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 5.
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 "SB"?
  
  Yes
  - Go To 3.
  No
  - Trailer wiring/brakes are shorted to voltage, refer the customer to an authorized trailer dealer.
(B40) TRAILER TOW BRAKE (B+) CIRCUIT SHORTED TO VOLTAGE

Fig 1: Measuring Voltage Between Trailer Tow Brake (B+) Circuit & 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. Measure the voltage between the (B40) Trailer Tow Brake (B+) circuit and ground.
  Is there any voltage present?
  
  Yes
  - Repair the (B40) Trailer Tow Brake (B+) circuit for a short to voltage.
  - Refer to STANDARD PROCEDURE - ITBM VERIFICATION TEST and perform the ITBM VERIFICATION TEST.
  No
  - Go To 4.
INTEGRATED TRAILER BRAKE MODULE (ITBM)
1. 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.