Lexus ES: Diagnosis System
DIAGNOSIS SYSTEM
CHECK WARNING LIGHT
NOTICE:
- When there is a problem with the tire pressure warning system, the tire pressure warning light blinks at 0.5 second intervals, and illuminates after 1 minute.
- When the malfunction has been corrected, the tire pressure warning light goes off.
- When the tire pressure warning light illuminates, immediately check the tire pressure of the tires and adjust them to the specified value.
-
After the engine switch is turned on (IG), the tire pressure warning light illuminates for 3 seconds and then goes off. If the warning light does not illuminate for 3 seconds, proceed to the troubleshooting for the tire pressure warning light circuit.
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(a) Turn the engine switch on (IG).
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| *1 | Tire Pressure Warning Light |
(b) Check that the tire pressure warning light illuminates for 3 seconds.
WHAT TO CONSIDER WHEN TIRE PRESSURE WARNING LIGHT ILLUMINATES
(a) When the tire pressure warning light does not go off, or when it illuminates during driving, check the tire pressure. If the tire pressure warning light illuminates within several hours after adjusting the tire pressure, a tire may have a slow air leak.
(b) The system is disabled under the following conditions (when the condition returns to normal, the system will work properly).
(1) When all of the tire and wheel assemblies that have tire pressure warning valve and transmitters registered with the tire pressure warning ECU and receiver have not been installed.
(2) When all of the transmitter ID codes are not registered with the tire pressure warning ECU and receiver.
(3) When the tire pressure warning valve and transmitter battery is depleted (Battery life is 10 years).
(c) The system may become disabled under the following conditions (when the condition returns to normal, the system will work properly).
(1) When electric devices or facilities using similar radio frequencies are nearby.
(2) When a wireless device or other equipment operating at a similar frequency is in use in the vehicle.
(3) When a window tint that affects radio wave signals is installed.
(4) When there is a lot of snow or ice on the vehicle, in particular, around the wheels or wheel housing.
(5) When non-genuine wheels are used.
(6) When tire chains are used.
(7) When aftermarket tire repair sealant is used.
CAUTION:
After use of tire repair sealant, replacement of the tire pressure warning valve and transmitter is required to ensure normal system operation. (Normal system operation cannot be ensured by only repairing or replacing the tire.)
TIRE PRESSURE WARNING LIGHT AND INDICATOR CHART
HINT:
The table below indicates the state of the tire pressure warning light after the engine switch is turned on (IG).
| Immediately after turning the engine switch on (IG) | Always | |||||
|---|---|---|---|---|---|---|
| Warning light output pattern | Multi-information Display Condition | |||||
| Illuminates for 3 sec. | Illuminates for 4 sec. | Goes off | Illuminates | Blinks | Displays | |
| Normal | ○ | - | ○ | - | - | - |
| Low tire pressure | ○ | - | - | ○ | - | Tire Pressure Low Check Tire |
| System failure | ○ | - | - | - | *1 | TPWS Malfunction Visit Your Dealer HINT:
|
| Test mode (signal check mode) | ○ | - | - | - | *2 | - |
| Tire pressure initialization | - | ○ | ○ | - | *3 | Setting Tire Pressure Warning System |
| Tire position identification in progress | ○ | - | ○ | - | - | - |
| ECU connector poorly connected | - | - | - | - | *4 | - |
| ID certification, automatic ID registration | ○ | - | - | - | *1 | Tire Pressure Recalibrating Please Wait until Complete |
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*1: Blinks at 0.5 second intervals, and remains illuminated after 1 minute.
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*a
ON
*b
OFF
*c
0.5 sec.
*d
1 minute
-
*2: Blinks at 0.125 second intervals.
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*a
ON
*b
OFF
*c
0.125 sec.
-
*3: Blinks 3 times at 1 second intervals.
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*a
ON
*b
OFF
*c
1 sec.
-
*4: Goes off for 10 seconds to check the connection of the ECU connector, and then blinks at 0.5 second intervals, and remains illuminated after 1 minute.
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*a
ON
*b
OFF
*c
0.5 sec.
*d
1 minute
*e
10 sec.
NORMAL MODE DTC
(a) DTCs are stored in the tire pressure warning ECU and receiver and output by blinking the tire pressure warning light or by using the Techstream.
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TEST MODE (SIGNAL CHECK MODE) DTC
(a) By switching from normal mode into test mode (signal check mode), the tire pressure warning ECU and receiver, each tire pressure warning valve and transmitter and tire pressure warning reset switch can be inspected.
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READ NEXT:
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (for TIRE PRESSURE WARNING ECU AND RECEIVER) (a) Turn the engine switch off. (b) Connect the Techstream to the DLC3. (c) Turn the engine switch on (IG). (d) Turn the Techst
Fail-safe Chart
FAIL-SAFE CHART FAIL-SAFE FUNCTION (a) When a malfunction occurs in the tire pressure warning system, the tire pressure warning light illuminates after blinking for 1 minute to inform the driver of th
Data List / Active Test
DATA LIST / ACTIVE TEST READ DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any part
SEE MORE:
Installation
INSTALLATION PROCEDURE 1. INSTALL FUEL PUMP CONTROL ECU BRACKET (a) Install the fuel pump control ECU bracket to the fuel pump control ECU with the 2 bolts. Torque: 4.5 N·m {46 kgf·cm, 40 in·lbf} 2. INSTALL FUEL PUMP CONTROL ECU (a) Install the fuel pump control ECU to the vehicle body with the
Parts Location
PARTS LOCATION ILLUSTRATION *1 TELEPHONE MICROPHONE ASSEMBLY *2 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECU-ACC FUSE - ECU-IG1 NO. 4 FUSE - ECU-IG2 NO. 3 FUSE (w/ Manual (SOS) Switch) - PANEL FUSE - ECU-DCC NO. 2 FUSE - METER-IG2 FUSE - ECU-B NO. 2 FUSE - DCM FUSE (w/ Manual (SOS) Switc
