TIRE PRESSURE WARNING SYSTEM

General

1. A direct-sensing type tire pressure warning system is used. This tire pressure warning system receives tire pressure signals from all 5 tires.*

   
   

   • *: Models with full size spare tire (models with puncture repair kit have 4 tire pressure warning valve and transmitters).

2. When the tire pressure warning system detects that the tire pressure becomes lower than the warning threshold, it will turn on the tire pressure warning light and display a warning message on the multi-information display to warn the driver.

3. The tire pressure warning antenna receives the tire pressure, temperature, and ID code information from the 5 tire pressure warning valve and transmitters and transmits this information to the tire pressure warning ECU and receiver.*

   
   

   • *: Models with full size spare tire (models with puncture repair kit have 4 tire pressure warning valve and transmitters).

4. The tire pressure warning ECU and receiver monitors the tire pressure warning valve and transmitters to detect the low tire pressure of all 5 tires.*

   
   

   • *: Models with full size spare tire (models with puncture repair kit have 4 tire pressure warning valve and transmitters).

5. The operation of the tire pressure warning system includes a tire inflation pressure display function, warning function, initial check function, initialization function and diagnosis function.

6. The transmission cycle with which the information is sent from the tire pressure warning valve and transmitter to the tire pressure warning ECU and receiver is determined as follows based on the travel mode and the acceleration sensor built into each tire pressure warning valve and transmitter. Since the acceleration sensor is used only to determine if the vehicle is being driven, the value of rotational acceleration is not sent to the tire pressure warning ECU and receiver.

   Travel Mode	Transmission Cycle
   While stopping*1	1 time / 1.5 min.
   While traveling*2	4 times / 1 min.

   Tech Tips

   *1: When G that is applied to the acceleration sensor is less than 8 G.

   *2: When G that is applied to the acceleration sensor is 8 G or greater.

7. The warning threshold changes in accordance with pressure changes caused by driving conditions during initialization. Therefore, when a decreased tire pressure warning is displayed, the warning may not stop even though the tire pressure has been adjusted to the recommended pressure. At that time, initialization is necessary.

System Diagram

Layout of Main Components

*A	Models with Full Size Spare Tire	-	-
*1	Tire Pressure Warning Front Antenna	*2	Tire Pressure Warning Valve and Transmitter (Front LH)
*3	Tire Pressure Warning Valve and Transmitter (Rear LH)	*4	Tire Pressure Warning Valve and Transmitter (Spare Tire)
*5	Tire Pressure Warning Valve and Transmitter (Rear RH)	*6	Tire Pressure Warning Roof Antenna
*7	Tire Pressure Warning ECU and Receiver	*8	Tire Pressure Warning Valve and Transmitter (Front RH)

*1	Combination Meter Tire Pressure Warning Light Multi-information Display	*2	Main Body ECU (Cowl Side Junction Block LH)
*3	Tire Pressure Warning Reset Switch	*4	DLC3

Function of Main Components

Diagnosis

1. If the tire pressure warning ECU and receiver detects a malfunction in the system, the tire pressure warning ECU and receiver will make the tire pressure warning light blink at 1 Hz for 1 minute and then remain on to warn the driver. It will also store the Diagnostic Trouble Code (DTC) in memory.

2. 5-digit DTC can be read by connecting a Global TechStream (GTS) to the DLC3. For details, refer to the Repair Manual.

Operation Precautions

1. The system will be disabled in the following conditions: (When the condition becomes normal, the system will work properly.)

   
   

   1. If tires not equipped with the tire pressure warning valve and transmitters are used.

   2. If the ID code on the tire pressure warning valve and transmitters are not registered in the tire pressure warning ECU and receiver.

   3. If the tire pressure is 380 kPa (55 psi, 3.9 bar) or higher.

   4. If the tire pressure warning valve and transmitter battery voltage drops. (Battery life: approximately 10 years)

2. The system may be disabled in the following conditions: (When the condition becomes normal, the system will work properly.)

   
   

   1. If electronic devices or facilities using similar radio wave frequencies are nearby.

   2. If a wireless device or other equipment operating at similar frequencies is in use in the vehicle.

   3. If a window tint that affects the radio wave signals is installed.

   4. If there is a lot of snow or ice on the vehicle, in particular around the wheels or wheel housings.

   5. If non-genuine wheels are used.

   6. If tire chains are used.

   7. If a tire repair sealant is used.

   8. If the spare tire is in a location subject to poor radio wave signal reception.*

      
      

      • *: Models with full size spare tire

   9. If a large metallic object which can interfere with signal reception has been put in the luggage compartment.*

      
      

      • *: Models with full size spare tire

3. The tire pressure warning system may not function properly if a tire repair sealant has been used to repair a flat tire. If this type of sealant has been used, the tire pressure warning valve and transmitter should be replaced with a new one after repairing or replacing the tire.

4. The tire pressure warning light may illuminate due to natural pressure loss caused by air passing through the tires or by changes in tire pressure caused by temperature fluctuations. When adjusting tire pressure, please be aware of the driving conditions and temperature conditions. The tire pressure warning light is prone to illuminate especially in late fall and during winter.