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 MPX-B3 and LUG J/B fuse.
CHECK:

Check continuity of MPX-B3 and LUG J/B fuse.

OK:

Continuity
1. NG : Replace the failure fuse.
2. OK : Go to next step.
Check voltage between terminals MPX-B, HIC and GND of luggage room J/B ECU connector.
PREPARATION:

Disconnect the luggage room J/B ECU connector.

CHECK:

Measure voltage between terminals MPX-B, HIC and GND.

OK:

Voltage: 10 - 14 V
1. OK : Proceed to next circuit inspection shown on problem symptom table (See PROBLEM SYMPTOMS TABLE ).
2. NG : Go to next step.
Check wire harness and connector between luggage room J/B ECU and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace wire harness or connector.
2. OK : Check and repair wire harness and connector between luggage room J/B ECU and battery (See PROBLEM SYMPTOMS TABLE ).