Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY THE DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, read HVAC DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2.
  No
  - Go To 7.
CHECK FOR ACTIVE CAN BUS RELATED DTCS IN THE TOTALLY INTEGRATED POWER MODULE (TIPM)
1. With the scan tool, read the Totally Integrated Power Module (TIPM) DTCs.
  Does the scan tool display any active CAN BUS related DTCs?
  
  Yes
  - Refer to appropriate Electrical Diagnostic Information and perform the appropriate diagnostic procedure .
  No
  - Go To 3.
CHECK (D265) CAN INTERIOR BUS (+) CIRCUIT FOR AN OPEN

Fig 1: Checking CAN Interior Bus (+) Circuit For Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Disconnect the negative battery cable.
3. Disconnect the A/C Heater Control C1 harness connector.
4. Disconnect the Totally Integrated Power Module (TIPM) C7 harness connector.
5. Measure the resistance of the (D265) CAN Interior Bus (125K) (+) circuit between the Totally Integrated Power Module (TIPM) C7 harness connector and the A/C Heater Control C1 harness connector.
  Is the resistance below 1.0 Ohm?
  
  Yes
  - Go To 4.
  No
  - Repair the (D265) CAN Interior Bus (125K) (+) circuit for an open.
  - Perform HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
CHECK (D264) CAN INTERIOR BUS (-) CIRCUIT FOR AN OPEN

Fig 2: Checking CAN Interior Bus (-) Circuit For Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (D264) CAN Interior Bus (125K) (-) circuit between the Totally Integrated Power Module (TIPM) C7 connector and the A/C Heater Control C1 harness connector.
  Is the resistance below 1.0 Ohm?
  
  Yes
  - Go To 5.
  No
  - Repair the (D264) CAN Interior Bus (125K) (-) circuit for an open.
  - Perform HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
CHECK (D265) CAN C INTERIOR BUS (125K) (+) CIRCUIT FOR A SHORT TO GROUND

Fig 3: Checking CAN C Interior Bus (125k) (+) Circuit For Short
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (D265) CAN C Interior Bus (125K) (+) circuit in the A/C Heater Control C1 harness connector.
  Is the resistance above 100k Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the (D265) CAN C Interior Bus (125K) (+) circuit for a short to ground.
  - Perform HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
CHECK (D264) CAN C INTERIOR BUS (-) CIRCUIT FOR A SHORT TO GROUND

Fig 4: Checking CAN C Interior Bus (-) Circuit For Short
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (D264) CAN C Interior Bus (125K) (-) circuit.
  Is the resistance above 100k Ohms?
  
  Yes
  - Replace the A/C Heater Control in accordance with the Service Information.
  - Perform HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Repair the (D264) CAN C Interior Bus (125K) (-) circuit for a short to ground.
  - Perform HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, partially broken wires.
4. Check the connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
5. Wiggle the wiring and connectors while checking for shorted and open circuits.
6. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  No
  - Test complete.