Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

Check driver seat ECU.
CHECK:

Check that the operation of front vertical and rear vertical is normal.

HINT:

With this inspection, whether or not the driver seat ECU CPU functions normally can be diagnosed.
1. NG : Replace driver seat ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. YES : Go to next step.

Check wire harness.

PREPARATION:

Pull out the ECU connectors mentioned below.

DTC DETECTION ITEM

Wire harness side connector of ECU	Terminal
Driver seat ECU - Transponder key ECU	MPX1 (D28-11) - MPX1 (T9-4)

CHECK:

Check continuity of the wire harness between the connectors.

Fig 1: Checking Continuity Of Wire Harness Between Connectors

OK:

There is a continuity between the connectors.

HINT:

If there is OPEN in any wire harness, please repair it.

NG : Repair or replace wire harness.
OK : Replace driver seat ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).