Pinpoint Test 12: The Blower Motor Is Inoperative - DATC
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PINPOINT TEST 12: THE BLOWER MOTOR IS INOPERATIVE - DATC - 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 speed control module through circuit (Y/G). Ground for the motor is provided through circuit (Y/L) from the blower motor speed control module. Ground for the blower motor speed control module is provided by circuit (B/G). The DATC module sends a pulse width modulated signal to the blower motor speed control module through circuit (W/V) to control the blower speed.
- DTC B12AF Front Blower Motor Relay Drive Circuit Shorted to Battery Voltage - The module senses excessive voltage on the relay coil ground circuit, indicating a short directly to voltage.
- DTC B12B0 Front Blower Motor Relay Drive Circuit Open or Shorted to Ground - The module senses no voltage on the relay coil ground circuit, indicating an open or a short directly to ground.
- DTC B12B2 Front Blower Motor PWM Drive Circuit Open or Shorted to Ground - The module senses no voltage on the blower motor control pulse width modulation (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 module
- Blower motor
- DATC module
Diagnostic Procedure
Step 1-Step 4:
Step 5-Step 8:
Step 9-Step 13:
