Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY THE DTC IS ACTIVE
NOTE:
The appropriate trailer must be present for the results of this test to be valid.

NOTE:
This DTC must be active for the results of this test to be valid.
1. Connect the trailer to the vehicle.
2. Ignition on, engine not running.
3. With the scan tool, record and erase DTCs.
4. Cycle the ignition switch from off to on.
5. With the scan tool, read DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go To 2
  No
  - Go To 7
TRAILER WIRING/BRAKES
1. Turn ignition off to the lock position.
2. Disconnect the trailer from the vehicle.
3. Ignition on, engine not running.
4. With the scan tool, record and erase DTCs.
5. Cycle the ignition switch from off to on.
  Does the ITBM display "CF"?
  
  Yes
  - Go To 3
  No
  - Trailer wiring/brakes are in operative, refer the customer to an authorized trailer dealer.
(F944) IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE
1. Turn ignition off to the lock position.
2. Disconnect the ITBM C1 harness connector.
3. Check connectors - Clean/repair as necessary.
4. Ignition on, engine not running.
5. Using a 12-volt test light connected to ground, check the (F944) Ignition Run/Start Control Output circuit.
  NOTE:
  Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (F944) Ignition Run/Start Control Output circuit for a short to ground, an open circuit, or high resistance.
  - Perform the ITBM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(A919) FUSED (B+) CIRCUIT OPEN OR HIGH RESISTANCE
1. Turn ignition off to the lock position.
2. Check connectors - Clean/repair as necessary.
3. Ignition on, engine not running.
4. Using a 12-volt test light connected to ground, check the (A919) Fused (B+) circuit.
  NOTE:
  Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5
  No
  - Repair the (A919) Fused (B+) circuit for a short to ground, an open circuit, or high resistance.
  - Perform the ITBM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(Z910) GROUND CIRCUITS OPEN OR HIGH RESISTANCE
1. Turn ignition off to the lock position.
2. Disconnect the ITBM C3 harness connector.
3. Using a 12-volt test light connected to B+, check the (Z910) Ground circuits.
  NOTE:
  Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go To 6
  No
  - Repair the (Z910) Ground circuit(s) for an open circuit or high resistance.
  - Perform the ITBM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
INTEGRATED TRAILER BRAKE MODULE (ITBM)
1. Turn ignition off to the lock position.
2. Disconnect the trailer.
3. 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. Pay particular attention to all Power and Ground circuits.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the ITBM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the Integrated Trailer Brake Module (ITBM) in accordance with Service Information. Refer to MODULE, INTEGRATED TRAILER BRAKE (ITBM), REMOVAL .
INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. 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.
3. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
4. Look for the data to change or for the DTC to reset during the wiggle test.
5. While monitoring the scan tool data relative to this circuit.
6. Connect the trailer to the vehicle.
7. Look for the data to change other than as expected or for the DTC to reset.
  Were any problems found?
  
  Yes
  - Repair as necessary. Possible trailer wiring problem, refer the customer to an authorized trailer dealer.
  - Perform the ITBM VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.