Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM0000018NA004X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM: 32,42; Air Inlet Damper Position Sensor Circuit; 2007 MY LX470 [08/2006 -        ]

DTC

32

Air Inlet Damper Position Sensor Circuit

DTC

42

Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

This sensor detects the position of the air inlet damper and sends the appropriate signals to the A/C amplifier.

The position sensor is built into the air inlet servo motor.

DTC No.

Detection Item

Trouble Area

32

Short to ground or to power source circuit in air inlet damper position sensor circuit
  • Air inlet damper position sensor
  • Harness or connector between air inlet damper position sensor and A/C amplifier
  • A/C amplifier

42

Air inlet damper position sensor value does not change even if A/C amplifier operates air inlet damper control servo motor

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK AIR CONDITIONING AMPLIFIER

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

(b) Turn the ignition switch ON.

(c) Press the REC/FRS switch to change air inlet between fresh and recirculation air, and measure the voltage between terminals TPI (A48-14) and FRSG (A48-18) of the A/C amplifier when the air inlet servo motor operates.

Standard voltage:

FRS-REC Switch

Specified condition

REC

3.5 to 4.5 V

FRS

0.5 to 1.5 V

HINT:

  • As the air inlet servo motor is moved from REC side to FRS side, the voltage decreases.
  • However, if DTC 32 or 42 is displayed, check and replace the A/C amplifier.
OK

REPLACE AIR CONDITIONING AMPLIFIER

NG

2.

CHECK AIR INLET DAMPER POSITION SENSOR

(a) Remove the air inlet servo motor.

(b) Measure the resistance between terminals 1 (GND) and 3 (PT) of the air inlet damper control servo motor connector.

Standard resistance:

4.2 to 7.8 kΩ

(c) While operating the air inlet damper control servo motor, follow the procedure on page ( 2007 MY LX470 [08/2006 -        ]; AIR CONDITIONING: AIR CONDITIONING SYSTEM: 42; Air Inlet Damper Control Servo Motor Circuit ) and measure the resistance between terminals 1 (GND) and 3 (PT) of the air inlet servo motor connector.

Standard resistance:

Damper Position

Specified condition

REC side

3.1 to 5.8 kΩ

FRS side

0.8 to 1.6 kΩ

HINT:

As the air inlet servo motor moves from REC side to FRS side, the resistance decreases.
NG

REPLACE AIR INLET SERVO MOTOR

OK

3.

CHECK WIRE HARNESS (AIR INLET DAMPER POSITION SENSOR - AIR CONDITIONING AMPLIFIER)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE AIR CONDITIONING AMPLIFIER