Last Modified: 4-30-2014 6.6 C Doc ID: RM0000018N0001X
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM: 17; Rear Evaporator Temperature Sensor Circuit; 2006 MY LX470 [05/2005 -        ]

DTC

17

Rear Evaporator Temperature Sensor Circuit

DESCRIPTION

This sensor detects the rear evaporator temperature and sends the appropriate signals to the A/C amplifier.

DTC No.

Detection Item

Trouble Area

17

Open or short in rear evaporator temperature sensor circuit
  • Rear evaporator temperature sensor
  • Harness or connector between rear evaporator temperature sensor and rear A/C amplifier
  • Rear A/C amplifier

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK REAR AIR CONDITIONING AMPLIFIER

(a) Remove the rear A/C amplifier with the connectors still connected.

(b) Turn the ignition switch ON.

(c) Measure the voltage between terminals TEC (A33-7) and SG (A33-9) of the rear A/C amplifier connector at each temperature.

Standard voltage:

2.0 to 2.4 V at 0°C (32°F)

1.4 to 1.8 V at 15°C (59°F)

HINT:

  • As the temperature increases, the voltage decreases.
  • However, if DTC 17 is displayed, check and replace the A/C amplifier.
OK

REPLACE REAR AIR CONDITIONING AMPLIFIER

NG

2.

INSPECT REAR EVAPORATOR TEMPERATURE SENSOR

(a) Remove the rear evaporator temperature sensor.

(b) Measure the resistance between terminals 1 and 2 of the evaporator temperature sensor connector at each temperature.

Standard resistance:

4.5 to 5.2 kΩ at 0°C (32°F)

2.0 to 2.7 kΩ at 15°C (59°F)

HINT:

As the temperature increases, the resistance decreases.
NG

REPLACE REAR EVAPORATOR TEMPERATURE SENSOR

OK

3.

CHECK WIRE HARNESS (REAR AIR CONDITIONING AMPLIFIER - REAR EVAPORATOR TEMPERATURE SENSOR)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE REAR AIR CONDITIONING AMPLIFIER