Inspection Procedure

1. Remove the rear A/C amplifier with the connectors still connected.
2. Turn the ignition switch ON.
3. Measure the voltage between terminals TR (A35-7) and SGND (A35-12) of the rear A/C amplifier connector at each temperature.

   Standard voltage: 

   1.8 to 2.2 V at 25°C (77°F) 

   1.2 to 1.6 V at 40°C (104°F) 

   HINT:

   • As the temperature increases, the voltage decreases.
   • However, if DTC 19 is displayed, check and replace the A/C amplifier.

OK: REPLACE REAR AIR CONDITIONING AMPLIFIER 

Fig 1: Measuring Voltage Between Terminals TR (A35-7) And SGND (A35-12) Of Rear A/C Amplifier Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to next step 

1. Disconnect the R33 rear room temperature sensor connector.
2. Measure the resistance between terminals 1 and 2 of the room temperature sensor connector at each temperature.

   Standard resistance: 

   1.65 to 1.75 kΩ at 25°C (77°F) 

   0.55 to 0.65 kΩ at 50°C (122°F) 

   HINT:

   • As the temperature increases, the voltage decreases.
   • However, if DTC 19 is displayed, check and replace the A/C amplifier.

NG: REPLACE REAR ROOM TEMPERATURE SENSOR 

Fig 2: Identifying R33 Rear Room Temperature Sensor Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE REAR AIR CONDITIONING AMPLIFIER