Circuit Inspection

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

DTC 11: FRONT ROOM TEMPERATURE SENSOR CIRCUIT CIRCUIT DESCRIPTION

This sensor detects the temperature inside the cabin and sends the appropriate signals to the integration control and panel.

DTC No

Detection Item

Trouble Area

11

Open or short in front room temperature sensor circuit.

► Front room temp, sensor

• Harness or connector between front room temp sensor and integration control and panel

• Integration control and panel

Fig. 25: DTC Table

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. WIRING DIAGRAM

Fig. 26: Wiring Diagram - Front Room Temperature Sensor Circuit Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

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

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia PREPARATION:

Remove integration control and panel with connectors still connected. CHECK:

a. Turn ignition switch to ON.

b. Measure voltage between terminals TR and SG-3 of integration control and panel connector at each temperature.

Fig. 27: Measuring Voltage Between Terminal TR & SG-3 Of Integration Control And Panel Connector

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: Voltage:

at25°C(77°F): 1.8-2.2 V at40°C(104°F): 1.2- 1.6 V

HINT:

As the temperature increases, the voltage decreases. NG: Go to step 2.

OK: Proceed to next circuit inspection shown on problem symptoms table (See page DM 087). However, if DTC 11 is displayed, check and replace integration control and panel.

2. 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.

Resistance:

at 25°C (77°F): 1.65 - 1.75 kohm at 50°C (122°F): 0.55 - 0.65 kohm

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Fig. 28: Measuring Resistance Between Terminal Of Room Temperature Sensor Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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