B1001–A/C SWITCH REQUEST INPUT CIRCUIT LOW (CCN)





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    With the ignition on.

  • Set Condition:

    If the Instrument Cluster (CCN) detects voltage below 0.55 volts for 10 seconds on the (C105) HVAC MUX Control circuit.


Possible Causes
  
(C105) HVAC MUX CONTROL CIRCUIT SHORTED TO GROUND
  
(C105) HVAC MUX CONTROL CIRCUIT SHORTED TO (Z936) GROUND CIRCUIT
  
(C105) HVAC MUX CONTROL CIRCUIT SHORTED TO (C955) HVAC MUX RETURN CIRCUIT
  
INSTRUMENT CLUSTER (CCN)
  
A/C HEATER CONTROL
  



Diagnostic Test

1.VERIFY DTC B1001–A/C SWITCH REQUEST INPUT CIRCUIT LOW IS ACTIVE






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

Yes
  • Go To 2


No
  • The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
  • Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

2.CHECK FOR B1001–A/C SWITCH REQUEST INPUT CIRCUIT LOW WITH A/C HEATER CONTROL C1 HARNESS CONNECTOR DISCONNECTED










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

Yes
  • Go To 3


No

3.CHECK THE (C105) HVAC MUX CONTROL CIRCUIT FOR A SHORT TO GROUND







Does the ohm meter read open circuit?

Yes
  • Go To4


No

4.CHECK THE (C105) HVAC MUX CONTROL CIRCUIT FOR A SHORT TO THE (Z936) GROUND CIRCUIT & THE (C955) HVAC MUX RETURN CIRCUIT






Does the ohm meter read open circuit?

Yes


No