Pinpoint Test 12: The Blower Motor Is Inoperative

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PINPOINT TEST 12: THE BLOWER MOTOR IS INOPERATIVE - HYBRID

Refer to the Tribute Wiring Diagrams for schematic and connector information.

Normal Operation

Under normal operation, the blower motor relay coil and switch is supplied voltage. When the blower motor relay coil receives a ground from the HVAC module, the relay coil is energized and voltage is delivered to the blower motor and the blower motor speed control from the relay. Ground is provided from the blower motor speed control. The HVAC module sends a Pulse Width Modulated (PWM) signal to the blower motor speed control to control the blower speed.

- DTC B10AF:12 (Blower Fan Relay: Circuit Short to Battery) - The module senses excessive voltage on the relay coil ground circuit, indicating a short directly to voltage.
- DTC B10AF:14 (Blower Fan Relay: Circuit Short to Ground or Open) - The module senses no voltage on the relay coil ground circuit, indicating an open or a short directly to ground.
- DTC B10B9:14 (Blower Control: Circuit Short to Ground or Open) - The module senses no voltage on the blower motor control PWM circuit, indicating an open or a short directly to ground.

Possible Causes
- Fuse(s)
- Wiring, terminals or connectors
- Blower motor relay
- Blower motor speed control
- HVAC module - Dual Automatic Temperature Control (DATC)
- Blower motor

Diagnostic Procedure

Step 1-Step 4:

Step 5-Step 9:

Step 10-Step 13:

Step 14: