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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 85 (5.7L - DTCS P063A To P2127 - NGC - 3500 Cab & Chassis) >> Diagnosis and Testing >> P0703-Brake Switch 2 Performance >> Diagnostic Test

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.
  1. ACTIVE DTC 
    NOTE:

    Make sure the Stop Lamp Switch is adjusted properly before continuing.

    NOTE:

    Make sure the Stop Lamp Switch is properly wired, such as (B15) Brake Switch No. 1 and (L51) Brake Lamp Switch Output are not switched at the harness connector.

    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 

  2. (A108) FUSED IGNITION SWITCH OUTPUT CIRCUIT 
    Fig 1: Using 12-volt Test Light Connected To Ground To Probe (A108) Fused Ignition Switch Output Circuit In Stop Lamp Switch Harness Connector
    GC0090913Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Stop Lamp Switch harness connector.
    3. Using a 12-volt test light connected to ground, probe the (A108) Fused Ignition Switch Output circuit in the Stop Lamp Switch harness connector.
    4. Turn the ignition on.

      Does the test light illuminate brightly?

      Yes 

      • Go To  3.

      No 

      • Repair the open or short to ground in the (A108) Fused Ignition Switch Output circuit. Inspect the related fuse and repair as necessary.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  3. STOP LAMP SWITCH 
    1. Turn the ignition off.
    2. Measure the resistance between the (A108) Fused Ignition Switch circuit terminal and the (B16) Brake Switch No. 2 Signal terminal in the Stop Lamp Switch.
    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 Stop Lamp Switch while monitoring the Ohmmeter.

      Does the resistance change from below 5.0 Ohms to open circuit for each circuit check?

      Yes 

      • Go To  4.

      No 

  4. (B16) BRAKE SWITCH NO. 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 2: Measuring Voltage On (B16) Brake Switch No. 2 Signal Circuit In Stop Lamp Switch Harness Connector
    GC0090914Courtesy of CHRYSLER LLC
    1. Disconnect the C3 PCM harness connector.
    2. Ignition on, engine not running.
    3. Measure the voltage on the (B16) Brake Switch No. 2 Signal circuit in the Stop Lamp Switch harness connector.

      Is there any voltage present?

      Yes 

      • Repair the short to voltage in the (B16) Brake Switch No. 2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5.
  5. (B16) BRAKE SWITCH NO. 2 SIGNAL CIRCUIT OPEN 
    Fig 3: Measuring Resistance Of Brake Switch No. 2 Signal Circuit From Stop Lamp Switch Harness Connector To Appropriate Terminal Of PCM Pinout Box 8815
    GC0090874Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
      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 (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 .
  6. (B16) BRAKE SWITCH NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 4: Measuring Resistance Between Ground And (B16) Brake Switch No. 2 Signal Circuit In Stop Lamp Switch Harness Connector
    GC0090875Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and the (B16) Brake Switch No. 2 Signal circuit in the Stop Lamp Switch harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Repair the short to ground in the (B16) Brake Switch No. 2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7.
  7. (B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT OPEN 
    Fig 5: Measuring Resistance Of (B15) Brake Switch No. 1 Signal Circuit From Stop Lamp Switch Harness Connector To Appropriate Terminal Of PCM Pinout Box 8815
    GC0090877Courtesy of CHRYSLER LLC
    1. 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  8.

      No 

      • Repair the open in the (B15) Brake Switch No. 1 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. 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 

      No 

      • Replace and program the Powertrain Control Module in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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