AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE [FULL-AUTO 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 blower fan controller and HEATER 40 A fuse

• Open or short circuit in wiring harness between front body control module (FBCM) and blower relay

• Open or short circuit in wiring harness between blower fan controller and climate control unit

• Open or short circuit in wiring harness between blower fan controller and blower motor

• Open circuit in wiring harness between blower fan controller and body ground

• 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 • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Remove the HEATER 40 A fuse. • Is the fuse normal?	Yes	Go to the next step.
1		No	If the fuse is blown: • Refer to the wiring diagram and verify whether or not there is a common connector between HEATER 40 A fuse and blower fan controller terminal / front body control module (FBCM) 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 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. • Replace the fuse. If the fuse is damaged: • Replace the fuse. Then go to Step 18.
2	INSPECT TO SEE WHETHER MALFUNCTION IS IN BLOWER UNIT OR ELSEWHERE • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Switch the ignition ON (engine off or on). • Turn the airflow volume control switch on. • Recirculate air inside the vehicle. • Does the blower motor rotate?	Yes	Go to the next step.
2		No	Go to Step 4.
3	INSPECT BLOWER UNIT INTAKE VENT • Is blower unit intake vent restricted?	Yes	Remove obstruction, then go to Step 18.
3		No	Inspect if there are any obstruction in the A/C unit passage, then go to Step 18.
4*	INSPECT TO SEE WHETHER MALFUNCTION IS IN BLOWER RELAY SYSTEM OR ELSEWHERE • Turn the airflow volume control switch on. • Measure the voltage at the following terminal (wiring harness side). ― Blower fan controller terminal F (blower motor operation signal) • Is voltage B+?	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 terminals (wiring harness side). ― Blower relay terminal A (B+ signal) ― Blower relay terminal B (B+ signal) • Is the voltage B+?	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 18.
6*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER RELAY AND GROUND) OR ELSEWHERE • Measure the voltage at the following terminal (wiring harness side). ― Blower relay terminal D (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 front body control module (FBCM) 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 18.
7*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER RELAY AND BLOWER FAN CONTROLLER) OR BLOWER RELAY • Measure the voltage at the following terminal (wiring harness side). ― Blower relay terminal C (blower motor operation signal) • Is the voltage B+?	Yes	Repair the wiring harness for lack of continuity between the blower relay and blower fan controller, then go to Step 18.
7*		No	Replace the blower relay, then go to Step 18. (See RELAY LOCATION.)
8	INSPECT TO SEE WHETHER MALFUNCTION IS IN BLOWER MOTOR OR ELSEWHERE • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • 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 18. (See BLOWER MOTOR REMOVAL/INSTALLATION.)
9*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER FAN CONTROLLER AND CLIMATE CONTROL UNIT) OR ELSEWHERE • Disconnect the blower fan controller connector. (See BLOWER FAN CONTROLLER REMOVAL/INSTALLATION.) • Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) • Inspect for continuity between the following terminals (wiring harness-side). With dual type climate control unit: ― Bower fan controller terminal B—climate control unit terminal 1E With single type climate control unit: ― Bower fan controller terminal B—climate control unit terminal Q • Is there continuity?	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 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 18.
10*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO GROUND BETWEEN BLOWER FAN CONTROLLER AND CLIMATE CONTROL UNIT) OR ELSEWHERE • Inspect for continuity between the following terminal (wiring harness-side) and body ground. ― Blower fan controller terminal B • 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 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 18.
10*		No	Go to the next step.
11*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO POWER SUPPLY BETWEEN BLOWER FAN CONTROLLER AND CLIMATE CONTROL UNIT) OR ELSEWHERE • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Switch the ignition on (engine off or on). • Measure the voltage at the following terminal (wiring harness side). ― Blower fan controller terminal B • 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 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 18.
12*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO POWER SUPPLY BETWEEN BLOWER FAN CONTROLLER AND BODY GROUND) OR ELSEWHERE • Measure the voltage at the following terminal (wiring harness side). ― Blower fan controller terminal C • Is the voltage approx. 0 V?	Yes	Go to the next step.
12*		No	Refer to the wiring diagram and verify whether or not there is a common connector between blower fan controller terminal and body 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 18.
13*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER FAN CONTROLLER AND BODY GROUND) OR ELSEWHERE • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Inspect for continuity between the following terminal (wiring harness-side) and body ground. ― Blower fan controller terminal C • Is there continuity?	Yes	Go to the next step.
13*		No	Refer to the wiring diagram and verify whether or not there is a common connector between blower fan controller terminal and body 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 18.
14*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN BLOWER FAN CONTROLLER AND BLOWER MOTOR) OR ELSEWHERE • Inspect for continuity between the following terminals (wiring harness-side). ― Bower fan controller terminal E—blower motor terminal B ― Bower fan controller terminal A—blower motor terminal A • 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 blower motor. 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 18.
15*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO GROUND BETWEEN BLOWER FAN CONTROLLER AND BLOWER MOTOR) OR ELSEWHERE • Inspect for continuity between the following terminal (wiring harness-side) and body ground. ― Bower fan controller terminal E • 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 blower motor 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 18.
15*		No	Go to the next step.
16*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO POWER SUPPLY BETWEEN BLOWER FAN CONTROLLER AND BLOWER MOTOR) OR ELSEWHERE • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Switch the ignition on (engine off or on). • Measure the voltage at the following terminal (wiring harness side). ― Bower fan controller terminal E ― Bower fan controller terminal A • Is the voltage approx. 0 V?	Yes	Go to the next step.
16*		No	Refer to the wiring diagram and verify whether or not there is a common connector between blower fan controller terminal and blower motor. 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 18.
17	INSPECT BLOWER UNIT • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) • Inspect the fan in blower unit. (See BLOWER UNIT DISASSEMBLY/ASSEMBLY.) ― Is the fan free of interference with the blower unit case? ― Is the fan free of foreign matter and obstructions? • Is the fan normal?	Yes	Replace the blower fan controller, then go to the next step. (See BLOWER FAN CONTROLLER REMOVAL/INSTALLATION.)
17		No	Remove obstruction, repair or replace the fan and blower unit case, then go to the next step.
18	VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR • Is air discharged from vent?	Yes	Troubleshooting completed. Explain repairs to customer.
18		No	Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs. • If the malfunction recurs, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)