Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM0000018NI004X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM: Blower Motor Circuit; 2007 MY LX470 [08/2006 -        ]

Blower Motor Circuit

DESCRIPTION

This is the power source for the blower motor.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK AIR CONDITIONING AMPLIFIER

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

(b) Turn the ignition switch ON.

(c) Operate the blower motor.

(d) Measure the voltage between terminal FRBLW (A47-23) of the A/C amplifier and body ground.

Standard voltage:

10 to 14 V
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE

NG

2.

CHECK BLOWER MOTOR

(a) Remove the blower motor.

(b) Connect the positive (+) lead from the battery to terminal 2 of the blower motor connector and the negative (-) lead to terminal 1, and check the blower motor.

OK:

Blower motor operates smoothly.
NG

REPLACE BLOWER MOTOR

OK

3.

CHECK BLOWER MOTOR CONTROLLER

(a) Remove the blower motor controller with the connectors still connected.

(b) Turn the ignition switch ON.

(c) Operate the blower motor (High blower speed).

OK:

Tester connection

Standard Condition

GND - Body ground

Continuity

+B - Body ground

Battery Positive Voltage

+M - Body ground

Battery Positive Voltage

M+ - M-

Battery Positive Voltage

SI - Body ground

1 to 3 V
NG

REPLACE BLOWER MOTOR CONTROLLER

OK

REPAIR OR REPLACE HARNESS AND CONNECTOR