INSPECTION PROCEDURE 3: The blower does not work: Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line
CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
1. Connect scan tool (M.U.T.-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
1. YES: Go to Step 2.
2. NO: Repair the CAN bus line (Refer to DIAGNOSIS ).
STEP 2. Using scan tool (M.U.T.-III), DTC check.
Check that the diagnostic trouble code related to the air conditioning is not stored.

Q: Is the diagnostic trouble code stored?
1. YES: Carry out the diagnostic trouble code procedures. Refer to DIAGNOSTIC TROUBLE CODE CHART .
2. NO: Go to Step 3.
STEP 3. Check the blower relay.
Refer to A/C COMPRESSOR RELAY CONTINUITY CHECK .

Q: Is the blower relay in good condition?
1. YES: Go to Step 4.
2. NO: Replace the blower relay.
STEP 4. Check the blower motor.
Refer to << A >> AIR MIXING DAMPER CONTROL MOTOR, OUTSIDE/INSIDE AIR SELECTION DAMPER CONTROL MOTOR, MODE SELECTION DAMPER CONTROL MOTOR REMOVAL .

Q: Is the check result normal?
1. YES: Go to Step 5.
2. NO: Replace the blower motor.
STEP 5. Voltage measurement at blower motor connector.
1. Disconnect the connector, and measure at the wiring harness side.
2. Turn the ignition switch to the ON position.
3. Voltage between terminal 1 and body ground.
  OK: System voltage
Q: Is the check result normal?
1. YES: Go to Step 6.
2. NO: INSPECTION PROCEDURE 10: Refer to "INSPECTION PROCEDURE 10: Blower motor power supply system " .
STEP 6. Resistance measurement at the power transistor connector.
1. Disconnect the connector, and measure at the wiring harness side.
2. Continuity between terminal 1 and body ground
  OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
1. YES: Go to Step 7.
2. NO: Repair the wiring harness wires between power transistor connector terminal and body ground.
STEP 7. Check of open circuit in power transistor power supply line between blower motor and power transistor connector.
Q: Is the check result normal?
1. YES: Go to Step 8.
2. NO: Repair the connector(s) or wiring harness.
STEP 8. Check of open circuit in P/TB and P/TC line between blower motor, power transistor and heater controller assembly (A/C-ECU) connector.
Q: Is the check result normal?
1. YES: Go to Step 9.
2. NO: Repair the connector(s) or wiring harness.
STEP 9. Replace the power transistor and recheck the trouble symptom
Check that the blower motor operates normally.

Q: Is the check result normal?
1. YES: This diagnosis is complete.
2. NO: Replace the heater controller assembly (A/C-ECU).