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 wire harness.

PREPARATION:

Pull out the ECU connectors mentioned below.

DTC DETECTION ITEM

Wire harness side connector of ECU	Terminal
Front light ECU - Gateway ECU	MPX1 (32)-MPL2(G3-17)
Front light ECU - Driver side J/B ECU	MPX2(31)-MPX1 (D3-15)

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 front light ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).