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 (IG1)
1. Remove the IG1 fuse from the driver side J/B.
2. Check that continuity exists in the IG1 fuse.
  Standard: Continuity exists.
  
  Fig 1: Identifying IG1 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.
2. Turn the ignition switch to ON.
3. Measure voltage between terminal IG+ of the A/C amplifier and body ground.
  Voltage: 10 - 14 V
  
  Fig 2: Disconnecting A16 Connector From A/C Amplifier
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
CHECK HARNESS AND CONNECTOR (BETWEEN AIR CONDITIONING AMPLIFIER AND BODY GROUND)
1. Disconnect the "A16" connector from the A/C amplifier assy.
2. Measure resistance between terminal GND of the A/C amplifier and body ground.
  Resistance: Below 1.0 Ω (Continuity)
  
  Fig 3: 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