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.

ACTIVE DTC
NOTE:
Make sure the Stop Lamp Switch is adjusted properly before continuing.
1. Ignition on, engine not running.
2. With the scan tool, select View DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
STOP LAMP SWITCH OPERATION
1. Turn the ignition off.
2. Disconnect the Stop Lamp Switch harness connector.
3. Measure the resistance between the (G210) Ground circuit terminal and the (B15) Brake Switch No. 1 Signal terminal in the Stop Lamp Switch.
4. Apply and release the brake pedal while monitoring the Ohmmeter.
  Does the resistance change from below 5.0 Ohms to open circuit when pressing and releasing the brake pedal switch?
  
  Yes
  - Go To 3.
  No
  - Replace the Stop Lamp Switch.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
STOP LAMP SWITCH OPERATION
1. Measure the resistance between the (A108) Fused Ignition Switch Output terminal and the (B16) Brake Switch No. 2 Signal circuit terminal in the Stop Lamp Switch.
2. Apply and release the brake pedal while monitoring the Ohmmeter.
  Does the resistance change from below 5.0 Ohms to open circuit when pressing and releasing the Stop Lamp switch?
  
  Yes
  - Go To 4.
  No
  - Verify that there is good pin to terminal contact in the Switch and Powertrain Control Module connectors. Replace the Stop Lamp Switch if no problems were found in the connectors.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT OPEN

Fig 1: Measuring Resistance Of (B15) Brake Switch No. 1 Signal Circuit From Stop Lamp Switch Harness Connector To Appropriate Terminal Of PCM Pinout Box 8815
Courtesy of CHRYSLER LLC
1. Disconnect the C3 PCM harness connector.
  CAUTION:
  Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis.
2. Measure the resistance of the (B15) Brake Switch No. 1 Signal circuit from the Stop Lamp Switch harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position).
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5.
  No
  - Repair the open in the (B15) Brake Switch No. 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(B16) BRAKE SWITCH NO. 2 SIGNAL CIRCUIT OPEN

Fig 2: Measuring Resistance Of Brake Switch No. 2 Signal Circuit From Stop Lamp Switch Harness Connector To Appropriate Terminal Of PCM Pinout Box 8815
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (B16) Brake Switch No. 2 Signal circuit from the Stop Lamp Switch harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position).
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the open in the (B16) Brake Switch No. 2 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Stop Lamp Switch and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Switch and Powertrain Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .