Rear Blower Motor Circuit

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: Rear Blower Motor Circuit
- Rear Blower Motor Circuit

DESCRIPTION

The rear blower motor is operated by signals from the air conditioning amplifier. Rear blower motor speed signals are transmitted in accordance with changes in the duty ratio.

Duty Ratio:





The duty ratio is the ratio of the blower motor OFF time (B) to the total of the blower motor ON and OFF time (A + B).

The blower motor controller controls the blower motor speed.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (REAR BLOWER MOTOR)

(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 / Active Test / Rear Blower Motor

(e) According to the display on the Techstream, check rear blower motor operation while performing the Active Test.

Air Conditioner





Result





C -- CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR CONTROL - AIR CONDITIONING AMPLIFIER)

B -- INSPECT FUSE (RR HTR)

A -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table

2. INSPECT FUSE (RR HTR)

(a) Remove the RR HTR fuse from the engine room relay block.





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

Standard Resistance:





(c) Reinstall the RR HTR fuse.

NG -- REPLACE FUSE
OK -- Continue to next step.

3. INSPECT REAR BLOWER MOTOR (SYSTEM VOLTAGE)

(a) Disconnect the P10 rear blower motor connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





(c) Reconnect the rear blower motor connector.

NG -- CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR - REAR BLOWER MOTOR CONTROL, BODY GROUND)
OK -- Continue to next step.

4. INSPECT REAR BLOWER MOTOR

(a) Remove rear blower motor Removal.





(b) Check the rear blower motor.

OK:





(c) Reinstall the rear blower motor.

NG -- REPLACE REAR BLOWER MOTOR Removal
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR - REAR BLOWER MOTOR CONTROL, BODY GROUND)

(a) Disconnect the P10 rear blower motor connector.





(b) Disconnect the P11 rear blower motor control connector.

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

Standard Resistance:





(d) Reconnect the rear blower motor control connector.

(e) Reconnect the rear blower motor connector.

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

6. CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR CONTROL - FUSE, BODY GROUND)

(a) Disconnect the P11 rear blower motor control connector.





(b) Measure the resistance and voltage according the value(s) in the table below.

Standard Resistance:





Standard Voltage:





(c) Reconnect the rear blower motor control connector.

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

7. CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR CONTROL - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the P11 rear blower motor control connector.





(b) Disconnect the H67 air conditioning amplifier connector.

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

Standard Resistance:





(d) Reconnect the air conditioning amplifier connector.

(e) Reconnect the rear blower motor control connector.

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

8. INSPECT REAR BLOWER MOTOR CONTROL

(a) Disconnect the H67 air conditioning amplifier connector.





(b) Measure the voltage according the value(s) in the table below.

Standard Voltage:





(c) Reconnect the air conditioning amplifier connector.

NG -- REPLACE BLOWER MOTOR CONTROL Removal
OK -- Continue to next step.

9. INSPECT AIR CONDITIONING AMPLIFIER

(a) Remove the air conditioning amplifier with its connectors still connected Removal.





(b) Check the waveform of the air conditioning amplifier connector.





NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal

OK -- REPLACE REAR BLOWER MOTOR Removal