1.SELF-DIAGNOSIS RESULT CHECK With CONSULT-III

1. Perform the “SELF-DIAGNOSIS”.
2. Check if any DTC is detected in the self-diagnostic results.

NOTE：
If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to DTC Logic or DTC Logic.
Is any DTC displayed?
YES>>Perform the diagnosis that is applicable to the sensor and door motor. Refer to DTC Index.
NO>>GO TO 2.
2.PERFORM ACTIVE TEST
With CONSULT-III

1. Perform the “HVAC TEST” of HVAC active test item.
2. Check that the blower motor control signal changes according to each indicator number.

   | Test item
   MODE 1 | MODE 2 | MODE 3 | MODE 4 | MODE 5 | MODE 6 | MODE 7
   Mode door position | VENT | B/L 1 | B/L 2 | FOOT | D/F | DEF | —
   Intake door position | REC | REC | 20% FRE | FRE | FRE | FRE | —
   Air mix door position (driver & passenger side) | FULL COOL | FULL COOL | FULL HOT | FULL HOT | FULL HOT | FULL HOT | —
   Blower fan motor control signal duty ratio | 37% | 91% | 65% | 65% | 65% | 91% | —
   Magnet clutch | ON | ON | OFF | OFF | ON | ON | —
   ECV | 100% | 100% | 0% | 0% | 50% | 100% | —

   NOTE：
   - Perform the inspection of each output device after starting the engine because the compressor is operated.
   - If the Mode 7 is selected, the malfunction is displayed but it is normal.

Does it operate normally?
YES>>INSPECTION END
NO>>GO TO 3.
3.CHECK THE BLOWER MOTOR POWER SUPPLY CIRCUIT

1. Turn the ignition switch OFF.
2. Disconnect the blower motor connector.
3. Turn the ignition switch ON.
4. Check voltage between the blower motor harness connector and ground.

   (+) | (−) | Voltage
   Blower motor | —
   Connector | Terminal
   M109 | 1 | Ground | Battery voltage

Is the inspection result normal?
YES>>GO TO 4.
NO>>GO TO 7.
4.CHECK THE BLOWER MOTOR GROUND CIRCUIT

1. Turn the ignition switch OFF.
2. Check for continuity between the blower motor harness connector and ground.

   Blower motor | — | Continuity
   Connector | Terminal
   M109 | 3 | Ground | Existed

Is the inspection result normal?
YES>>GO TO 5.
NO>>Repair the harnesses or connectors.
5.CHECK THE BLOWER MOTOR CIRCUIT CONTINUITY

1. Disconnect the A/C auto amp. connector.
2. Check for continuity between the blower motor harness connector and A/C auto amp. harness connector.

   Blower motor | A/C auto amp. | Continuity
   Connector | Terminal | Connector | Terminal
   M109 | 2 | M66 | 32 | Existed

Is the inspection result normal?
YES>>GO TO 6.
NO>>Repair the harnesses or connectors.
6.CHECK A/C AUTO AMP. OUTPUT SIGNAL

1. Connect the blower motor connector.
2. Connect the A/C auto amp. connector.
3. Turn the ignition switch ON.
4. Set the mode switch to VENT.
5. Change fan speed from Lo to Hi, and check duty ratios between blower motor harness connector and ground by using an oscilloscope.
   NOTE：
   Calculate the drive signal duty ratio as shown in the figure.
   T2 = Approx. 1.6 ms

   Blower motor | Condition | Duty ratio (Approx.)
   Connector | Terminal | Fan speed (manual) VENT mode
   M109 | 2 | 1st | 25 %
   2nd | 33 %
   3rd | 41 %
   4th | 51 %
   5th | 61 %
   6th | 71 %
   7th | 77 %

Is the inspection result normal?
YES>>Replace the blower motor.
NO>>Replace the A/C auto amp.
7.CHECK POWER VOLTAGE OF BLOWER RELAY

1. Turn the ignition switch OFF.
2. Remove the blower relay. Refer to Fuse, Connector and Terminal Arrangement.
3. Turn the ignition switch ON.
4. Check the voltage between blower relay fuse block side terminal and ground. Refer to Description for relay terminal assignment.

   (+) | (−) | Voltage
   Blower relay | —
   1 | Ground | Battery voltage
   3

Is the inspection result normal?
YES>>GO TO 8.
NO>>Check ignition power supply circuit. Refer to Wiring Diagram - BATTERY POWER SUPPLY -.
8.CHECK BLOWER RELAY

1. Turn the ignition switch OFF.
2. Install the blower relay. Refer to Fuse, Connector and Terminal Arrangement.
3. Turn the ignition switch ON.
4. Check the operating sound of blower relay.

Is the inspection result normal?
YES>>GO TO 9.
NO>>Replace the blower relay.
9.CHECK FUSE
Check 15A fuses [Nos. 21 and 22, located in the fuse block (J/B)].
NOTE：
Refer to Fuse, Connector and Terminal Arrangement.
Is the inspection result normal?
YES>>Repair the harnesses or connectors.
NO>>Replace the fuse after repairing the applicable circuit.