Inspection Procedure

WARNING: This page is about a different car, the 2003 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

Check voltage between terminals TR and SG-3 of integration control and panel.
PREPARATION:

Remove integration control and panel with connectors still connected.

CHECK:
1. Turn ignition switch to ON.
2. Measure voltage between terminals TR and SG-3 of integration control and panel connector at each temperature.
  
  Fig 1: Measuring Voltage Between Terminals TR And SG-3 Of Integration Control And Panel Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK:
1. Voltage:
2. at 25°C (77°F) : 1.8 - 2.2 V
3. at 40°C (104°F) : 1.2 - 1.6 V
NOTE: As the temperature increases, the voltage decreases.
1. NG : Go to step 2.
2. OK : Proceed to next circuit inspection shown in PROBLEM SYMPTOMS TABLE . However, if DTC 11 is displayed, check and replace integration control and panel.
Check front room temperature sensor.
PREPARATION:

Disconnect room temperature sensor connector.

CHECK:

Measure resistance between terminals 1 and 2 of room temperature sensor connector at each temperature.

Fig 2: Identifying Room Temperature Sensor Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:
1. Resistance:
2. at 25°C (77°F) : 1.65 - 1.75 kΩ
3. at 50°C (122°F) : 0.55 - 0.65 kΩ
NOTE: As the temperature increases, the resistance decreases.
1. NG : Replace front room temperature sensor.
2. OK : Go To Next Step.
Check harness and connector between front room temperature sensor and integration control and panel (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace harness or connector.
2. OK : Check and replace integration control and panel.