Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. 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 CIRCUITS OPEN
(F921) FUSED IGNITION RUN CONTROL OUTPUT CIRCUIT OPEN OR SHORTED
(D264) AND (D265) CAN INTERIOR (IHS) BUS (125K) CIRCUITS OPEN
A/C HEATER CONTROL MODULE

TEST FOR INTERMITTENT CONDITION
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. Using the scan tool, select ECU View.
  NOTE:
  A red "X" will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.
  
  Does the scan tool display a red "X" next to the module?
  
  Yes
  - Go To 2.
  No
  - The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched and partially broken wires and the wiring harness connectors for broken, bent, pushed out and corroded terminals.
(A417) FUSED B(+) CIRCUIT OPEN OR SHORTED

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 HVAC C1 harness connectors.
3. Using a 12-volt test light connected to ground, check the (A417) Fused B(+) circuit.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go To 3.
  No
  - Repair the (A417) Fused B(+) circuit for an open or short.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(Z911) GROUND CIRCUIT 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 for each circuit?
  
  Yes
  - Go To 4.
  No
  - Repair the (Z911) ground circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(F921) FUSED IGNITION RUN CONTROL OUTPUT CIRCUIT OPEN OR SHORTED

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 (F921) Fused Run Relay Output circuit for an open or short.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
(D265) OR (D264) CAN IHS BUS (125K) CIRCUIT 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 IHS Bus (-) (125K) circuit between the TIPM C7 harness connector and the HVAC C1 harness connector.
2. Measure the resistance of the (D265) CAN IHS Bus (+) (125K) circuit between the TIPM C7 harness connector and the HVAC C1 harness connector.
  Is resistance below 5.0 Ohms on both circuits?
  
  Yes
  - Replace the A/C Heater Control Module in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the (D265) or (D264) CAN IHS Bus (125K) circuit for an open. Inspect the connector for damage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .