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 (A/CI)

Remove A/C amplifier assy with connectors still connected.
Turn the ignition switch to the ON position.

Measure voltage according to the value(s) in TERMINAL CONDITION SPECIFICATION .

Standard:

TERMINAL CONDITION SPECIFICATION

Terminal No.	Condition	Specified Condition
E7-33 (A/CI) - Body ground	A/C switch ON	Below 1.0 V

Fig 1: Inspecting Heater Control Housing Sub-Assy (A/CI)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 COMPRESSOR ASSY

Disconnect compressor connector.

Measure the resistance according to the value(s) in TERMINAL CONDITION SPECIFICATION .

Standard:

TERMINAL CONDITION SPECIFICATION

Terminal No.	Condition	Specified Condition
A3-1 - A3-2	at 20°C (68°F)	165 to 205 Ω

Fig 2: Inspecting Cooler Compressor Assy

NG: REPLACE COOLER COMPRESSOR ASSY
OK: Go to next step.

CHECK HARNESS AND CONNECTOR (BETWEEN COOLER COMPRESSOR ASSY AND ECM)
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: Go to next step.
INSPECT ECM (LCKI)
1. Remove ECM with connector.
2. Turn ignition switch ON.
3. A/C switch ON.
4. Measure waveform between terminal LCKI of ECM and body ground.
  Standard: Pulse generation
HINT:
- The correct waveform is as shown in Fig 4 .
  
  Fig 3: Inspecting ECM (LCKI)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Measuring Waveform Between Terminal LCKI Of ECM & Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: CHECK AND REPLACE ECM
2. OK: Go to next step.
CHECK HARNESS AND CONNECTOR (BETWEEN ECM AND HEATER CONTROL HOUSING SUB-ASSY)
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: CHECK AND REPLACE HEATER CONTROL HOUSING SUB-ASSY