Inspection Procedure

WARNING: This page is about a different car, the 2002 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT A1RCONDITIONER AMPLIFIER ASSEMBLY
1. Remove A/C amplifier with connectors still connected.
2. Turn ignition switch ON.
3. Measure voltage between terminals A9-12 (HAZ) and A10-14 (GND) of A/C amplifier connector.
  Voltage:
  
  ON:10-14V
  
  OFF: Below 1V
  
  Fig 1: Measuring Voltage Between Terminals A9-12 (HAZ) And A10-14 (GND)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE AIR CONDITIONER AMPLIFIER ASSEMBLY
2. OK: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR
1. Check for open and short circuit in harness and connector between terminal HAZ of driver side J/B ECU and hazard switch.
2. Check for open and short circuit in harness and connector between hazard switch and body ground.
1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOM TABLE, SEE PROBLEM SYMPTOMS TABLE .