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DTC B1193 HVAC Blower Motor Anomalous Temperature
 
 
 
 
DTC SET CONDITION
DTC No. B1193 will be set when the temperature abnormality signal is received from the blower motor.
 
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the blower motor power circuit
  • Malfunction of the blower motor
  • Adhesion of foreign materials to the blower motor heat sink
  • The A/C air flow passage is clogged
  • Malfunction of the A/C controller assembly (A/C-ECU)
 
 
 
DIAGNOSIS
STEP 1. Check the blower motor power supply circuit (connector, ground terminal).
Check that the blower motor connector, blower relay connector are connected securely and that the ground terminal is not floating.
Is the check result normal?
Go to Step 2.
Repair or replace the wiring harness or connector(s) or ground terminal.
 
STEP 2. Check the blower motor and blower case assembly.
cautionDo not use parts cleaner to remove the foreign materials adhered to the blower motor fin (heat sink) because the cooling grease applied to the connection of the blower motor and the blower motor fin (heat sink) may be removed.
Remove the blower motor, and check the blower motor fin (heat sink) for adhesion of foreign materials.
Is the check result normal?
Go to Step 3.
Remove the foreign materials.
 
STEP 3. Check the A/C air flow passage for clogging.
Check the front deck, inside/outside air introduction passage, clean air filter and blower case for foreign materials.
Is the check result normal?
Go to Step 4..
Remove the foreign materials.
 
STEP 4. Check whether the DTC is set again.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Ignition switch: "LOCK" (OFF) to "ON"
(3) I continue the following condition more than 20 minutes.
  • Air conditioning switch: OFF
  • Blower knob: Maximum air volume
  • Air outlets: FACE
(4) Check if the DTC is set.
Is the DTC set?
Go to Step 5.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
 
STEP 5. Check whether the DTC is set again.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Ignition switch: "ON" to "LOCK" (OFF)
(3) Disconnect the blower motor connector.
(4) Ignition switch: "LOCK" (OFF) to "ON"
(5) Check if the DTC is set.
Is the DTC set?
Replace the A/C controller assembly (A/C-ECU).
Replace the blower motor.