Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
Diagnose and repair all PCM and any communication faults that are present before continuing with this test procedure.

NOTE:
If applicable make sure the Stop Lamp Switch is properly adjusted in accordance with Service Information before continuing.
1. Ignition on, engine not running.
2. With a scan tool, record and erase the DTC's.
3. Cycle the ignition from off to on.
4. Press the brake pedal.
5. With a scan tool, read the DTC's.
  Is the DTC Active at this time?
  
  Yes
  - Go To 2.
  No
  - Perform the ABS INTERMITTENT CONDITION diagnostic procedure. Refer to ABS INTERMITTENT CONDITION .
(B15) BRAKE SIGNAL 1 CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Checking Brake Signal Circuit For A Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Ignition on, engine not running.
2. Using a 12-volt test light connected to ground, back probe the (B15) Brake Signal 1 circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3.
  No
  - Perform the ABS INTERMITTENT CONDITION diagnostic procedure. Refer to ABS INTERMITTENT CONDITION .
STOP LAMP BRAKE PEDAL SWITCH SHORTED

Fig 2: Checking Stop Lamp Brake Pedal Switch For A Short
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off to the lock position.
2. Disconnect the Stop Lamp Switch harness connector.
3. Measure the resistance of the Stop Lamp Switch between (B15) Brake Signal 1 circuit and (A108) Fused B(+) circuit at the Stop Lamp Switch harness connector.
  Is there continuity?
  
  Yes
  - Replace the Stop Lamp Switch in accordance with the Service Information
  - Go To 4.
  No
  - Go To 5.
CHECK (B15) BRAKE SIGNAL 1 CIRCUIT FOR A SHORT TO VOLTAGE

Fig 3: Checking Brake Signal Circuit For A Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Connect the Stop Lamp Switch harness connector.
2. Ignition on, engine not running.
3. Using a 12-volt test light connected to ground, back probe the (B15) Brake Signal 1 circuit at the Stop Lamp Switch harness connector.
  Does the test light illuminate?
  
  Yes
  - Go To 5.
  No
  - Repair the short to voltage in the (B15) Brake Signal 1 circuit.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
CHECK ABS MODULE BACKFEEDING VOLTAGE TO (B15) BRAKE SIGNAL 1 CIRCUIT

Fig 4: Checking ABS Module Backfeeding Voltage To Brake Signal 1 Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Turn ignition off to the lock position.
2. Disconnect the ABS Module harness connector.
3. Ignition on, engine not running.
4. Using a 12-volt test light connected to ground, test the (B15) Brake Signal 1 circuit at the Stop Lamp Switch harness connector.
  Does the test light illuminate?
  
  Yes
  - Go To 6.
  No
  - Replace the Antilock Brake System (ABS) Module in accordance with Service Information
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
CHECK TIPM MODULE BACKFEEDING VOLTAGE TO (B15) BRAKE SIGNAL 1 CIRCUIT

Fig 5: Checking ABS Module Backfeeding Voltage To Brake Signal 1 Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the TIPM harness connector.
3. Ignition on, engine not running.
4. Using a 12-volt test light connected to ground, test the (B15) Brake Signal 1 circuit.
  Does the test light illuminate?
  
  Yes
  - Repair the short to voltage in the (B15) Brake Signal 1 circuit.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Replace and program the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .