B1002–A/C SWITCH REQUEST INPUT CIRCUIT HIGH (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 above 4.5 volts for 10 seconds on the (C105) HVAC MUX Control circuit.


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



Diagnostic Test

1.VERIFY DTC B1002–A/C SWITCH REQUEST INPUT CIRCUIT HIGH IS ACTIVE






Does the scan tool display active: B1002–A/C SWITCH REQUEST INPUT CIRCUIT HIGH?

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 THE (C105) HVAC MUX CONTROL CIRCUIT VOLTAGE AT A/C HEATER CONTROL C1 HARNESS CONNECTOR








What is the voltage?

Below 4.8 Volts
  • Go To 3


4.8 to 5.2 Volts
  • Go To 4


Above 5.2 Volts
  • Go To 6

3.CHECK THE (C105) HVAC MUX CONTROL CIRCUIT FOR AN OPEN







Does the ohm meter read open circuit?

Yes


No

4.CHECK THE (C955) HVAC MUX RETURN CIRCUIT OPERATION






Does the volt meter read above 4.5 volts?

Yes


No
  • Go To 5

5.CHECK THE (C955) HVAC MUX RETURN CIRCUIT FOR AN OPEN





Does the ohm meter read open circuit?

Yes


No

6.CHECK THE (C105) HVAC MUX CONTROL CIRCUIT FOR A SHORT TO VOLTAGE








Is the voltage above 1.0 volts?

Yes


No