B1493

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1493/93: Max Hot Bypass Damper COOL Control Circuit
B1493/93 - Max Hot Bypass Damper COOL Control Circuit

DESCRIPTION

The max hot bypass damper servo motor (for COOL) 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 COOL) 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 COOL))

(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 Symptom Related Diagnostic Procedures
A -- Continue to next step.

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

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