Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

Check IGN and ECU-B2 fuse.
CHECK:

Check continuity of IGN and ECU-B2 fuse.

OK:
1. Continuity
1. NG: Replace the failure fuse.
2. OK: Go to Next Step.
Check voltage between terminals IG, CPUB and GND of transponder key ECU connector. (See PROCEDURE ).
PREPARATION:

Turn the ignition switch ON.

CHECK:

Measure voltage between terminals IG and GND.

OK:
1. Voltage: 10 - 14 V
PREPARATION:
1. Turn the ignition switch OFF.
2. Disconnect the transponder key ECU connector.
CHECK:

Measure voltage between terminals CPUB and GND.

OK:
1. Voltage: 10 - 14 V
1. OK: Proceed to next circuit inspection shown in problem symptoms table (See PROBLEM SYMPTOMS TABLE ).
2. NG: Go to Next Step.
Check wire harness and connector between transponder key ECU and body ground or fuse (See PROCEDURE ).
1. NG: Repair or replace wire harness or connector.
2. OK: Proceed to next circuit inspection shown on problem symptom table (See PROBLEM SYMPTOMS TABLE ).