Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE (ECU-B)
1. Remove the ECU-B fuse from the engine room R/B.
2. Check that the continuity exists of ECU-B fuse.
  
  Fig 1: Checking Fuse (ECU-B)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard: Continuity exists.
NG: REPLACE FUSE

OK: Go To Next Step.
CHECK HARNESS AND CONNECTOR (BETWEEN AIR CONDITIONING AMPLIFIER AND BATTERY)
1. Disconnect the "A16" connector from the A/C amplifier assy.
2. Measure voltage between terminal +B of the A/C amplifier assy and body ground.
  Voltage: 10-14 V
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE , refer to PROBLEM SYMPTOMS TABLE