B1445

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1445/45: Passenger Side Cool Air Bypass Damper Control
B1445/45 - Passenger Side Cool Air Bypass Damper Control

DESCRIPTION

HINT
Although the tester title says "Passenger Side", there is only one cool air bypass servo motor on this vehicle.

The cool air bypass servo motor sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the cool air bypass servo motor to any position. As a result, when the air conditioner is operating, the temperature of the air blowing toward the passenger's head area is controlled.

HINT
Confirm that no mechanical problem is present because this diagnostic trouble code can be output when either a damper link or damper is mechanically locked.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (COOL AIR BYPASS SERVO MOTOR TARGET PULSE)

(a) Use the Data List to check if the servo motor is functioning properly.

Air Conditioner





OK:

The display is as specified in the normal condition.

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER Removal

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System (For Automatic Air Conditioning System)
A -- Continue to next step.

2. REPLACE COOL AIR BYPASS SERVO MOTOR (for Passenger Side)

(a) Temporarily replace the cool air bypass servo motor with a new one Disassembly.

HINT
Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new one and check that the condition returns to normal.

NEXT -- Continue to next step.

3. CHECK FOR DTC

(a) Clear the DTC DTC Check / Clear.

(b) Check for DTC DTC Check / Clear.

OK:

DTC is not output.

NG -- REPAIR OR REPLACE AIR CONDITIONING HARNESS

OK -- END (COOL AIR BYPASS SERVO MOTOR IS DEFECTIVE)

4. REPAIR OR REPLACE AIR CONDITIONING HARNESS

(a) Repair or replace the air conditioning harness.

NEXT -- Continue to next step.

5. CHECK FOR DTC

(a) Clear the DTC DTC Check / Clear.

(b) Check for DTC again DTC Check / Clear.

OK:

DTC is not output.

NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal

OK -- END