DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER (AIR MIX SERVO TARG PULSE [D])
REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX DAMPER SERVO)
REPLACE AIR CONDITIONING HARNESS ASSEMBLY
DTC B1446 Air Mix Damper Control Servo Motor Circuit (Driver Side)
DESCRIPTION
The No. 1 air conditioning radiator damper servo sub-assembly (air mix 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 mix damper to any position. As a result, the air mix damper varies the mixture of hot air from the heater core and cold air from the evaporator so that the temperature of the air is as requested.
- 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 |
| B1446 |
The air mix 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 (air mix damper servo). |
No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo)
Air conditioning harness assembly
Air conditioning amplifier assembly
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WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE USING INTELLIGENT TESTER (AIR MIX SERVO TARG PULSE [D]) |
Use the Data List to check if the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) is functioning properly ().
Air Conditioner| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Air Mix Servo Targ Pulse (D) |
No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) target pulse / Min.: 0, Max.: 255 |
for LHD MAX. COOL: 90 (pulse)
MAX. HOT: 8 (pulse)
for RHD MAX. COOL: 8 (pulse)
MAX. HOT: 90 (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 ()
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| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
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| 2.REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX DAMPER SERVO) |
Temporarily replace the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo).
- Since the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) with a new or normally functioning one.
Check for DTCs ().
Result| Result | Proceed to |
| DTC B1446 is not output | A |
| DTC B1446 is output | B |
| A | |
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| END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [AIR MIX DAMPER SERVO] IS FAULTY) |
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| 3.REPLACE AIR CONDITIONING HARNESS ASSEMBLY |
Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one.
Check for DTCs ().
Result| Result | Proceed to |
| DTC B1446 is not output | A |
| DTC B1446 is output | B |
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
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| A | |
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| END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY) |
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