HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 J
Service Category: Vehicle Interior	Section: Heating/Air Conditioning
Model Year: 2008	Model: LX570	Doc ID: RM000003CPN003X
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DESCRIPTION (2008 LX570)

Cooling Box Blower Motor Circuit

DESCRIPTION

The cooler blower motor is operated by signals from the air conditioning amplifier assembly (for cool box).

1.	INSPECT FUSE (A/C IG)

(a) Remove the A/C IG fuse from the cowl side junction block LH.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A/C IG fuse	Always	Below 1 Ω

2.	CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS - BATTERY)

(a) Disconnect the No. 1 cooler wiring harness sub-assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
1 (B) - Body ground	Engine switch off	Below 1 V
1 (B) - Body ground	Engine switch on (IG)	11 to 14 V

3.	CHECK HARNESS AND CONNECTOR (NO. 1 COOLER WIRING HARNESS - BODY GROUND)

(a) Disconnect the No. 1 cooler wiring harness sub-assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
6 (L) - Body ground	Always	Below 1 Ω

4.	CHECK NO. 1 COOLER WIRING HARNESS SUB-ASSEMBLY (OPERATION)

(a) Replace the No. 1 cooler wiring harness sub-assembly with a normal one and check that the condition returns to normal.

OK:

Same problem does not occur.

5.	INSPECT COOLER BLOWER MOTOR

(a) Remove the cooler blower motor .

(b) Connect the positive (+) lead from the battery to terminal 2 and negative (-) lead to terminal 1, then check that the motor operates smoothly.

OK:

Cooler blower motor operates smoothly.