- Check BCM power supply circuit for open or short.

3. CHECK BCM POWER SUPPLY CIRCUIT (IGN)

1.Turn ignition switch ON.
2.Check voltage between BCM harness connector M18 terminal 38 and ground.

OK or NG
OK- GO TO 4.
NG- Check BCM power supply circuit for open or short.

4. CHECK BCM GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Check continuity between BCM harness connector M20 terminal 67 and ground.

OK or NG
OK- Replace BCM. Service and Repair.
NG- Repair BCM ground circuit.