Inspection Procedure
WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
For circuit wiring diagram, see Fig 1.
- Check the continuity of the ECU-B2 and ECU-IG fuses. See COMPONENT LOCATIONS table. If there is continuity, go to the next step. If there is not continuity, replace the failed fuse.
- Turn the ignition switch ON. Measure the voltage between terminals IG and GND. Turn the ignition switch OFF. Disconnect the body ECU No. 2 connector. Measure the voltage between terminals BECU and GND. If the voltage is between 10-14 volts, perform the next test procedure of the problem symptom. See BODY ECU NO. 2 PROBLEM SYMPTOM INDEX table. If the voltage is not as specified, go to the next step.
- Check for short to power, short to ground and continuity in the wiring harness and connector between the body ECU No. 2 and body ground. If the results are OK, check and repair the wiring harness and connector between the body ECU No. 2 and battery.