Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE(ECU-B FUSE)
1. Remove the ECU-B fuse from the driver side J/B.
2. Check that the continuity exists of ECU-B fuse.
NG: REPLACE FUSE

OK: Go to next step.
CHECK HARNESS AND CONNECTOR(BETWEEN HEATER CONTROL HOUSING SUB-ASSY AND BATTERY)
1. Remove the A/C amplifier with connectors still connected.
2. Measure voltage between terminals +B and GND of A/C amplifier.
  
  Fig 1: Measuring Voltage Between Terminals +B And GND Of A/C Amplifier
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Voltage: 10 to 14 V
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (SEE PROBLEM SYMPTOMS TABLE )