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 TR And SG-5 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 TR and SG-5 of integration control and panel connector at each temperature.
OK:

Voltage:

at 25°C (77°F): 1.8 - 2.2 V .

at 40°C (104°F): 1.2 - 1.6 V .

Fig 1: Locating Integration Control And Panel TR & SG-5 Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Go to step 3 .
2. OK: Proceed to next circuit inspection shown on problem symptoms table. See PROBLEM SYMPTOMS TABLE . However, if DTC19 is displayed, check and replace integration control and panel.

NOTE: As the temperature increases, the voltage decreases.

Fig 2: Locating Temperature Sensor Connector Terminals 1 & 2

Check Rear Room Temperature Sensor
Preparation:

Disconnect rear room temperature sensor connector.

Check:

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

OK:

Resistance:

at 25°C (77°F): 1.65 - 1.75 kΩ .

at 50°C (122°F): 0.55 - 0.65 kΩ .
1. NG: Replace rear room temperature sensor.
2. OK: Go to next step.
Check Harness And Connector Between Integration Control And Panel And Rear Room Temperature Sensor .
1. NG: Repair or replace harness or connector.
2. OK: Check and replace integration control and panel.