Recirculation Damper Servo Motor Circuit

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air Conditioning System): Recirculation Damper Servo Motor Circuit

Recirculation Damper Servo Motor Circuit

DESCRIPTION

The recirculation damper servo motor and No. 1 heater control (air inlet control switch) are powered through the HTR-IG fuse. Operating No. 1 heater control (air inlet control switch) drives the recirculation damper servo motor to switch between "FRESH" and "RECIRCULATION".

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (HTR-IG)
(a) Remove the HTR-IG fuse from the instrument panel junction block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE FUSE (HTR-IG)
OK -- Continue to next step.

2. INSPECT RECIRCULATION DAMPER SERVO MOTOR
(a) Remove the recirculation damper servo motor.




(b) Disconnect the connector from the recirculation damper servo motor.
(c) Connect a positive (+) lead from the battery to terminal 5 and a negative (-) lead from the battery to terminal 2, then check that the arm turns to the "FRESH" side smoothly.
OK:
Lever turns to "FRESH" side smoothly.
(d) Connect a positive (+) lead from the battery to terminal 5 and a negative (-) lead from the battery to terminal 1, then check that the arm turns to the "RECIRCULATION" side smoothly.
OK:
Lever turns to "RECIRCULATION" side smoothly.
NG -- REPLACE RECIRCULATION DAMPER SERVO MOTOR
OK -- Continue to next step.

3. INSPECT NO. 1 HEATER CONTROL (AIR INLET CONTROL SWITCH)
(a) Remove the No. 1 heater control (air inlet control switch).




(b) Disconnect the connector from the No. 1 heater control (air inlet control switch).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





(d) Check that the indicator light comes on.
(1) Turn the heater control base (air inlet control switch) to LOCK.
(2) Connect a positive (+) lead from the battery to terminal 2 and a negative (-) lead from the battery to terminal 4, and check that the indicator light comes on.
OK:
The indicator light comes on.
(e) Check that the illumination comes on.
(1) Connect a positive (+) lead from the battery to terminal 7 and negative (-) lead from the battery to terminal 6, and check that the illumination comes on.
OK:
The illumination comes on.
NG -- REPLACE NO. 1 HEATER CONTROL (AIR INLET CONTROL SWITCH)
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (RECIRCULATION DAMPER SERVO MOTOR - BATTERY)




(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:






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

5. CHECK HARNESS AND CONNECTOR (NO. 1 HEATER CONTROL (AIR INLET CONTROL SWITCH) - BATTERY)




(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:






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

6. CHECK HARNESS AND CONNECTOR (NO. 1 HEATER CONTROL(AIR INLET CONTROL SWITCH) - BODY GROUND)




(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






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

7. CHECK HARNESS AND CONNECTOR (NO. 1 HEATER CONTROL - RECIRCULATION DAMPER SERVO MOTOR)




(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






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

8. CHECK HARNESS AND CONNECTOR (NO. 1 HEATER CONTROL - A/C AMPLIFIER)




(a) Disconnect the connector from the A/C amplifier.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE