LEMON Manuals: Even more car manuals for everyone
Home >> Chrysler >> 2009 >> PT Cruiser Limited >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> (Cabin Compartment Node (CCN) - Electrical Diagnostics) >> DTC Troubleshooting >> U1149-Lost Communication With MULTIFUNCTION Switch >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    NOTE: Before proceeding with this diagnostic procedure, verify the Left and Right Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set.
    1. Turn the ignition on.
    2. With the scan tool, read DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go to step  2

      No 

      • Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
  2. (D506) LIN BUS CIRCUIT OPEN 
    Fig 1: Left Multifunction Switch C1 Harness Connector
    GC0117603Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Left Multifunction Switch C1 harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (D506) LIN BUS circuit.

      Is the voltage above 5.0 volts?

      Yes 

      • Go to step  3

      No 

  3. (F20) IGNITION SWITCH OUTPUT (RUN/START) CIRCUIT OPEN 
    Fig 2: Checking Ignition Switch Output (Run/Start) Circuit Open
    GC0117604Courtesy of CHRYSLER LLC
    1. Measure the voltage of the (F20) Ignition Switch Output (RUN/START) circuit.

      Is the voltage above 10.0 volts?

      Yes 

      • Go to step  4

      No 

  4. (A411) FUSED B+ (I.O.D.) CIRCUIT OPEN 
    Fig 3: Checking Fused B+ (I.O.D.) Circuit Open
    GC0117605Courtesy of CHRYSLER LLC
    1. Measure the voltage of the (A411) Fused B+ (I.O.D.) circuit.

      Is the voltage above 10.0 volts?

      Yes 

      • Go to step  5

      No 

  5. (Z906) GROUND CIRCUIT OPEN 
    Fig 4: Checking Ground Circuit Open
    GC0117606Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Measure the resistance between ground and the (Z906) Ground circuit.

      Is the resistance below 10K Ohms?

      Yes 

      No