Trouble Shooting

NOTE: Prior to trouble shooting, ensure no problems exist in multiplex communications. If problems exist, repair multiplex control system before trouble shooting. See MULTIPLEX CONTROL SYSTEMS - LS430 article. Check circuits and components in listed order. If circuits or components are okay, return to trouble shooting and identify next circuit to be checked. Perform power tilt steering column system self-diagnostics before performing trouble shooting. See DIAGNOSTIC PROCEDURE under SELF-DIAGNOSTIC SYSTEM.

SYMPTOM DIAGNOSIS

Problem

Inspect

Manual, Auto Away/Return & Memory Functions Do Not Operate, Stop Part Way Or Do Not Stop

Tilt & Telescopic

⁽¹⁾ Multiplex Communication System; ⁽²⁾ ECU Power Source Circuit; ⁽³⁾ Key Unlock Warning Switch; ⁽⁴⁾ Body Control ECU; ⁽²⁾ Actuator Power Source Circuit; ⁽²⁾ Sensor Power Source Circuit; ⁽²⁾ Tilt Motor Circuit; ⁽²⁾ Telescopic Motor Circuit; ⁽⁵⁾ Tilt & Telescopic ECU

Tilt Only

⁽¹⁾ Multiplex Communication System; ⁽²⁾ Sensor Power Source Circuit; ⁽²⁾ Tilt Motor Circuit; ⁽⁵⁾ Tilt & Telescopic ECU

Telescopic Only

⁽¹⁾ Multiplex Communication System; ⁽²⁾ Sensor Power Source Circuit; ⁽²⁾ Telescopic Motor Circuit; ⁽⁵⁾ Tilt & Telescopic ECU

Only Tilt & Telescopic Manual Switch Function Does Not Operate

Tilt & Telescopic

⁽¹⁾ Multiplex Communication System; ⁽²⁾ Tilt & Telescopic Manual Switch Circuit; ⁽⁵⁾ Tilt & Telescopic ECU

Tilt Only

⁽¹⁾ Multiplex Communication System; ⁽²⁾ Tilt & Telescopic Manual Switch Circuit; ⁽⁵⁾ Tilt & Telescopic ECU

Telescopic Only

⁽¹⁾ Multiplex Communication System; ⁽²⁾ Tilt & Telescopic Manual Switch Circuit; ⁽⁵⁾ Tilt & Telescopic ECU

Only Auto Away/Return Function Does Not Operate

Away & Return

Check Status Of Auto Away Function Using LEXUS Scan Tool; ⁽¹⁾ Multiplex Communication System; ⁽³⁾ Ignition Switch; ⁽³⁾ Key Unlock Warning Switch; ⁽⁵⁾ Tilt & Telescopic ECU

Away Only

⁽¹⁾ Multiplex Communication System; ⁽³⁾ Key Unlock Warning Switch Circuit; ⁽³⁾ Ignition Switch; ⁽⁵⁾ Tilt & Telescopic ECU

Return Only

⁽¹⁾ Multiplex Communication System; ⁽³⁾ Key Unlock Warning Switch; ⁽³⁾ Ignition Switch; ⁽⁵⁾ Tilt & Telescopic ECU

⁽¹⁾	See MULTIPLEX CONTROL SYSTEMS - LS430 article.

⁽²⁾	Perform appropriate test under SYSTEM TESTS . If more than one test is listed, perform tests in order listed.

⁽³⁾	See STEERING COLUMN SWITCHES article.

⁽⁴⁾	See BODY CONTROL SYSTEMS - LS430 article.

⁽⁵⁾	Perform TILT & TELESCOPIC ECU PIN VOLTAGE TESTS under PIN VOLTAGE TESTS. Repair or replace components as necessary.