Blower Motor Circuit

HEATING / AIR CONDITIONING: SOLAR VENTILATION SYSTEM: Blower Motor Circuit
- Blower Motor Circuit

DESCRIPTION

The solar ventilation system and air conditioning system use the same blower motor for ventilation.

In order to be driven by each system, the blower motor switches between two different power sources using the solar ventilation relay. When the power switch is off, power from the solar ventilation system is supplied to the blower motor and when the power switch is in a mode other than off, power from the air conditioning system is supplied to the blower motor.

The blower motor controls its operation and speed using the power and signals supplied by the solar ventilation ECU when the power switch is off.

Changes its speed according to the amount of sunlight received by the moon roof glass assembly (solar panel).

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Check the operation by referring to the table below.

Air Conditioner





OK:

Blower motor operates and blower motor speed level changes.

NG -- GO TO AIR CONDITIONING SYSTEM (BLOWER MOTOR CIRCUIT) Blower Motor Circuit
OK -- Continue to next step.

2. INSPECT SOLAR VENTILATION RELAY

(a) Remove the solar ventilation relay.





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

Standard Resistance:





NG -- REPLACE SOLAR VENTILATION RELAY
OK -- Continue to next step.

3. INSPECT SOLAR VENTILATION ECU

(a) Disconnect the solar ventilation relay connector.





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

Standard Voltage:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (SOLAR VENTILATION ECU - SOLAR VENTILATION RELAY)
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (SOLAR VENTILATION ECU - BLOWER MOTOR)

(a) Disconnect the solar ventilation ECU connector.





(b) Disconnect the blower motor connector.





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

Standard Resistance:





Text in Illustration





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

5. INSPECT SOLAR VENTILATION ECU

(a) Reinstall the solar ventilation relay.

(b) Reconnect the solar ventilation relay connector.

(c) Reconnect the blower motor connector.

(d) Reconnect the solar ventilation ECU connector.

(e) Measure the waveform between terminal L22-5 (BLW) of the solar ventilation ECU and body ground.









OK:

Waveform is as shown in the illustration.

HINT
The waveform varies with the blower speed.

Text in Illustration





NG -- REPLACE BLOWER MOTOR

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Solar Ventilation System

6. REPLACE BLOWER MOTOR

(a) Replace the blower motor with a known good one and check if the same problem occurs again Removal.

OK:

Same problem does not occur.

NG -- REPLACE SOLAR VENTILATION ECU Removal

OK -- END (BLOWER MOTOR WAS DEFECTIVE)

7. CHECK HARNESS AND CONNECTOR (SOLAR VENTILATION ECU - SOLAR VENTILATION RELAY)

(a) Disconnect the solar ventilation ECU connector.





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





Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE SOLAR VENTILATION ECU Removal