Pinpoint Test K : The Front Blower Motor Is Inoperative: Notes
Refer to Wiring Diagrams Automatic Climate Control System for schematic and connector information.
Normal Operation and Fault Conditions
Voltage is supplied to the blower motor relay switched contact from the BJB. Ground to the relay coil is a dedicated circuit. When the blower motor relay coil receives power from the FCIM, the relay coil is energized and voltage is delivered to the blower motor control module. Power and ground for the blower motor is provided by the blower motor control module. The FCIM sends a PWM signal to the blower motor control module to control the blower speed. The blower motor and the blower motor speed control are combined into one assembly called the blower motor control module. The blower motor relay is a non serviceable part of the printed circuit board on the BJB.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10AF:11 | Blower Fan Relay: Circuit Short To Ground | This DTC sets when the module senses low voltage on the blower motor relay coil voltage circuit when the module is energizing the circuit. The blower motor relay is permanently inactive. |
| B10AF:15 | Blower Fan Relay: Circuit Short To Battery or Open | This DTC sets when the module senses greater than expected voltage on the blower motor relay coil voltage circuit, indicating an open circuit or a short to voltage. The blower motor relay is inactive when circuit is open; the blower motor relay is on all the time when shorted to battery. |
| B10B9:12 | Blower Control: Circuit Short To Battery | This DTC sets when the module senses high voltage on the blower motor control PWM circuit, indicating a short directly to voltage. The blower motor is inoperative. |
| B10B9:14 | Blower Control: Circuit Short To Ground or Open | This DTC sets when the module senses no voltage on the blower motor control PWM circuit, indicating a short directly to ground or an open circuit. The blower motor runs at full speed if the circuit is shorted to ground. The blower motor is inoperative if the circuit is open. |
Possible Sources
- Wiring, terminals or connectors
- Fuse
- Blower motor relay
- Blower motor control module
- FCIM
Visual Inspection and Diagnostic Pre-checks
- Inspect BJB fuse 20 (40A).