B106E - Rear Blower Control Circuit/Performance: Notes
For a complete wiring diagram, refer to the appropriate SYSTEM WIRING DIAGRAMS information.
Theory Of Operation
The Rear A/C Heater Control works in conjunction with the A/C Heater Control to control the rear blower motor, rear temperature control and rear mode control. The Rear A/C Heater Control is constantly monitored by the A/C Heater Control for proper operation. If the monitored signal circuits are out of a calibrated range a DTC will set. For further information, refer to HVAC .
- When Monitored: With the ignition on.
- Set Condition: If the A/C Heater Control detects a short to ground on the Rear Blower Signal circuit. If a valid voltage is detected for one second the DTC will change from active to stored and stay in the controllers memory for 100 consecutive ignition cycles.
| Possible Causes |
|---|
| REAR A/C HEATER CONTROL DISCONNECTED |
| REAR BLOWER SIGNAL CIRCUIT SHORTED TO GROUND |
| REAR BLOWER SIGNAL CIRCUIT OPEN |
| 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND |
| 5-VOLT SUPPLY CIRCUIT OPEN |
| REAR A/C HEATER CONTROL |
| A/C HEATER CONTROL |
Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to HVAC .