Pinpoint Test 13: The Blower Motor Does Not Operate Correctly
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PINPOINT TEST 13: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY - HYBRID
Normal Operation
The blower motor relay coil receives ground from the dual automatic temperature control (DATC) module through circuit (V/G). The coil receives ignition voltage through circuit (G/BR). Voltage is supplied to the relay switch contact. When the relay coil is energized, voltage is delivered to the blower motor and the blower motor control module through circuit (Y/G). Ground for the motor is provided through circuit (Y/L) from the blower motor control module. Ground for the blower motor control module is provided by circuit (B/G). The DATC module sends a pulse width modulation (PWM) signal to the blower motor control module through circuit (W/V) to control the blower speed.
- DTC B12B1 (Front Blower Motor PWM Drive Circuit Shorted to Voltage) - The module senses excessive voltage on the blower motor control PWM circuit, indicating a short directly to voltage.
Possible Causes
- Wiring, terminals or connectors
- Blower motor control module
- DATC module
Diagnostic Procedure
