With Monochrome Display
BLOWER MOTOR
Description
COMPONENT DESCRIPTION
Brush-less Motor
The blower motor utilizes a brush-less motor with a rotating magnet.
Quietness is improved over previous motors where the brush was the point of contact and the coil rotated.
Blower Motor Circuit
BLOWER MOTOR
Diagnosis Procedure
Regarding Wiring Diagram information, With Monochrome Display.
1.CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
1. Using CONSULT-III, perform "SELF-DIAGNOSIS RESULTS" of HVAC.
2. Check if any DTC No. is displayed in the self-diagnosis results.
NOTE:
If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. With Monochrome Display or With Monochrome Display.
Is any DTC No. displayed?
YES - Perform diagnosis for the applicable DTC. Testing and Inspection.
NO - GO TO 2.
2.CHECK WITH ACTIVE TEST OF CONSULT-III
1. Using CONSULT-III, perform "HVAC TEST""ACTIVE TEST" of HVAC to check each output device. With Monochrome Display.
NOTE:
Perform the ACTIVE TEST after starting the engine, because the A/C compressor is operating.
2. Check that the blower motor control signal changes according to each indicator signal.
NOTE: Perform the inspection of each output device after starting the engine because the A/C compressor is operating.
Does it operate normally?
YES - Inspection End.
NO - GO TO 3.
3.CHECK FUSE
Check 15A fuses (Nos. 21 and 22) located in fuse block (J/B).
NOTE:
Fuse Block - Junction Box (J/B) for fuse location.
Is the inspection result normal?
YES - GO TO 4.
NO - GO TO 8.
4.CHECK POWER SUPPLY FOR BLOWER MOTOR
1. Turn ignition switch OFF.
2. Disconnect blower motor connector.
3. Turn ignition switch ON.
4. Check voltage between blower motor harness connector M31 terminal 4 and ground.
4 - Ground : Battery voltage
Is the inspection result normal?
YES - GO TO 5.
NO - GO TO 10.
5.CHECK BLOWER MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between blower motor harness connector M31 terminal 1 and ground.
1 - Ground : Continuity should exist.
Is the inspection result normal?
YES - GO TO 6.
NO - Repair harness or connector.
6.CHECK BLOWER MOTOR CIRCUIT CONTINUITY
1. Disconnect A/C auto amp. connector.
2. Check continuity between blower motor harness connector M31 (A) terminal 3 and A/C auto amp. harness connector M37 (B) terminal 32.
3 - 32 : Continuity should exist.
Is the inspection result normal?
YES - GO TO 7.
NO - Repair harness or connector.
7.CHECK A/C AUTO AMP. OUTPUT SIGNAL
1. Reconnect blower motor connector and A/C auto amp. connector.
2. Turn ignition switch ON.
3. Set MODE switch to the VENT position.
4. Check the output waveform between blower motor harness connector M31 terminal 3 and ground using an oscilloscope, while varying the fan speed from 1 to 7.
Is the inspection result normal?
YES - Replace the blower motor. Blower Motor.
NO - Replace the A/C auto amp. With Monochrome Display.
8.REPLACE FUSES
1. Replace fuses.
2. Activate the blower motor.
Does the fuse blow?
YES - GO TO 9.
NO - Inspection End.
9.CHECK BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
1. Turn ignition switch OFF.
2. Disconnect blower motor harness connector.
3. Check continuity between blower motor harness connector M31 terminal 4 and ground.
4 - Ground : Continuity should not exist.
Is the inspection result normal?
YES - Replace blower motor. Blower Unit Blower Motor.
NO - Repair harness or connector.
10.CHECK POWER SUPPLY OF THE FRONT BLOWER MOTOR RELAY
1. Turn the ignition switch OFF.
2. Remove the front blower motor relay.
3. Turn the ignition switch ON.
4. Check the voltage between front blower motor relay harness connector J-4 terminals 1, 5 and ground.
1, 5 - Ground : Battery voltage
Is the inspection result normal?
YES - GO TO 11.
NO - Repair harness or connector.
11.CHECK FRONT BLOWER MOTOR RELAY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between front blower motor relay harness connector J-4 terminal 2 and ground.
2 - Ground : Continuity should exist.
Is the inspection result normal?
YES - GO TO 12.
NO - Repair harness or connector.
12.CHECK BLOWER MOTOR SUPPLY CIRCUIT FOR OPEN
1. Disconnect A/C auto amp. connector.
2. Check continuity between blower motor harness connector M31 (A) terminal 4 and front blower motor relay harness connector J-4 (B) terminal 3.
3 - 4 : Continuity should exist.
Is the inspection result normal?
YES - Replace front blower motor relay.
NO - Repair harness or connector.