AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE [MANUAL AIR CONDITIONER]

DESCRIPTION	• Malfunction in blower system
POSSIBLE CAUSE	• HEATER 40 A fuse malfunction • Blower unit malfunction • Open or short circuit in wiring harness between fan switch and blower relay • Blower relay malfunction • Blower motor malfunction • Resistor malfunction • Fan switch 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 GND 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 BLOWER 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 BLOWER UNIT INTAKE VENT • Is blower unit intake vent clogged?	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 RESISTOR SYSTEM • Switch the ignition ON (engine off or on). • Turn the fan dial clockwise. • Measure the voltage at the following blower motor terminal. ― Terminal A (blower motor operation signal) • Is voltage approx. 12 V?	Yes	Go to Step 10.
4*		No	Go to the next step.
5*	INSPECT TO SEE WHETHER MALFUNCTION IS IN BLOWER MOTOR • 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 the next step.
5*		No	Go to Step 7.
6*	INSPECT BLOWER MOTOR • Inspect the blower motor. (See BLOWER MOTOR INSPECTION.) • Is the blower motor normal?	Yes	Go to Step 16.
6*		No	Replace the blower motor, then go to Step 16. (See BLOWER MOTOR REMOVAL/INSTALLATION.)
7*	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.
7*		No	If there is a common connector:If there is no common connector: Refer to the wiring diagram and verify whether or not there is a common connector between blower relay terminal and HEATER 40 A fuse. • 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. • Repair or replace the wiring harness. Go to Step 16.
8*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER RELAY AND GROUND) OR ELSEWHERE • Switch the ignition ON (engine off or on). • Measure the voltage at the following blower relay terminal. ― Terminal B (GND signal) • Is the voltage approx. 0 V?	Yes	Go to the next step.
8*		No	If there is a common connector:If there is no common connector: 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. • 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. • Repair or replace the wiring harness. Go to Step 16.
9*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER RELAY AND RESISTOR) 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 resistor, then go to Step 16.
9*		No	Replace the blower relay, then go to Step 16.
10*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER MOTOR AND RESISTOR) OR ELSEWHERE • Switch the ignition ON (engine off or on). • Measure the voltage at the following terminal of resistor. ― Terminal A (blower motor operation signal) • Is voltage approx. 12 V?	Yes	Go to the next step.
10*		No	If there is a common connector:If there is no common connector: Refer to the wiring diagram and verify whether or not there is a common connector between blower motor terminal and resistor terminal. • 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. • Repair or replace the wiring harness. Go to Step 16.
11*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN FAN SWITCH AND GROUND) OR ELSEWHERE • Disconnect the negative battery cable. • Inspect for continuity at the following terminals between the fan switch and ground. ― Terminal A (blower motor operation signal)—ground • Is there continuity?	Yes	Go to the next step.
11*		No	If there is a common connector:If there is no common connector: Refer to the wiring diagram and verify whether or not there is a common connector between resistor terminal and ground. • 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. • Repair or replace the wiring harness. Go to Step 16.
12	INSPECT BLOWER UNIT • Inspect the fan in blower unit. ― Is the fan free of interference with the blower unit case? ― Is the fan free of foreign material and obstruction? • Is the fan normal?	Yes	Go to the next step.
12		No	Remove obstruction, repair or replace the fan and blower unit case, then go to Step 16.
13*	INSPECT RESISTOR • Inspect the resistor. (See RESISTOR INSPECTION.) • Is the resistor normal?	Yes	Go to the next step.
13*		No	Replace the resistor, then go to Step 16. (See RESISTOR REMOVAL/INSTALLATION.)
14*	INSPECT FAN SWITCH • Inspect the fan switch. (See FAN SWITCH INSPECTION [MANUAL AIR CONDITIONER].) • Is the fan switch normal?	Yes	Go to the next step.
14*		No	Replace the fan switch, then go to Step 16. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
15*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN RESISTOR AND FAN SWITCH) OR ELSEWHERE • Switch the ignition off. • Disconnect fan switch connector. • Inspect for continuity at the following terminals between the resistor and fan switch. ― Terminal C—C (blower motor speed control signal) ― Terminal B—E (blower motor speed control signal) ― Terminal D—F (blower motor speed control signal) ― Terminal A—D (blower motor speed control signal) • Is there continuity?	Yes	Go to the next step.
15*		No	If there is a common connector:If there is no common connector: Refer to the wiring diagram and verify whether or not there is a common connector between resistor terminal and fan switch terminal. • 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. • Repair or replace the wiring harness. Go to the next step.
16	CONFIRM 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.