Inspection Procedure

WARNING: This page is about a different car, the 2006 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.
  Standard: Continuity exists.
  
  Fig 1: Identifying ECU-B Fuse
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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
  
  Fig 2: Disconnecting A16 Connector From A/C Amplifier Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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