DTC B1445 Cool Air Bypass Damper Control

DESCRIPTION

The No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the air outlet damper to any position, which controls the air outlet changes.

HINT:

Confirm that no mechanical problem is present because this trouble code may be stored when either a damper link or damper is mechanically locked.

DTC Code	DTC Detection Condition	Trouble Area
B1445	The air outlet damper position does not change for 30 seconds or more when the air conditioning amplifier assembly operates the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo).	No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) Air conditioning harness assembly Air conditioning amplifier assembly

WIRING DIAGRAM

Dtc B1445 Cool Air Bypass Damper Control. HEATING / AIR CONDITIONING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (COOL AIR BYPASS PULSE)

Use the Data List to check if the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) is functioning properly ().

Air Conditioner
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Cool Air Bypass Pulse	No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) target pulse / Min.: 0, Max.: 255	Shut and DEF mode: 6 (pulse) Shut: 28 (pulse) Open: 57 (pulse)	-

OK:
The display is as specified in the normal condition column.

Result
Result	Proceed to
OK (When troubleshooting according to the DTC)	A
OK (When troubleshooting according to problem symptoms table)	B
NG	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE ()

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()

A

2.REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (COOLER BYPASS DAMPER SERVO)

Temporarily replace the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo).

for LHD: .

for RHD: .

HINT:

Since the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) with a new or normally functioning one.

Clear the DTCs ().

Check for DTCs ().

Result
Result	Proceed to
DTC B1445 is not output	A
DTC B1445 is output	B

Go to step 3

END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [COOLER BYPASS DAMPER SERVO] IS FAULTY)

3.REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Temporarily replace the air conditioning harness assembly with a new or normally functioning one.

for LHD: .

for RHD: .

Clear the DTCs ().

Check for DTCs ().

Result
Result	Proceed to
DTC B1445 is not output	A
DTC B1445 is output	B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()

END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)