Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSDODGE AND RAM2010CHARGER SE, 5.7 TREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMS(HVAC SYSTEMS (ATC) - ELECTRICAL DIAGNOSTICS)DTC TROUBLESHOOTINGB100A-RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOWDIAGNOSTIC TEST

2010 Dodge and Ram Charger SE, 5.7 T

Diagnostic Test

2010 Dodge and Ram Charger SE, 5.7 TSECTION Diagnostic Test

INSPECT THE A/C HEATER CONTROL FOR DAMAGE
1. Inspect the A/C Heater Control for damage.
  Is the A/C Heater Control damaged?
  
  Yes
  - Replace the A/C Heater Control in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
  No
  - Go to step 2
INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE RECIRCULATION MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION
1. Inspect the A/C Heater Control for anything that would cause the Recirculation mode switch to stay or stick in a pushed position.
  Is anything present that would cause the Recirculation mode switch to stay or stick in a pushed position?
  
  Yes
  - Repair as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
  No
  - Go to step 3
CHECK FOR NORMAL RECIRCULATION MODE SWITCH AND STATUS INDICATOR FUNCTION
1. Turn the ignition on.
2. Set the Mode control to any position between Panel and Floor.
3. Press the Recirculation mode switch on and off several times while observing the Recirculation status indicator.
  Does the Recirculation status indicator turn on and off?
  
  Yes
  - Go to step 4
  No
  - Replace the A/C Heater Control in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
VERIFY THAT DTC B100A-RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW IS STILL ACTIVE
1. With the scan tool, erase HVAC DTCs.
2. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait 10 minutes before proceeding.
3. With the scan tool, read HVAC DTCs.
  Does the scan tool display active: B100A-RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW?
  
  Yes
  - Replace the A/C Heater Control in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
  No
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.