Inspection Procedure

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

Check Voltage Between Terminals TEC And SG Of Integration Control And Panel Connector
Preparation:

Remove integration control and panel with connectors still connected.

Check:
1. Turn ignition switch to ON.
2. Measure voltage between terminals TEC and SG of integration control and panel connector at each temperature.
OK:

Voltage:

at 0°C (32°F): 2.0 - 2.4 V .

at 15°C (59°F): 1.4 - 1.8 V .

Fig 1: Locating Integration Control And Panel TEC & SG Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Go to step 2.
2. OK: Proceed to next circuit inspection shown on problem symptoms table. See PROBLEM SYMPTOMS TABLE . However, if DTC 17 is displayed, check and replace integration control and panel.

NOTE: As the temperature increases, the voltage decreases.

Fig 2: Testing Temperature Sensor Connector

Check Rear Evaporator Temperature Sensor
Preparation:

Remove REAR A/C EVAPORATOR .

Check:

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

OK:

Resistance:

at 0°C (32°F): 4.5 - 5.2 kΩ .

at 15°C (59°F): 2.0 - 2.7 kΩ .
1. NG: Replace rear evaporator temperature sensor.
2. OK: Go to next step.
Check Harness And Connector Between Integration Control And Panel And Rear Evaporator Temperature Sensor
1. NG: Repair or replace harness or connector.
2. OK: Check and replace integration control and panel.