AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE [CLIMATE CONTROL SYSTEM]

DESCRIPTION	• Malfunction in blower system
POSSIBLE CAUSE	• HEATER 40 A fuse malfunction • A/C unit malfunction • Open or short circuit in wiring harness between climate control unit and blower relay • Blower relay malfunction • Blower motor malfunction • Blower fan controller malfunction • Climate control unit malfunction

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

Step	Inspection		Action
1	INSPECT FUSE • Remove the HEATER 40 A fuse. • Is the fuse normal?	Yes	Go to the next step.
1		No	If the fuse is melted: Repair or replace wiring harness for short to ground and replace the fuse. If the fuse is deterioration: Replace the fuse. Then go to Step 16.
2	INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C UNIT OR ELSEWHERE • Switch the ignition ON (engine off or on). • Turn the fan dial clockwise. • Recirculate air inside the vehicle. • Does the blower motor rotate smoothly?	Yes	Go to the next step.
2		No	Go to Step 4.
3	INSPECT A/C UNIT INTAKE VENT • Is A/C unit intake vent restricted?	Yes	Remove obstruction, then go to Step 16.
3		No	Inspect if there are any obstruction in the A/C unit passage, then go to Step 16.
4*	INSPECT TO SEE WHETHER MALFUNCTION IS IN BLOWER RELAY SYSTEM OR BLOWER FAN CONTROLLER SYSTEM • Switch the ignition ON (engine off or on). • Turn the fan dial clockwise. • Measure the voltage at the following blower motor terminal. ― Terminal B (blower motor operation signal) • Is voltage approx. 12 V?	Yes	Go to Step 8.
4*		No	Go to the next step.
5*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN FUSE BLOCK AND BLOWER RELAY) OR ELSEWHERE • Measure the voltage at the following blower relay terminals. ― Terminal A (B+ signal) ― Terminal D (B+ signal) • Is the voltage approx. 12 V?	Yes	Go to the next step.
5*		No	Refer to the wiring diagram and verify whether or not there is a common connector between blower relay terminal and HEATER 40 A fuse. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness. Go to Step 16.
6*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER RELAY AND GROUND) OR ELSEWHERE • Switch the ignition ON (engine on or off). • Measure the voltage at the following blower relay terminal. ― Terminal B (ground) • Is the voltage approx. 0 V?	Yes	Go to the next step.
6*		No	Refer to the wiring diagram and verify whether or not there is a common connector between blower relay terminal and body control module (BCM) terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness. Go to Step 16.
7*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER RELAY AND BLOWER FAN CONTROLLER OR BLOWER MOTOR) OR BLOWER RELAY • Switch the ignition ON (engine off or on). • Measure the voltage at the following blower relay terminal. ― Terminal C (blower motor operation signal) • Is the voltage approx. 12 V?	Yes	Repair the wiring harness for lack of continuity between the blower relay and blower fan controller or blower motor, then go to Step 16.
7*		No	Replace the blower relay, then go to Step 16. (See RELAY LOCATION.)
8*	INSPECT BLOWER MOTOR • Inspect the blower motor. (See BLOWER MOTOR INSPECTION.) • Is the blower motor normal?	Yes	Go to the next step.
8*		No	Replace the blower motor, then go to Step 16. (See BLOWER MOTOR REMOVAL/INSTALLATION.)
9*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER MOTOR AND BLOWER FAN CONTROLLER) OR ELSEWHERE • Measure the voltage at the following terminal of blower fan controller. ― Terminal C (blower fan controller operation signal) • Is voltage approx. 12 V?	Yes	Go to the next step.
9*		No	Refer to the wiring diagram and verify whether or not there is a common connector between blower motor terminal and blower fan controller terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness. Go to Step 16.
10*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER MOTOR AND BLOWER FAN CONTROLLER) OR ELSEWHERE • Measure the voltage at the following terminal of blower fan controller. ― Terminal A (blower motor operation signal) • Is voltage approx. 12 V?	Yes	Go to the next step.
10*		No	Refer to the wiring diagram and verify whether or not there is a common connector between blower motor terminal and blower fan controller terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness. Go to Step 16.
11*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER FAN CONTROLLER AND GROUND) OR ELSEWHERE • Measure the voltage at the following blower fan controller terminal. ― Terminal F (ground) • Is the voltage approx. 0 V?	Yes	Go to the next step.
11*		No	Refer to the wiring diagram and verify whether or not there is a common connector between blower fan controller terminal and ground. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness. Go to Step 16.
12	INSPECT A/C UNIT • Inspect the fan in A/C unit. ― Is the fan free of interference with the A/C unit case? ― Is the fan free of foreign matter and obstructions? • Is the fan normal?	Yes	Go to the next step.
12		No	Remove obstruction, repair or replace the fan and A/C unit case, then go to Step 16.
13*	INSPECT BLOWER FAN CONTROLLER • Inspect the blower fan controller. (See BLOWER FAN CONTROLLER INSPECTION.) • Is the blower fan controller normal?	Yes	Go to the next step.
13*		No	Replace the blower fan controller, then go to Step 16. (See BLOWER FAN CONTROLLER REMOVAL/INSTALLATION.)
14*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER FAN CONTROLLER AND CLIMATE CONTROL UNIT) OR ELSEWHERE • Switch the ignition off. • Disconnect climate control unit connector. • Inspect for continuity at the following terminals between the blower fan controller and climate control unit. ― Terminal E—Q (blower motor speed control signal) • Is there continuity?	Yes	Go to the next step.
14*		No	Refer to the wiring diagram and verify whether or not there is a common connector between blower fan controller terminal and climate control unit terminal. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness. Go to Step 16.
15*	INSPECT TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR WIRING HARNESS (SHORT TO GROUND IN WIRING HARNESS BETWEEN BLOWER FAN CONTROLLER AND CLIMATE CONTROL UNIT) • Inspect for continuity at the following terminal between the blower fan controller and ground. ― Terminal F (blower motor control signal)—ground • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between blower fan controller terminal and ground. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to the next step.
15*		No	Replace the climate control unit, then go to the next step. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
16	VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR • Is air discharged from vent?	Yes	Troubleshooting completed. Explain repairs to customer.
16		No	Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.