2007 Commander XK Factory Service Manual 24 - HEATING & AIR CONDITIONING

B1001-A/C SWITCH REQUEST INPUT CIRCUIT LOW (ATC)

For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The switch input changes when the switch is pushed down. A stored DTC B1001 indicates that the A/C mode switch was stuck in a pushed position for more than 10 minutes, but has since returned to its normal state. An active DTC B1001 indicates that the A/C mode switch is stuck in a pushed position. An active DTC B1001 will prevent proper A/C mode switch and status indicator function.



Possible Causes
  
A/C HEATER CONTROL DAMAGED
  
OBJECT HOLDING A/C MODE SWITCH IN A PUSHED POSITION
  
SUBSTANCE CAUSING A/C MODE SWITCH TO GET STUCK IN A PUSHED POSITION
  
A/C HEATER CONTROL
  



Diagnostic Test

1. INSPECT THE A/C HEATER CONTROL FOR DAMAGE

Inspect the A/C Heater Control for damage.

Is the A/C Heater Control damaged?

Yes


No

2. INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE A/C MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION

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

3. CHECK FOR NORMAL A/C MODE SWITCH & STATUS INDICATOR FUNCTION

Turn the ignition on.
Set the Blower control to any position except Off.
Set the Mode control to any position except Auto.
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


No

4. VERIFY THAT DTC B1001–A/C SWITCH REQUEST INPUT CIRCUIT LOW IS STILL ACTIVE

With the scan tool, erase HVAC DTCs.
Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait 10 minutes before proceeding.
With the scan tool, read HVAC DTCs.

Does the scan tool display active: B1001–A/C SWITCH REQUEST INPUT CIRCUIT LOW?

Yes


No