Diagnostic Test

VERIFY DTC B1002-A/C SWITCH REQUEST INPUT CIRCUIT HIGH IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, erase CCN DTCs.
3. Turn the ignition off, wait 10 seconds, and turn the ignition on.
4. With the scan tool, read CCN DTCs.
  Does the scan tool display active: B1002-A/C SWITCH REQUEST INPUT CIRCUIT HIGH?
  
  Yes
  - Go to step 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. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
CHECK THE (C105) HVAC MUX CONTROL CIRCUIT VOLTAGE AT A/C HEATER CONTROL C1 HARNESS CONNECTOR

Fig 1: Checking HVAC MUX Control Circuit Voltage At A/C Heater Control C1 Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the A/C Heater Control C1 harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (C105) HVAC MUX Control circuit.
  What is the voltage?
  
  Below 4.8 Volts
  - Go to step 3
  4.8 to 5.2 Volts
  - Go to step 4
  Above 5.2 Volts
  - Go to step 6
CHECK THE (C105) HVAC MUX CONTROL CIRCUIT FOR AN OPEN

Fig 2: Checking HVAC MUX Control Circuit For An Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Instrument Cluster C4 harness connector.
3. Measure the resistance of the (C105) HVAC MUX Control circuit between the A/C Heater Control C1 harness connector and the Instrument Cluster C4 harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Replace the Instrument Cluster (CCN) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Repair the (C105) HVAC MUX Control circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
CHECK THE (C955) HVAC MUX RETURN CIRCUIT OPERATION

Fig 3: Checking HVAC MUX Return Circuit Operation
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Using a 12-volt test light connected to 12 volts, back probe the (C955) HVAC MUX Return circuit in the A/C Heater Control C1 harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Replace the A/C-Heater Control in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Go to step 5
CHECK THE (C955) HVAC MUX RETURN CIRCUIT FOR AN OPEN

Fig 4: Checking HVAC MUX Return Circuit For An Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (C955) HVAC MUX Return circuit between the A/C Heater Control C1 harness connector and the Instrument Cluster C4 harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Replace the Instrument Cluster in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Repair the (C955) HVAC MUX Return circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
CHECK THE (C105) HVAC MUX CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

Fig 5: Checking HVAC MUX Control Circuit For A Short To Voltage
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Instrument Cluster C4 harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (C105) HVAC MUX Control circuit.
  Is the voltage above 0.2 volts?
  
  Yes
  - Repair the (C105) HVAC MUX Control circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Replace the Instrument Cluster (CCN) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .