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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 670 ((Antilock Brake System (Abs) - Electrical Diagnostics - 2500 Hd & 3500 Hd)) >> Diagnosis And Testing >> B1783-01-Stop Lamp Control - General Electrical Failure >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    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?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (B15) BRAKE SIGNAL 1 FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Body Control Module (BCM) C4 harness connector.
    3. Disconnect the Anti-lock Brake System (ABS) Module harness connector.
    4. Turn the 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
  3. CHECK THE (B15) BRAKE SIGNAL 1 FOR A SHORT TO GROUND 
    1. Turn the 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 .
  4. CHECK THE (B15) BRAKE SIGNAL FOR AN OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (B15) Brake Signal 1 circuit in the BCM harness connector and the ABS Module harness connector.

      Is the resistance below 5 Ohms?

      Yes 

      No 

      • Repair the (B15) Brake Signal 1 circuit for an open circuit or high resistance.
      • Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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