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 (TR, SG-5)

Remove A/C amplifier 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
A13-24 (TR) - A13-22 (SG-5)	at 25°C (77°F)	1.8 to 2.2 V
A13-24 (TR) - A13-22 (SG-5)	at 40°C (104°F)	1.2 to 1.6 V

HINT:

As the temperature increases, the voltage decreases.

PROBLEM SYMPTOM

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

Fig 1: Inspecting Heater Control Housing Sub-Assy (TR, SG-5)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

INSPECT COOLER (ROOM TEMP. SENSOR) THERMISTOR

Remove cooler (room temperature sensor) thermistor.

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

Standard:

TERMINAL CONDITION SPECIFICATION

Terminal No.	Condition	Specified Condition
1-2	at 25°C (77°F)	1.65 to 1.75 kΩ
1-2	at 40°C (104°F)	0.8 to 1.0 kΩ

HINT:

As the temperature increases, the resistance decreases.

Fig 2: Inspecting Cooler (Room Temp. Sensor) Thermistor

NG: REPLACE COOLER (ROOM TEMP. SENSOR) THERMISTOR
OK: Go to next step.

CHECK HARNESS AND CONNECTOR (BETWEEN COOLER (ROOM TEMP. SENSOR) THERMISTOR AND HEATER CONTROL HOUSING SUB-ASSY)
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: CHECK AND REPLACE HEATER CONTROL HOUSING SUB-ASSY