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
(A115) FUSED B(+) CIRCUIT OPEN OR SHORTED
(Z905) GROUND CIRCUIT OPEN
(F943) FUSED IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN OR SHORTED
(D52) CAN C BUS (+) CIRCUIT OPEN
(D51) CAN C BUS (-) CIRCUIT OPEN
INTEGRATED TRAILER BRAKE MODULE (ITBM)

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. With 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.
  
  NOTE:
  Check the TIPM for any active CAN C hardware DTCs, perform DTC before proceeding.
  
  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 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.
(A115) FUSED B(+) CIRCUIT OPEN OR SHORTED

Fig 1: Using 12-Volt Test Light To Check Fused B (+) Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the ITBM C1 harness connector.
3. Using a 12-volt test light connected to ground, check the (A115) Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3.
  No
  - Repair the open or short in the (A115) Fused B(+) circuit.
  - Perform the ITBM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST .
(Z905) GROUND CIRCUIT OPEN

Fig 2: Using 12-Volt Test Light To Check Ground Circuit
Courtesy of CHRYSLER LLC
1. Using a 12-volt test light connected to 12-volts, check the (Z905) Ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4.
  No
  - Repair the open in the (Z905) Ground circuit.
  - Perform the ITBM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST .
(F943) FUSED IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN OR SHORTED

Fig 3: Using 12-Volt Test Light To Check Fused Ignition Run/Start Control Output Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (F943) Fused Ignition Run/Start Control Output circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5.
  No
  - Repair the open or short in the (F943) Fused Ignition Run/Start Control Output circuit.
  - Perform the ITBM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST .
(D52) CAN C BUS (+) CIRCUIT OPEN

Fig 4: Measuring Resistance Of CAN C Bus (+) Circuit Between TIPM harness Connector & ITBM C2 Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the TIPM C7 harness connector.
3. Measure the resistance of the (D52) CAN C Bus (+) circuit between the TIPM C7 harness connector and the ITBM C2 harness connector.
  Is resistance below 5.0 Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the open in the (D52) CAN C Bus (+) circuit.
  - Perform the ITBM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST .
(D51) CAN C BUS (-) CIRCUIT OPEN

Fig 5: Measuring Resistance Of CAN C Bus (-) Circuit Between TIPM Harness Connector & ITBM Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (D51) CAN C Bus (-) circuit between the TIPM C7 harness connector and the ITBM C2 harness connector.
  Is resistance below 5.0 Ohms?
  
  Yes
  - Replace the ITBM in accordance with the Service Information.
  - Perform the ITBM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST .
  No
  - Repair the open in the (D51) CAN C Bus (-) circuit.
  - Perform the ITBM VERIFICATION TEST. Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST .