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.

Possible Causes
(A417) FUSED B(+) CIRCUIT OPEN OR SHORTED
(Z911) GROUND CIRCUIT OPEN
(F921) FUSED RUN RELAY OUTPUT CIRCUIT OPEN OR SHORTED
(D264) AND (D265) CAN INTERIOR BUS (125K) CIRCUITS OPEN
A/C HEATER CONTROL MODULE (HVAC)

TEST FOR INTERMITTENT CONDITION
NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
1. Turn the ignition on.
  NOTE:
  Make sure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, read the module status.
  NOTE:
  Check the TIPM for any active CAN hardware DTCs, perform DTC before proceeding.
  
  Does the scan tool indicate that the module is active on the bus?
  
  Yes
  - The no response condition is 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.
  No
  - Go To 2.
CHECK THE (A417) FUSED B(+) CIRCUIT FOR AN OPEN OR SHORT

Fig 1: Using 12-volt Test Light Connected To Ground To Check Fused B(+) Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the A/C Heater Control harness connector.
3. Using a 12-volt test light connected to ground, check the (A417) Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3.
  No
  - Repair the open or short in the (A417) Fused B(+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z911) GROUND CIRCUIT FOR AN OPEN

Fig 2: Using 12-volt Test Light Connected To 12-volts To Check Ground Circuit
Courtesy of CHRYSLER LLC
1. Using a 12-volt test light connected to 12-volts, check the (Z911) Ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4.
  No
  - Repair the open in the (Z911) Ground circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (F921) FUSED RUN RELAY OUTPUT CIRCUIT FOR AN OPEN OR SHORT

Fig 3: Using 12-volt Test Light Connected To Ground To Check Fused Run Relay Output Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (F921) Fused Run Relay Output circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5.
  No
  - Repair the open or short in the (F921) Fused Run Relay Output circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (D265) AND (D264) CAN INTERIOR BUS (125K) CIRCUITS FOR AN OPEN

Fig 4: Measuring Resistance Of CAN Interior Bus (-)/(+) Circuit Between TIPM Harness Connector And HVAC Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (D264) CAN Interior Bus (125K) (-) circuit between the TIPM C7 harness connector and the A/C Heater Control harness connector.
2. Measure the resistance of the (D265) CAN Interior Bus (125K) (+) circuit between the TIPM C7 harness connector and the A/C Heater Control harness connector.
  Are the resistances below 5.0 Ohms?
  
  Yes
  - Replace the A/C Heater Control Module in accordance with the Service Information. Refer to CONTROL, A/C and Heater , Removal .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the open in the (D265) or (D264) CAN Interior Bus (125K) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .