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:
This DTC must be active for the results of this test to be valid.
1. Turn the ignition on.
2. With the scan tool, read and record the DTCs.
3. With the scan tool, read and record the Environmental Data to help identify the conditions in which the DTC was set.
4. With the scan tool, erase the DTCs.
5. Start the engine.
6. Press and release the brake pedal.
7. With the scan tool, read and record the DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go To 2
  No
  - Perform the ABS-INTERMITTENT CONDITION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (B15) BRAKE SIGNAL 1 FOR A SHORT TO VOLTAGE
1. Ignition off.
2. Disconnect the Body Control Module (BCM) C4 harness connector.
3. Disconnect the Anti-lock Brake System (ABS) Module harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (B15) Brake Signal 1 circuit in the ABS Module harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (B15) Brake Signal circuit for a short to voltage.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
CHECK THE (B15) BRAKE SIGNAL 1 FOR A SHORT TO GROUND
1. Ignition off.
2. Measure the resistance between ground and the (B15) Brake Signal 1 in the ABS Module harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go To 4
  No
  - Repair the (B15) Brake Signal 1 circuit for a short to ground.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (B15) BRAKE SIGNAL FOR AN OPEN OR HIGH RESISTANCE
1. Using a 12 volt test light connected to 12 volts, check the (B15) Brake Signal 1 circuit in the ABS Module harness connector.
  NOTE:
  The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
  
  Is the test light illuminated and bright?
  
  Yes
  - Replace the Anti-Lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the (B15) Brake Signal 1 circuit for an open circuit or high resistance.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .