B1002

B1002-A/C SWITCH REQUEST INPUT CIRCUIT HIGH (CCN)





For a complete wiring diagram Refer to Diagrams/Electrical.


- 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.








Diagnostic Test


1. VERIFY DTC B1002-A/C SWITCH REQUEST INPUT CIRCUIT HIGH IS ACTIVE
Turn the ignition on.
With the scan tool, erase DTCs.
Turn the ignition off, wait 10 seconds, and turn the ignition on.
With the scan tool, read DTCs.
Does the scan tool display this DTC as active?

Yes


- Go To 2


No


- 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. Body Verification Test.




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




Turn the ignition off.
Disconnect the Instrument Cluster C2 harness connector.
Disconnect the HVAC Control Head C1 harness connector.
Turn the ignition on.
Measure the voltage of the (C105) HVAC MUX Control circuit.
Is there any voltage present?

Yes


- Repair the (C105) HVAC MUX Control circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.


No


- Go To3




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




Turn the ignition off.
Measure the resistance of the (C105) HVAC MUX Control circuit between the A/C Heater Control C1 harness connector and the Instrument Cluster C2 harness connector.
Does the ohm meter read open circuit?

Yes


- Repair the (C105) HVAC MUX Control circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.


No


- Go To5




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




Measure the resistance of the (C955) HVAC MUX Return circuit between the A/C Heater Control C1 harness connector and the Instrument Cluster C2 harness connector.
Does the ohm meter read open circuit?

Yes


- Repair the (C955) HVAC MUX Return circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.


No


- Go To5




5. CHECK THE OPERATION OF THE INSTRUMENT CLUSTER (CCN)
Reconnect the Instrument Cluster (CCN) harness connector.
Turn the ignition on.
With the scan tool, read DTCs.
Does the scan tool display this DTC as active?

Yes


- Replace the Instrument Cluster (CCN).
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.


No


- Replace the HVAC control head.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.