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.

NOTE:

The appropriate trailer or trailer simulator 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.

DTC IS ACTIVE
1. Connect the trailer or trailer simulator 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 status Active for this DTC?
  
  Yes
  - Go To 2.
  No
  - Go To 7.
TRAILER WIRING/BRAKES
1. Turn ignition off to the lock position.
2. Disconnect the trailer or trailer simulator 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.
(F943) IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE

Fig 1: Checking Ignition Run/Start Control Output Circuit Using 12-Volt Test Light Connected To Ground
Courtesy of CHRYSLER LLC
1. Turn ignition off to the lock position.
2. Disconnect the ITBM C2 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 (F943) 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 (F943) Ignition Run/Start Control Output circuit for a short to ground, an open circuit, or high resistance.
  - Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST and perform the ITBM VERIFICATION TEST.
(A115) FUSED (B+) CIRCUIT OPEN OR HIGH RESISTANCE

Fig 2: Checking Fused (B+) Circuit Using 12-Volt Test Light Connected To Ground
Courtesy of CHRYSLER LLC
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 (A115) 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 (A115) Fused (B+) circuit for a short to ground, an open circuit, or high resistance.
  - Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST and perform the ITBM VERIFICATION TEST.
(Z905) GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Fig 3: Checking Ground Circuit Using 12-Volt Test Light Connected To B+
Courtesy of CHRYSLER LLC
1. Turn ignition off to the lock position.
2. Using a 12-volt test light connected to B+, check the (Z905) Ground circuit.
  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 (Z905) Ground circuit(s) for an open circuit or high resistance.
  - Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST and perform the ITBM VERIFICATION TEST.
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.
  - Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST and perform the ITBM VERIFICATION TEST.
  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.
  - Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST and perform the ITBM VERIFICATION TEST.
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.