AIR CONDITIONING SYSTEM, Diagnostic DTC:B1442/42

DESCRIPTION

The No. 1 blower damper servo sub-assembly (air inlet) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal, reverse) based on the signals to move the air inlet mode selection No. 1 blower damper servo sub-assembly (air inlet) to any position, which controls the intake air settings (FRESH, FRESH/RECIRCULATION, and RECIRCULATION).

The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the intelligent tester on.

   4. Operate the R/F (Recirculation/Fresh) switch.

   5. Enter the following menus: Body / Air Conditioner / Data List.

   6. Check the value(s) by referring to the table below.

      Air Conditioner

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Air Inlet Damper Actual Pulse	No. 1 blower damper servo sub-assembly (air inlet) actual pulse / Min.: 0, Max.: 255	RECIRCULATION: 7 (pulse) FRESH: 28 (pulse)	-

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

      Result
      Result Proceed to NG A OK (When troubleshooting according to Problem Symptoms Table) B OK (When troubleshooting according to the DTC (for TMC, TMMR Made)) C OK (When troubleshooting according to the DTC (for TMMK Made)) D

   
   

   B

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   C

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

   D

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

   A

2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the intelligent tester on.

   4. Enter the following menus: Body / Air Conditioner / Active Test.

   5. Check the operation by referring to the table below.

      Air Conditioner

      Tester Display	Test Part	Control Range	Diagnostic Note
      Air Inlet Damper Targ Pulse	No. 1 blower damper servo sub-assembly (air inlet) pulse	Min.: 0, Max.: 255	Operates between 7 and 28 pulses

      OK
      Recirculation damper position changes in accordance with each control range.

      Result
      Result Proceed to OK (for TMC, TMMR Made) A OK (for TMMK Made) B NG C

   
   

   B

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

   C

   REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (AIR INLET) Click here

   A

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

3. REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (AIR INLET)

   
   

   1. Replace the No. 1 blower damper servo sub-assembly (air inlet) Click here (for TMC, TMMR Made)) Click here (for TMMK Made)).

      Tech Tips

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

   2. Check for the DTC.

      Result
      Result Proceed to DTC B1442/42 is output A DTC B1442/42 is not output B

   
   

   B

   END (NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (AIR INLET) WAS DEFECTIVE)

   A

4. REPLACE AIR CONDITIONING HARNESS ASSEMBLY

   
   

   1. Replace the air conditioning harness assembly Click here (for TMC, TMMR Made)) Click here (for TMMK Made)).

      Tech Tips

      Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or known good one and check that the condition returns to normal.

   2. Check for the DTC.

      Result
      Result Proceed to DTC B1442/42 is output (for TMC, TMMR Made) A DTC B1442/42 is output (for TMMK Made) B DTC B1442/42 is not output C

   
   

   B

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

   C

   END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

   A

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here