B11D9-92-BLOWER SPEED KNOB REQUEST INPUT - PERFORMANCE OR INCORRECT OPERATION
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The A/C Heater Control constantly monitors the Blower Motor switch or dial for proper operation. If the monitored voltage on that circuit drops below or rises above a predetermined value, a DTC will set.
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When Monitored:
With the ignition on.
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Set Condition:
If the internal blower circuit is less than 0.05 volts or greater than 4.95 volts for a period of two seconds.
Possible Causes |
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| A/C HEATER CONTROL |
Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
REPLACE THE A/C HEATER CONTROL
This DTC detects a problem with an internal circuit in the controller and is non serviceable.
Repair
- Replace and program the A/C Heater Control in accordance with the Service Information. (Refer to 24 - Heating and Air Conditioning/Controls/CONTROL, A/C and Heater - Removal) .
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .