B1459

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1459/59: Max Hot Bypass Damper HOT Control Circuit
B1459/59 - Max Hot Bypass Damper HOT Control Circuit

DESCRIPTION

The max hot bypass damper servo motor (for HOT) 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 max hot bypass damper servo motor (for HOT) to any position. As a result, when the air conditioner is operating, the temperature of the air blowing toward the driver's head area is controlled.

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (MAX HOT BYPASS DAMPER SERVO MOTOR TARGET PULSE (for HOT))

(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





B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

C -- REPLACE AIR CONDITIONING AMPLIFIER Removal
A -- Continue to next step.

2. REPLACE MAX HOT BYPASS SERVO MOTOR (for HOT)

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

OK:

Same problem does not occur.

NG -- REPLACE AIR CONDITIONING HARNESS Disassembly

OK -- END