RX400h · Service Manual HEATER & AIR CONDITIONING SYSTEM

B1442/42

Diagnostic trouble codes

DESCRIPTION

The air inlet control servomotor is controlled by the A/C amplifier assembly and moves the air inlet control servomotor to the desired position.
The air inlet control servomotor switches between "RECIRCULATION" and "FRESH" by rotating the motor (normal, reverse) with electrical power from the A/C amplifier assembly. This controls intake air and switches "RECIRCULATION", "FRESH" and "HALF-RECIRCULATION".
DTC No.
 DTC Detecting Condition
 Trouble Area
B1442/42
 Air inlet damper position sensor value does not change even if air conditioning amplifier assembly operates air outlet damper control servomotor.
  1. Air inlet control servomotor
  2. Harness or connector between air inlet control servomotor and A/C amplifier assembly
  3. A/C amplifier assembly

WIRING DIAGRAM

I036322E08

INSPECTION PROCEDURE


1. READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and push the intelligent tester main switch on.

  1. Select the item below in the DATA LIST, and read the display on the intelligent tester.

DATA LIST / AIR CONDITIONER 
Item
 Measurement Item/Display
(Range)
 Normal Condition
 Diagnostic Note
A/I DAMP POS
 Air inlet damper position / min.: -14% max.: 113.5%
 Damper is at "RECIRCULATION": -9%
Damper is at "HALF-RECIRCULATION": 35 to 75%
Damper is at "FRESH": 109%
 Open in the circuit: 50.0%
A/I DAMP TARG
 Air inlet damper target position / min.: -14% max.: 113.5%

OK:
When the target position is at the "RECIRCULATION" (-9%), the actual opening angle is 19.0% or less.
When the target position is at the "FRESH" (109%), the actual opening angle is 81.0% or more.


Result:
Result
 Proceed to
NG
 A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
 B
OK (Checking from the DTC)
 C



B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
A


2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER

  1. Remove the glove box and check the recirculation damper operation.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and push the intelligent tester main switch on.

  1. Select the item below in the ACTIVE TEST and then check that the damper operates.

    ACTIVE TEST / AIR CONDITIONER 
    Item
    		 Test Details/Display
    (Range)
    		 Diagnostic Note
    A/I DAMP-LINEAR
    		 Air inlet damper position (linear) /min.: -14% max.: 113.5%
    		 -

    OK:
    Lever turns from "RECIRCULATION" side to "FRESH" side smoothly.
    Lever turns from "FRESH" side to "RECIRCULATION" side smoothly.


Result:
Result
 Proceed to
NG
 A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
 B
OK (Checking from the DTC)
 C



B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
A


3. PERFORM ACTUATOR CHECK

  1. Remove the glove box and check the recirculation damper operation.

  1. Set the actuator check mode (Click here).

  1. Press the UPDr switch in order and check the operation of recirculation damper.

Display Code
 Recirculation damper position
0
 FRESH (109%)
1
 FRESH (109%)
2
 R/F (50%)
3
 RECIRCULATION (-9%)
4
 FRESH (109%)
5
 FRESH (109%)
6
 FRESH (109%)
7
 FRESH (109%)
8
 FRESH (109%)
9
 FRESH (109%)

OK:
Recirculation damper position changes in accordance with each display code.


Result:
Result
 Proceed to
NG
 A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
 B
OK (Checking from the DTC)
 C



B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
A


4. INSPECT AIR INLET CONTROL SERVOMOTOR

  1. E110734E01
    Remove the air inlet control servomotor.

  1. Disconnect the connector from the air inlet control servomotor.

  1. Connect the positive (+) lead from the battery to terminal 5 and the negative (-) lead to terminal 4, then check that the lever turns to the "FRESH" position smoothly.

    OK:
    Lever turns to "FRESH" position smoothly.

  1. Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 5, then check that the lever turns to the "RECIRCULATION" position smoothly.

    OK:
    Lever turns to "RECIRCULATION" position smoothly.



 NG
REPLACE AIR INLET CONTROL SERVOMOTOR
OK


5. CHECK HARNESS AND CONNECTOR (AIR INLET CONTROL SERVOMOTOR - A/C AMPLIFIER ASSEMBLY)

  1. E109216E19
    Disconnect the connector from the A/C amplifier assembly.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    (Symbols)
    		 Condition
    		 Specified condition
    A10-3 (AIR) - A19-4 (MREC)*1
    		Always
    		 Below 1 Ω
    A10-3 (AIR) - A19-5 (MREC)*2
    		Always
    		 Below 1 Ω
    A10-4 (AIF) - A19-5 (MFRS)*1
    		Always
    		 Below 1 Ω
    A10-4 (AIF) - A19-4 (MFRS)*2
    		Always
    		 Below 1 Ω
    A10-3 (AIR) - Body ground
    		 Always
    		 10 kΩ or higher
    A10-4 (AIF) - Body ground
    		 Always
    		 10 kΩ or higher

    1. (*1): LHD
    2. (*2): RHD



 NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY


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