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
Required Special Tool:
MB991223: Harness Set
MB992006: Extra Fine Probe
STEP 1. Check the blower motor power supply circuit (connector, ground terminal).
Check that the blower motor connector C-249, blower relay connector C-402 are connected securely and that the ground terminal No.3 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.
caution
Do 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 ).