B1447

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1447/47: Rear Air Mix Damper Control Servo Motor Circuit

DTC B1447/47 - Rear Air Mix Damper Control Servo Motor Circuit

DESCRIPTION

The air mix rear damper servo sends pulse signals to indicate the damper position to the air conditioning amplifier. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the rear air mix damper to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the blown air.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (AIR MIX TARG PULSE (R))
(a) Connect the Techstream to DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List / Air Mix Targ Pulse (R).
(e) According to the display on the Techstream, read the Data List.

Air Conditioner





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

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)




(a) Disconnect the P9 No. 2 air conditioning harness connector.
(b) Disconnect the H67 air conditioning amplifier connector.
(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(d) Reconnect the air conditioning amplifier connector.
(e) Reconnect the No. 2 air conditioning harness connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. REPLACE AIR MIX REAR DAMPER SERVO
(a) Replace the air mix rear damper servo motor Disassembly.
NEXT -- Continue to next step.

4. CHECK FOR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC is not output

NG -- REPAIR OR REPLACE NO. 2 AIR CONDITIONING HARNESS
OK -- END (AIR MIX REAR DAMPER SERVO IS DEFECTIVE)
5. REPAIR OR REPLACE NO. 2 AIR CONDITIONING HARNESS
(a) Repair or replace the No. 2 air conditioning harness Disassembly.
NEXT -- Continue to next step.

6. CHECK FOR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC is not output

NG -- REPLACE AIR CONDITIONING AMPLIFIER
OK -- END