PINPOINT TEST A : The Auxiliary Blower Motor Is Inoperative: Notes
Diagnostic Overview
The Auxiliary Blower Motor Is Inoperative
Refer to AUXILIARY CLIMATE CONTROL SYSTEM for schematic and connector information.
Normal Operation and Fault Conditions
The auxiliary blower motor relay coil receives a ground from the HVAC module. When the relay coil is energized, voltage is delivered from the relay to the auxiliary blower motor speed control and auxiliary blower motor. The auxiliary blower motor speed control is grounded. The HVAC module provides a PWM signal to the auxiliary blower motor speed control to control the blower speed. Ground for the motor is provided from the auxiliary blower motor speed control.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10B0:12 | Rear Blower Fan Relay: Circuit Short to Battery | This CMDTC sets when the HVAC module senses a short to voltage on the relay coil ground circuit when the module is grounding the circuit. |
| B10B0:13 | Rear Blower Fan Relay: Circuit Open | This CMDTC sets when the HVAC module senses no voltage on the relay coil ground circuit. |
| B10BA:14 | Rear Blower Control: Circuit Short to Ground or Open | This CMDTC sets when the HVAC module senses no voltage or an open on the blower motor control PWM circuit. |
Visual Inspection and Diagnostic Pre-checks
- Inspect BJB fuses 39 (40A) and 93 (5A)