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 (IG1)
1. Remove the IG1 fuse from the driver side J/B.
2. Check that continuity exists in the IG1 fuse.
  
  Fig 1: Checking Fuse (IG1)
  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.
2. Turn the ignition switch to ON.
3. Measure voltage between terminal IG+ of the A/C amplifier and body ground.
  
  Fig 2: Disconnecting "A16" Connector From A/C Amplifier
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Voltage: 10-14 V
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.
  
  Fig 3: Measuring Resistance Between Terminal GND Of A/C Amplifier And Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Resistance: Below 1.0 Ω (Continuity)
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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