Lexus ES manuals

Lexus ES: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

  • If CAN communication system and lane control system DTCs are not output and any of the following problem symptoms exist, perform troubleshooting by checking the appropriate suspected areas in the order they are listed.
  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Lane Control System

Symptom

Suspected Area

Link

Lane control system cannot be enabled

Steering pad switch circuit

Adjust forward recognition camera

HINT:

Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

*1

*2

The LTA indicator does not illuminate when the LTA main switch is operated.

Indicator circuit

Steering pad switch circuit

Combination meter assembly

The LTA indicator does not turn off even when the LTA main switch is operated.

Indicator circuit

Steering pad switch circuit

Combination meter assembly

Increase in cases that driver can see lane markers but system cannot detect lane markers

Check if operating conditions are met

Adjust forward recognition camera

HINT:

Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

*1

*2

Lane control system is operating, but system operation is not displayed on multi-information display

Data List/Active Test

(LDA Control)

Combination meter assembly

Buzzer does not sound even when vehicle deviates from its lane.

Combination meter assembly

*1: One Time Recognition

*2: Sequential Recognition

READ NEXT:

 Terminals Of Ecu

TERMINALS OF ECU NOTICE: DTCs may be output when connectors are disconnected during inspection. Therefore, be sure to clear the DTCs using the Techstream once the inspection has been completed. D

 Diagnosis System

DIAGNOSIS SYSTEM FUNCTION OF INDICATOR AND WARNING MESSAGE (a) If the lane control system is not functioning properly, the driver is warned through the LTA indicator and a warning message is displayed

 Dtc Check / Clear

DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Chassis / Lane Control / Trouble Code

SEE MORE:

 Removal

REMOVAL PROCEDURE 1. REMOVE THROTTLE BODY WITH MOTOR ASSEMBLY Click here 2. REMOVE NO. 2 SURGE TANK STAY Click here 3. SEPARATE ENGINE WIRE (a) Remove the 2 bolts and separate the engine wire. (b) Remove the bolt and separate the earth wire. 4. DISCONNECT AIR TUBE

 Terminals Of Ecu

TERMINALS OF ECU CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) (a) Disconnect the P22 sliding roof ECU (sliding roof drive gear sub-assembly) connector. (b) Measure the resistance and voltage according to the value(s) in the table below. HINT: Measure the values on the wire harness

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