55-B1191 BLOWER MOTOR VOLTAGE ERROR

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

DIAGNOSIS

STEP 1. Measure the voltage between blower motor connector terminal M+ by backprobing.

(1) Voltage between blower motor terminal M+ and body ground.

(2) Ignition switch: "ON"

OK: The voltage should measure approximately 12 volts (battery positive voltage)

Is the check result normal?

Go to Step 4

Go to Step 2

STEP 2. Check of damage in blower motor line between M+ 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" (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.