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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 334 ((HVAC Systems (ATC) - Electrical Diagnostics)) >> DTC Troubleshooting >> B1001-A/C Switch Request Input Circuit Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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 

      No 

      • Go to step  2
  2. INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE A/C MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION 
    1. Inspect the A/C Heater Control for anything that would cause the A/C mode switch to stay or stick in a pushed position.

      Is anything present that would cause the A/C mode switch to stay or stick in a pushed position?

      Yes 

      No 

      • Go to step  3
  3. CHECK FOR NORMAL A/C MODE SWITCH AND STATUS INDICATOR FUNCTION 
    1. Turn the ignition on.
    2. Set the Blower control to any position except Off.
    3. Set the Mode control to any position except Auto.
    4. Press the A/C mode switch on and off several times while observing the A/C status indicator.

      Does the A/C status indicator turn on and off?

      Yes 

      • Go to step  4

      No 

  4. VERIFY THAT DTC B1001-A/C 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: B1001-A/C SWITCH REQUEST INPUT CIRCUIT LOW?

      Yes 

      No 

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