RX400h · Service Manual HEATER & AIR CONDITIONING SYSTEM

B1443/43

Diagnostic trouble codes

DESCRIPTION

This circuit turns the servomotor and changes each damper position by receiving the signals from the A/C amplifier assembly.
The air outlet damper servo switches the air outlet by rotating the motor (normal, reverse) with electrical power from the A/C amplifier assembly.
When the AUTO switch is on, the A/C amplifier assembly changes the mode between "FACE", "BI-LEVEL" and "FOOT" according to the temperature setting.
DTC No.
 DTC Detecting Condition
 Trouble Area
B1443/43
 Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operated air outlet damper control servomotor.
  1. Air outlet control servomotor
  2. Harness or connector between air outlet control servomotor and A/C amplifier assembly
  3. A/C amplifier assembly

WIRING DIAGRAM

I036322E09

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/O DAMP POS
 Air outlet damper position / min.: -14% max.: 113.5%
 Damper is at "FACE": 0%
Damper is at "FACE/FOOT": 33.5%*1,23.5%*2
Damper is at "FOOT" (Manual): 53.5%*1, 56.5%*2
Damper is at "FOOT" (Auto): 53.5%*1,56.5%*2
Damper is at "FACE/DEF": 73.5%*1, 76.5%*2
Damper is at "DEF": 100%
 Open in the circuit: 50.0%
A/O DAMP TARG
 Air outlet damper target position / min.: -14% max.: 113.5%
  1. *1: LHD
  2. *2: RHD

OK:
When the target position is at the "FACE" (0%), the actual opening angle is 19.0% or less.
When the target position is at the "DEF" (100%), 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. 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 air flow position by hand.

    ACTIVE TEST / AIR CONDITIONER 
    Item
    		 Test Details/Display
    (Range)
    		 Diagnostic Note
    A/O MODE DAMP-D
    		 Air outlet damper position (Driver side) /min.: -14% max.: 113.5%
    		 -

    OK:
    Air comes out from the selected air outlet.


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. Warm up the engine.

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

  1. Press the UPDr switch and change to step operation.

  1. Press the UPDr switch and check the air flow by hand.

Display Code
 Air flow condition
0
 FACE (0%)
1
 FACE (0%)
2
 FACE (0%)
3
 FACE (0%)
4
 B/L (33.5%)*1, (23.5%)*2
5
 FOOT (AUTO) (53.5%)*1, (56.5%)*2
6
 FOOT (MANUAL) (53.5%)*1, (56.5%)*2
7
 FOOT (MANUAL) (53.5%)*1, (56.5%)*2
8
 F/D (73.5%)*1, (76.5%)*2
9
 DEF (100%)
  1. *1: LHD
  2. *2: RHD

OK:
Air flow 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 OUTLET CONTROL SERVOMOTOR

  1. E110735E01
    Remove the air outlet control servomotor.

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

  1. LHD: 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 "DEF" position smoothly.RHD: 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 "DEF" position smoothly.

    OK:
    Lever turns to "DEF" position smoothly.

  1. LHD: Connect the positive (+) lead from the battery to terminal 5 and the negative (-) lead to terminal 4, then check that the lever turn to the "FACE" position smoothly.RHD: Connect the positive (+) lead from the battery to terminal 4 and the negative (-) lead to terminal 5, then check that the lever turn to the "FACE" position smoothly.

    OK:
    Lever turns to "FACE" position smoothly.



 NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
OK


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

  1. E109216E20
    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
    A10-5 (AOF) - A22-5 (FACE)*1
    		Always
    		 Below 1 Ω
    A10-5 (AOF) - A22-4 (FACE)*2
    		Always
    		 Below 1 Ω
    A10-6 (AOD) - A22-4 (DEF)*1
    		Always
    		 Below 1 Ω
    A10-6 (AOD) - A22-5 (DEF)*2
    		Always
    		 Below 1 Ω
    A10-5 (AOF) - Body ground
    		 Always
    		 10 kΩ or higher
    A10-6 (AOD) - 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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