Last Modified: 4-30-2014 6.6 D Doc ID: RM0000018L4001X
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: DIAGNOSIS SYSTEM; 2006 MY LX470 [05/2005 -        ]

DIAGNOSIS SYSTEM

1. CHECK DLC3

The ECM uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

Verify conditions listed in table below

Symbols (Terminals No.)

Terminal Description

Condition

Specified Condition

SIL (7) - SG (5)

Bus '+' line

During transmission

Pulse generation

CG (4) - Body ground

Chassis ground

Always

Below 1 Ω

SG (5) - Body ground

Signal ground

Always

Below 1 Ω

16

Battery ground

Always

11 to 14 V
  • If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

HINT:

Connect the cable of the intelligent tester to the DLC3, turn the ignition switch ON and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem wither with the vehicle or with the tester.

  • If communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle.
  • If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tester itself, so consult the Service Department listed in the tester's instruction manual.

2. DIAGNOSIS SYSTEM

(a) Warning light

(1) The tire pressure warning light blinks when there is any malfunction in the tire pressure warning system.

NOTICE:

When the malfunction has been corrected, the tire pressure warning light does not come on.

(b) DTCs (Normal mode)

(1) DTCs are memorized in the tire pressure monitor ECU. These DTCs can be read by checking the blinks of the tire pressure warning light or by using the intelligent tester 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: DTC CHECK / CLEAR .

(c) Test mode

(1) By switching from normal mode to test mode (input signal check), you can inspect the tire pressure monitor receiver assembly, each tire pressure monitor valve sub-assembly and vehicle speed sensor 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: TEST MODE PROCEDURE .

3. CHECK WARNING LIGHT

(a) Turn the ignition switch ON.

(b) Check that the tire pressure warning light comes on for 3 seconds.

If the warning check result is not normal, proceed to the troubleshooting for the tire pressure warning light circuit.

Trouble Area

See page

Tire pressure warning light circuit

2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: Tire Pressure Warning Light Circuit

4. TIRE PRESSURE WARNING LIGHT CHART

HINT:

The table below indicates the state of the tire pressure warning light after the ignition switch is turned ON.

 

Immediately after turning the ignition switch ON

Always

Warning light output pattern

Comes on for 3 sec.

Goes off

Comes on

Blinks

(*1)

Blinks

(*2)

Blinks

(*3)

Normal

○

○

        

Low tire pressure

○

  

○

      

System fail

○

    

○

    

Test mode

○

      

○

  

Initialization

○

        

○

ECU connector poorly connected

    

○

      

TC ground

○

          
  • *1: Comes on and goes off repeatedly at 0.5 second intervals.
  • *2: Comes on and goes off repeatedly at 0.125 second intervals.
  • *3: Blinks 3 times (1 second on, 1 second off).