Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

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: Checking Fused B(+) Circuit For An Open Or Short
Courtesy of CHRYSLER GROUP, 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.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
CHECK THE (Z911) GROUND CIRCUIT FOR AN OPEN

Fig 2: Checking Ground Circuit For An Open
Courtesy of CHRYSLER GROUP, 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.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
CHECK THE (F921) FUSED RUN RELAY OUTPUT CIRCUIT FOR AN OPEN OR SHORT

Fig 3: Checking Fused Run Relay Output Circuit For An Open Or Short
Courtesy of CHRYSLER GROUP, 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.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
CHECK THE (D265) AND (D264) CAN INTERIOR BUS (125K) CIRCUITS FOR AN OPEN

Fig 4: Checking CAN Interior BUS Circuits For An Open
Courtesy of CHRYSLER GROUP, 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 .
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
  No
  - Repair the open in the (D265) or (D264) CAN Interior Bus (125K) circuit.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.