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.

VERIFY DTC IS ACTIVE
NOTE:
Diagnose and repair all Pressure Sensor and Voltage related DTC's and all Stop Lamp related DTC's and symptoms before diagnosing this DTC.
1. Ignition on, engine not running.
2. With the scan tool, read DTC's.
3. With the scan tool, read and record Environmental Data (EV Data).
4. With the scan tool, erase DTC's.
5. Cycle the ignition switch.
  WARNING:
  Make sure brake capability is available before road testing.
6. Test drive the vehicle as follows: Drive for more than six minutes at a speed greater than 40 km/h (25 mph) and accelerate to a speed greater than 40 km/h (25 mph) and then decelerate to a speed lower than 3 km/h (2 mph) five consecutive times.
7. Park the vehicle.
8. With the scan tool, read DTC's.
  Is the DTC active?
  
  Yes
  - Go To 2.
  No
  - Perform the ABS INTERMITTENT CONDITION. Refer to ABS INTERMITTENT CONDITION .
INSPECT RELATED WIRING HARNESS, TERMINALS, AND CONNECTORS
1. Turn ignition off to the lock position.
2. Visually inspect the related wiring harness. Look for any pinched, chafed, pierced, and partially broken wires.
3. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, and corroded terminals.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 3.
CHECK (B15) BRAKE SIGNAL 1 CIRCUIT FUNCTION WHILE PRESSING AND RELEASING THE BRAKE PEDAL

Fig 1: Checking Brake Signal 1 Circuit Function While Pressing And Releasing The Brake Pedal
Courtesy of CHRYSLER GROUP, LLC
1. Ignition on, engine not running.
2. Using a 12-volt test light connected to 12 volts, backprobe the (B15) Brake Switch No. 1 Signal circuit at the PCM C3 harness connector.
3. Press and release the brake pedal.
  Does the test light illumination toggle from off to on?
  
  Yes
  - Go To 7.
  No
  - Go To 4.
CHECK (B15) BRAKE SIGNAL 1 CIRCUIT FOR A SHORT TO GROUND

Fig 2: Checking Brake Signal 1 Circuit For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn ignition off to the lock position.
2. Disconnect the PCM C3 harness connector.
3. Disconnect the Stop Lamp Switch harness connector.
4. Measure the resistance of the (B15) Brake Signal 1 circuit between ground and the PCM C3 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (B15) Brake Signal 1 circuit for a short to ground.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 5.
CHECK (B15) BRAKE SIGNAL 1 CIRCUIT FOR AN OPEN

Fig 3: Checking Brake Signal 1 Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (B15) Brake Signal 1 circuit between the ABS Module harness connector and the Stop Lamp Switch harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the (B15) Brake Signal 1 circuit for an open.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
CHECK (Z910) GROUND CIRCUIT FOR A OPEN

Fig 4: Checking Ground Circuit For A Open
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance on the (Z910) Ground circuit and ground in the Stop Lamp Switch harness connector.
  Is the resistance below 5 Ohms?
  
  Yes
  - Replace the Stop Lamp Switch in accordance with the Service Information.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Repair the open in the (Z910) Ground circuit.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
CHECK BRAKE PEDAL ADJUSTMENT

Fig 5: Checking Brake Switch No. 1 Signal Circuit In The Stop Lamp Switch Harness Connector
Courtesy of CHRYSLER GROUP, LLC
1. Connect the Stop Lamp Switch harness connector.
2. Using a 12-volt test light connected to 12 volts, backprobe the (B15) Brake Switch No. 1 Signal circuit in the Stop Lamp Switch harness connector.
3. Ignition on, engine not running.
4. Press and release the brake pedal.
  Does the test light illumination toggle from off to on within 4-5 mm of brake pedal travel?
  
  Yes
  - Replace the Antilock Bakes System (ABS) Module in accordance with the Service Information.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Replace the Stop Lamp Switch in accordance with the Service Information.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .