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 TPD 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. Change the set temperature to activate the front air mix damper control servomotor, and measure the voltage between terminals TPD and SG of integration control and panel connector each time when the set temperature is changed.
OK:

HINT:

As the set temperature increases, the voltage decreases.
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 31 is displayed, check and replace integration control and panel.

NOTE: As the front air mix damper control servomotor moves from cool side to warm side, the resistance decreases.

Fig 3: Locating Front Air Mix Damper Control Servomotor Assembly Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Front Air Mix Damper Control Servomotor Assembly Connector Voltage Specifications

Check Front Air Mix Damper Position Sensor
Preparation:

Remove AIR MIX SERVOMOTOR .

Check:

Measure resistance between terminals 3 and 4 of front air mix damper control servomotor assembly connector.

OK:

Resistance: 4.2 - 7.8 kΩ .

Check:

While operating front air mix damper control servomotor, following the procedure, measure resistance between terminals 3 and 4 of front air mix damper control servomotor assembly connector.

OK:

HINT:
1. NG: Replace front air mix damper control servomotor assembly.
2. OK: Go to next step.
Check Harness And Connector Between Integration Control And Panel And Front Air Mix Damper Control Servomotor Assembly .
1. NG: Repair or replace harness or connector.
2. OK: Check and replace integration control and panel.