Inspection Procedure

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

INSPECT HEATER CONTROL HOUSING SUB-ASSY (PSW)

Install the manifold gauge set.
Remove A/C amplifier assy with connectors still connected.
Turn the ignition switch to the ON position.
Check voltage between terminal PSW of A/C amplifier connector and body ground when refrigerant pressure is changed.
The voltage changes with refrigerant pressure as shown in Fig 1 .
Voltage:

Fig 1: Inspecting Heater Control Housing Sub-Assy (PSW)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Identifying Voltage Changes With Refrigerant Pressure
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

PROBLEM SYMPTOM

A	NG
B	OK (when checking from the PROBLEM SYMPTOM TABLE)
C	OK (Checking from the DTC)

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE
C: CHECK AND REPLACE HEATER CONTROL HOUSING SUB-ASSY
A: Go to next step.

INSPECT COOLER CONDENSER ASSY (PRESSURE SW)
1. Turn ignition switch ON.
2. Check continuity between terminals 1 and 4 of pressure switch when refrigerant pressure is changed.
3. The continuity changes with refrigerant pressure as shown in Fig 3 .
  Continuity:
  
  Fig 3: Inspecting Cooler Condenser Assy (Pressure SW)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Identifying Continuity Changes With Refrigerant Pressure
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE COOLER CONDENSER ASSY
2. OK: Go to next step.
CHECK HARNESS AND CONNECTOR (BETWEEN PRESSURE SW AND HEATER CONTROL HOUSING SUB-ASSY)
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: CHECK AND REPLACE HEATER CONTROL HOUSING SUB-ASSY