AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE [FULL-AUTO AIR CONDITIONER]

Troubleshooting item	Amount of air blown from vents does not change
Description	• Blower motor does not operate even if airflow volume control switch is operated (no airflow from vent) • Blower motor operation does not change even if airflow volume control switch is operated (airflow volume from vent does not change)
Possible cause	• Dash-electrical supply unit detects DTC ― Detects DTC and activates fail-safe • F40 40A fuse • Blower relay malfunction • Blower unit malfunction ― Clogging ― Interference between blower motor fan and case • Blower motor malfunction • Dash-electrical supply unit malfunction • Body control module (BCM) malfunction • Malfunction in CAN line between the heat pump control unit and climate control unit • Malfunction in CAN line between the heat pump control unit and dash-electrical supply unit • Open circuit in blower motor signal circuit • Short to ground in blower motor signal circuit • Open circuit in blower motor ground circuit • Short to power supply in blower motor ground circuit • Open circuit in blower motor power supply circuit • Open circuit in body control module (BCM) signal circuit • Short to power supply in body control module (BCM) signal circuit • Open circuit in blower relay power supply circuit

• When performing an asterisked (*) troubleshooting inspection, first verify the damage and connection status of the connectors and terminals, then perform the inspection while shaking the wiring harness (cause of malfunction may be due to poor connection of connectors, terminals, or wiring harness). If there is a malfunction in the connectors or terminals, securely connect, repair, or perform replacement.

Step	Inspection	Action
1	VERIFY DASH-ELECTRICAL SUPPLY UNIT DTCs • Perform the DTC inspection for the dash-electrical supply unit using the M-MDS. (See DTC INSPECTION.) • Is a DTC displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting and perform the repair completion verification. (See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT].)
No	Go to the next step.
2	VERIFY BLOWER MOTOR OPERATION • Switch the main power ON (READY off or on). • Set the airflow volume control switch to ON. • Set the air intake mode to REC. • Does the blower motor in the blower unit rotate smoothly?	Yes	Go to the next step.
No	Go to Step 4.
3	INSPECT BLOWER UNIT FOR CLOGGING • Is there clogging in the vent of the blower unit?	Yes	Remove the obstruction, then go to the repair completion verification.
No	Verify that there is no obstruction in the air duct between the blower unit and A/C unit, there is no air filter clogging, and the evaporator is not frosted (frozen), then go to the repair completion verification.
4^*	VERIFY BLOWER MOTOR TERMINAL VOLTAGE • Switch the main power ON (READY off or on). • Set the airflow volume control dial to 6 or more. • Measure the voltage at the following terminals. ― Blower motor terminal C • Is the voltage B+?	Yes	Go to the next step.
No	Go to Step 10.
5	VERIFY F40 40A FUSE • Remove the F40 40A fuse. • Inspect the F40 40A fuse. • Is the fuse normal?	Yes	Install the F40 40A fuse, then go to the next step.
No	Replace the F40 40A fuse and perform the repair completion verification.
6^*	VERIFY BLOWER RELAY TERMINAL VOLTAGE • Measure the voltage at the following terminals. ― Blower relay terminal C ― Blower relay terminal D • Is the voltage B+?	Yes	Go to the next step.
No	Repair or replace the blower relay power supply circuit and perform the repair completion verification.
7^*	VERIFY BLOWER RELAY TERMINAL VOLTAGE • Measure the voltage at the following terminals. ― Blower relay terminal B • Is the voltage 0 V?	Yes	Go to the next step.
No	Go to Step 9.
8^*	VERIFY BODY CONTROL MODULE (BCM) TERMINAL VOLTAGE • Measure the voltage at the following terminals. ― Body control module (BCM) terminal 2O • Is the voltage 0 V?	Yes	Repair or replace the body control module (BCM) signal circuit and perform the repair completion verification.
No	Replace the body control module (BCM) and perform the repair completion verification. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
9^*	VERIFY BLOWER RELAY TERMINAL VOLTAGE • Measure the voltage at the following terminals. ― Blower relay terminal A • Is the voltage B+?	Yes	After replacing the blower relay, perform the repair completion verification.
No	Repair or replace the blower motor power supply circuit and perform the repair completion verification.
10	INSPECT BLOWER MOTOR • Inspect the applicable parts. (See BLOWER MOTOR INSPECTION.) • Is the blower motor normal?	Yes	Go to the next step.
No	After replacing the blower motor, perform the repair completion verification. (See BLOWER MOTOR REMOVAL/INSTALLATION.)
11	INSPECT BLOWER MOTOR SIGNAL CIRCUIT FOR OPEN CIRCUIT AND SHORT TO GROUND • Inspect the applicable circuit for an open circuit and short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning part and perform the repair completion verification.
12	INSPECT BLOWER MOTOR GROUND CIRCUIT FOR OPEN CIRCUIT AND SHORT TO POWER SUPPLY • Inspect the applicable circuit for an open circuit and short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
No	Repair or replace the malfunctioning part and perform the repair completion verification.
13	VERIFY IF THERE IS OBSTRUCTION IN BLOWER MOTOR FAN ROTATION • Inspect the blower motor fan in the blower unit. ― Is the fan free of interference with the blower unit case? ― Is the fan free of foreign matter and obstructions? • Is the blower motor fan normal?	Yes	Replace the dash-electrical supply unit and perform the repair completion verification.
No	Remove the obstruction or repair/replace the blower motor fan, blower unit case, and perform the repair completion verification. (See BLOWER UNIT REMOVAL/INSTALLATION.)
Repair completion verification	VERIFY THAT MALFUNCTION DOES NOT RECUR AFTER REPAIRS • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Troubleshooting completed. (Explain repair contents to customer.)
No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction is not resolved, replace the dash-electrical supply unit. (See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

Step

Inspection

Action

VERIFY DASH-ELECTRICAL SUPPLY UNIT DTCs

• Perform the DTC inspection for the dash-electrical supply unit using the M-MDS.

(See DTC INSPECTION.)

• Is a DTC displayed?

Yes

Repair the malfunctioning part according to the applicable DTC troubleshooting and perform the repair completion verification.

(See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT].)

Go to the next step.

VERIFY BLOWER MOTOR OPERATION

• Switch the main power ON (READY off or on).

• Set the airflow volume control switch to ON.

• Set the air intake mode to REC.

• Does the blower motor in the blower unit rotate smoothly?

Yes

Go to the next step.

Go to Step 4.

INSPECT BLOWER UNIT FOR CLOGGING

• Is there clogging in the vent of the blower unit?

Yes

Remove the obstruction, then go to the repair completion verification.

Verify that there is no obstruction in the air duct between the blower unit and A/C unit, there is no air filter clogging, and the evaporator is not frosted (frozen), then go to the repair completion verification.

4^*

VERIFY BLOWER MOTOR TERMINAL VOLTAGE

• Switch the main power ON (READY off or on).

• Set the airflow volume control dial to 6 or more.

• Measure the voltage at the following terminals.

― Blower motor terminal C

• Is the voltage B+?

Yes

Go to the next step.

Go to Step 10.

VERIFY F40 40A FUSE

• Remove the F40 40A fuse.

• Inspect the F40 40A fuse.

• Is the fuse normal?

Yes

Install the F40 40A fuse, then go to the next step.

Replace the F40 40A fuse and perform the repair completion verification.

6^*

VERIFY BLOWER RELAY TERMINAL VOLTAGE

• Measure the voltage at the following terminals.

― Blower relay terminal C

― Blower relay terminal D

• Is the voltage B+?

Yes

Go to the next step.

Repair or replace the blower relay power supply circuit and perform the repair completion verification.

7^*

VERIFY BLOWER RELAY TERMINAL VOLTAGE

• Measure the voltage at the following terminals.

― Blower relay terminal B

• Is the voltage 0 V?

Yes

Go to the next step.

Go to Step 9.

8^*

VERIFY BODY CONTROL MODULE (BCM) TERMINAL VOLTAGE

• Measure the voltage at the following terminals.

― Body control module (BCM) terminal 2O

• Is the voltage 0 V?

Yes

Repair or replace the body control module (BCM) signal circuit and perform the repair completion verification.

Replace the body control module (BCM) and perform the repair completion verification.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

9^*

VERIFY BLOWER RELAY TERMINAL VOLTAGE

• Measure the voltage at the following terminals.

― Blower relay terminal A

• Is the voltage B+?

Yes

After replacing the blower relay, perform the repair completion verification.

Repair or replace the blower motor power supply circuit and perform the repair completion verification.

INSPECT BLOWER MOTOR

• Inspect the applicable parts.

(See BLOWER MOTOR INSPECTION.)

• Is the blower motor normal?

Yes

Go to the next step.

After replacing the blower motor, perform the repair completion verification.

(See BLOWER MOTOR REMOVAL/INSTALLATION.)

INSPECT BLOWER MOTOR SIGNAL CIRCUIT FOR OPEN CIRCUIT AND SHORT TO GROUND

• Inspect the applicable circuit for an open circuit and short to ground.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning part and perform the repair completion verification.

INSPECT BLOWER MOTOR GROUND CIRCUIT FOR OPEN CIRCUIT AND SHORT TO POWER SUPPLY

• Inspect the applicable circuit for an open circuit and short to power supply.

(See CIRCUIT INSPECTION.)

• Is the circuit normal?

Yes

Go to the next step.

Repair or replace the malfunctioning part and perform the repair completion verification.

VERIFY IF THERE IS OBSTRUCTION IN BLOWER MOTOR FAN ROTATION

• Inspect the blower motor fan in the blower unit.

― Is the fan free of interference with the blower unit case?

― Is the fan free of foreign matter and obstructions?

• Is the blower motor fan normal?

Yes

Replace the dash-electrical supply unit and perform the repair completion verification.

Remove the obstruction or repair/replace the blower motor fan, blower unit case, and perform the repair completion verification.

(See BLOWER UNIT REMOVAL/INSTALLATION.)

Repair completion verification

VERIFY THAT MALFUNCTION DOES NOT RECUR AFTER REPAIRS

• Install/connect the part removed/disconnected during the troubleshooting procedure.

• Has the malfunction symptom been eliminated?

Yes

Troubleshooting completed. (Explain repair contents to customer.)

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, perform the diagnosis from Step 1.

• If the malfunction is not resolved, replace the dash-electrical supply unit.

(See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)