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DTC B1191 HVAC Blower Motor Input Voltage Fail
 
 
 
 
 
 
DTC SET CONDITION
DTC No. B1191 will be set when the voltage abnormality signal is received from the blower motor.
 
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the blower motor power circuit
  • Malfunction of the blower motor
  • Malfunction of the blower motor relay
  • Malfunction of the A/C controller assembly (A/C-ECU)
 
 
 
DIAGNOSIS
Required Special Tool:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Measure the voltage between blower motor connector C-249 terminal No.1 by backprobing.
(1) Voltage between blower motor terminal No.1 and body ground.
(2) Ignition switch: "ON"
OK: System voltage
Is the check result normal?
Go to Step 4.
Go to Step 2.
 
STEP 2. Check of damage in blower motor line between No.1 connector terminal and ETACS-ECU.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Check the blower motor relay.
Refer to GROUP 00E - How to Use Troubleshooting/Inspection Service Points - Relay Check .
Is the check result normal?
Go to Step 4..
Replace the blower motor relay.
 
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) 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"
(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.