Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM0000018NC004X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM: 42; Air Inlet Damper Control Servo Motor Circuit; 2007 MY LX470 [08/2006 -        ]

DTC

42

Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The air inlet damper control servo motor is controlled by the A/C amplifier and moves the air inlet damper to the desired position.

DTC No.

Detection Item

Trouble Area

42

Air inlet damper position sensor value does not change even if A/C amplifier operated air inlet damper control servo motor
  • Air inlet damper control servo motor
  • Harness or connector between air inlet damper control servo motor and A/C amplifier
  • A/C amplifier

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

PERFORM ACTUATOR CHECK

(a) Warm up the engine.

(b) Set the actuator check mode 2007 MY LX470 [08/2006 -        ]; AIR CONDITIONING: AIR CONDITIONING SYSTEM: ACTUATOR CHECK .

(c) Press the DEF switch and change it to step operation.

(d) Press the DEF switch and check the operation of the air inlet damper and the condition of the blower.

OK:

Display Code

Air Inlet Damper

0 to 1

FRESH

2

R/F (50%)

3

RECIRC

4 to 7

FRESH
OK

REPLACE AIR CONDITIONING AMPLIFIER

NG

2.

CHECK AIR INLET DAMPER CONTROL SERVO MOTOR

(a) Remove the air inlet servo motor.

(b) Connect positive (+) lead to terminal 5 (MREC) and negative (-) lead to terminal 4 (MFRS), and check the air inlet damper control servo motor.

OK:

The lever moves smoothly to REC position.

(c) Connect positive (+) lead to terminal 4 (MFRS) and negative (-) lead to terminal 5 (MREC), and check the air inlet damper control servo motor.

OK:

The lever moves smoothly to FRS position.
NG

REPLACE AIR INLET SERVO MOTOR

OK

3.

CHECK WIRE HARNESS (AIR INLET DAMPER CONTROL SERVO MOTOR - AIR CONDITIONING AMPLIFIER)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE AIR CONDITIONING AMPLIFIER