NO.2 AMOUNT OF AIR BLOWN FROM FRONT VENTS DOES NOT CHANGE

2	Amount of air blown from front vents does not change.
DESCRIPTION	• Malfunction in front blower system • Amount of air blown front vents does not change when switching front climate control unit airflow control dial.
POSSIBLE CAUSE	• Front A/C unit malfunction • Front blower motor malfunction • Malfunction in front power MOS FET system • Front climate control unit malfunction

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, inspect to make sure connectors, terminals and wiring harness are connected correctly and undamaged.

STEP	INSPECTION	ACTION
1	INSPECT HEATER BLOWER 40 A FUSE • Is it normal?	Yes	Go to the next step.
No	Replace the fuse, then go to Step 15. If the fuse burns out immediately, go to the next step.
2	INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C UNIT OR ELSEWHERE • Turn the ignition switch to the ON position. • Turn the fan switch to ON position. • Recirculate air inside the vehicle. • Does the front blower motor operate normal speed?	Yes	Go to the next step.
No	Go to Step 4.
3	INSPECT FRONT A/C UNIT INTAKE VENT • Is front A/C unit intake vent clogged?	Yes	Remove obstruction, then go to Step 15.
No	Inspect if there are any obstruction in the A/C unit passage, then go to Step 15.
4*	INSPECT TO SEE WHETHER MALFUNCTION IS IN FRONT BLOWER RELAY SYSTEM OR FRONT POWER MOS FET SYSTEM • Turn the ignition switch to ON position. • Turn the fan switch to OFF position. • Measure the voltage at the following front blower motor terminal. ― Terminal B (blower motor operation signal) • Is voltage approx. 12 V?	Yes	Go to Step 8.
No	Go to the next step.
5*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCUIT BETWEEN FUSE BLOCK AND FRONT BLOWER RELAY) OR ELSEWHERE • Measure the voltage at the following front blower relay terminals. ― Terminal B (IG2 signal) ― Terminal E (B+ signal) • Is the voltage approx. 12 V?	Yes	Go to the next step.
No	Repair the wiring harness between the front blower relay and A/C 7.5A HEATER 50 A fuse, then go to Step 15.
6*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCUIT BETWEEN FRONT BLOWER RELAY AND GROUND) OR ELSEWHERE • Measure the voltage at the following front blower relay terminal. ― Terminal D (GND signal) • Is the voltage approx. 0 V?	Yes	Go to the next step.
No	Repair the wiring harness between the front blower relay and ground, then go to Step 15.
7*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN OR SHORT CIRCUIT BETWEEN FRONT BLOWER RELAY AND FRONT BLOWER MOTOR) OR BLOWER RELAY • Measure the voltage at the following front blower relay terminal. ― Terminal A (blower motor operation signal) • Is the voltage approx. 12 V?	Yes	Repair the wiring harness between the front blower relay and blower motor, then go to Step 15.
No	Replace the front blower relay, then go to Step 15.
8*	INSPECT TO SEE WHETHER MALFUNCTION IS IN BLOWER MOTOR OR ELSEWHERE • Measure the voltage at the following blower motor terminal. ― Terminal B (blower motor operation signal) • Is the voltage approx. 12 V?	Yes	Go to the next step.
No	Inspect the front blower motor, then go to Step 15.
9*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN OR SHORT CIRCUIT BETWEEN FRONT BLOWER MOTOR AND FRONT POWER MOS FET) OR ELSEWHERE • Measure the voltage at the following terminal of front power MOS FET. ― Terminal A (blower motor operation signal) • Is voltage approx. 12 V?	Yes	Go to the next step.
No	Repair the wiring harness between the front blower motor and front power MOS FET, then go to Step 15.
10*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN OR SHORT CIRCUIT BETWEEN FRONT POWER MOS FET AND GROUND) OR ELSEWHERE • Measure the voltage at the following front power MOS FET terminal. ― Terminal E (blower motor operation signal) • Is the voltage approx. 0 V?	Yes	Go to the next step.
No	Repair the wiring harness between the front power MOS FET and ground, then go to Step 15.
11	INSPECT FRONT A/C UNIT • Inspect the fan for following:. ― Is the fan free of interference with the A/C unit case? ― Is the fan free of foreign material and obstruction? • Is the fan normal?	Yes	Go to the next step.
No	Remove obstruction, repair or replace the fan and front A/C unit case, then go to Step 15.
12*	INSPECT TO SEE WHETHER MALFUNCTION IS IN FRONT POWER MOS FET OR ELSEWHERE • Disconnect front power MOS FET connector. • Turn the fun switch to 1st position from off. • Measure the voltage at the following front power MOS FET terminal. ― Terminal B (blower motor control signal) • Is voltage approx. 10 V?	Yes	Replace the front power MOS FET, then go to Step 15.
No	Go to the next step.
13*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCUIT BETWEEN FRONT POWER MOS FET AND FRONT CLIMATE CONTROL UNIT) OR ELSEWHERE • Turn the ignition switch to the LOCK position. • Disconnect front climate control unit connector. • Inspect for continuity at the following terminals between the front power MOS FET and front climate control unit. ― Terminal F—1R (blower motor control signal) ― Terminal B—1P (blower motor feedback signal) • Is there continuity?	Yes	Go to the next step.
No	Repair the wiring harness between the front power MOS FET and climate control unit, then go to Step 15.
14*	INSPECT TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR WIRING HARNESS (SHORT TO GROUND IN WIRING HARNESS BETWEEN FRONT POWER MOS FET AND FRONT CLIMATE CONTROL UNIT) • Inspect for continuity at the following terminal between the power MOS FET and ground. ― Terminal D (blower motor control signal)—ground • Is there continuity?	Yes	Repair the wiring harness between the front power MOS FET and ground, then go to the next step.
No	Replace the front climate control unit, then go to the next step.
15	VERIFY REPAIR • Is air discharged from vent?	Yes	Troubleshooting completed. Explain repairs to customer.
No	Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.

STEP

INSPECTION

ACTION

INSPECT HEATER BLOWER 40 A FUSE

• Is it normal?

Yes

Go to the next step.

Replace the fuse, then go to Step 15. If the fuse burns out immediately, go to the next step.

INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C UNIT OR ELSEWHERE

• Turn the ignition switch to the ON position.

• Turn the fan switch to ON position.

• Recirculate air inside the vehicle.

• Does the front blower motor operate normal speed?

Yes

Go to the next step.

Go to Step 4.

INSPECT FRONT A/C UNIT INTAKE VENT

• Is front A/C unit intake vent clogged?

Yes

Remove obstruction, then go to Step 15.

Inspect if there are any obstruction in the A/C unit passage, then go to Step 15.

INSPECT TO SEE WHETHER MALFUNCTION IS IN FRONT BLOWER RELAY SYSTEM OR FRONT POWER MOS FET SYSTEM

• Turn the ignition switch to ON position.

• Turn the fan switch to OFF position.

• Measure the voltage at the following front blower motor terminal.

― Terminal B (blower motor operation signal)

• Is voltage approx. 12 V?

Yes

Go to Step 8.

Go to the next step.

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCUIT BETWEEN FUSE BLOCK AND FRONT BLOWER RELAY) OR ELSEWHERE

• Measure the voltage at the following front blower relay terminals.

― Terminal B (IG2 signal)

― Terminal E (B+ signal)

• Is the voltage approx. 12 V?

Yes

Go to the next step.

Repair the wiring harness between the front blower relay and A/C 7.5A HEATER 50 A fuse, then go to Step 15.

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCUIT BETWEEN FRONT BLOWER RELAY AND GROUND) OR ELSEWHERE

• Measure the voltage at the following front blower relay terminal.

― Terminal D (GND signal)

• Is the voltage approx. 0 V?

Yes

Go to the next step.

Repair the wiring harness between the front blower relay and ground, then go to Step 15.

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN OR SHORT CIRCUIT BETWEEN FRONT BLOWER RELAY AND FRONT BLOWER MOTOR) OR BLOWER RELAY

• Measure the voltage at the following front blower relay terminal.

― Terminal A (blower motor operation signal)

• Is the voltage approx. 12 V?

Yes

Repair the wiring harness between the front blower relay and blower motor, then go to Step 15.

Replace the front blower relay, then go to Step 15.

INSPECT TO SEE WHETHER MALFUNCTION IS IN BLOWER MOTOR OR ELSEWHERE

• Measure the voltage at the following blower motor terminal.

― Terminal B (blower motor operation signal)

• Is the voltage approx. 12 V?

Yes

Go to the next step.

Inspect the front blower motor, then go to Step 15.

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN OR SHORT CIRCUIT BETWEEN FRONT BLOWER MOTOR AND FRONT POWER MOS FET) OR ELSEWHERE

• Measure the voltage at the following terminal of front power MOS FET.

― Terminal A (blower motor operation signal)

• Is voltage approx. 12 V?

Yes

Go to the next step.

Repair the wiring harness between the front blower motor and front power MOS FET, then go to Step 15.

10*

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN OR SHORT CIRCUIT BETWEEN FRONT POWER MOS FET AND GROUND) OR ELSEWHERE

• Measure the voltage at the following front power MOS FET terminal.

― Terminal E (blower motor operation signal)

• Is the voltage approx. 0 V?

Yes

Go to the next step.

Repair the wiring harness between the front power MOS FET and ground, then go to Step 15.

INSPECT FRONT A/C UNIT

• Inspect the fan for following:.

― Is the fan free of interference with the A/C unit case?

― Is the fan free of foreign material and obstruction?

• Is the fan normal?

Yes

Go to the next step.

Remove obstruction, repair or replace the fan and front A/C unit case, then go to Step 15.

12*

INSPECT TO SEE WHETHER MALFUNCTION IS IN FRONT POWER MOS FET OR ELSEWHERE

• Disconnect front power MOS FET connector.

• Turn the fun switch to 1st position from off.

• Measure the voltage at the following front power MOS FET terminal.

― Terminal B (blower motor control signal)

• Is voltage approx. 10 V?

Yes

Replace the front power MOS FET, then go to Step 15.

Go to the next step.

13*

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCUIT BETWEEN FRONT POWER MOS FET AND FRONT CLIMATE CONTROL UNIT) OR ELSEWHERE

• Turn the ignition switch to the LOCK position.

• Disconnect front climate control unit connector.

• Inspect for continuity at the following terminals between the front power MOS FET and front climate control unit.

― Terminal F—1R (blower motor control signal)

― Terminal B—1P (blower motor feedback signal)

• Is there continuity?

Yes

Go to the next step.

Repair the wiring harness between the front power MOS FET and climate control unit, then go to Step 15.

14*

INSPECT TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR WIRING HARNESS (SHORT TO GROUND IN WIRING HARNESS BETWEEN FRONT POWER MOS FET AND FRONT CLIMATE CONTROL UNIT)

• Inspect for continuity at the following terminal between the power MOS FET and ground.

― Terminal D (blower motor control signal)—ground

• Is there continuity?

Yes

Repair the wiring harness between the front power MOS FET and ground, then go to the next step.

Replace the front climate control unit, then go to the next step.

VERIFY REPAIR

• Is air discharged from vent?

Yes

Troubleshooting completed.

Explain repairs to customer.

Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.