Inspection Procedure

PREPARATION: 

Remove A/C amplifier with connectors still connected.

CHECK: 

1. Turn ignition switch to ON.
2. Measure voltage between terminals FRTR and FRSG of A/C amplifier connector at each temperature.

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 

Fig 1: Checking Voltage Between Terminals FRTR And FRSG Of A/C Amplifier

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

As the 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 11 is displayed, check and replace A/C amplifier. 

PREPARATION: 

Disconnect front room temperature sensor connector.

CHECK: 

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

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 

Fig 2: Identifying Front Room Temperature Sensor Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

As the temperature increases, the resistance decreases.

1. NG: Replace front room temperature sensor. 
2. OK: Go to Next Step. 

1. NG: Repair or replace harness or connector. 
2. OK: Check and replace A/C amplifier.