Diagnostic Test

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, monitor the Brake Signal 1 and Brake Signal 2 states while pressing and releasing the brake pedal several times.
  Do the Brake Signal states change appropriately as the pedal is pressed and released?
  
  Yes
  - Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 2
(B15) BRAKE SIGNAL 1 CIRCUIT

Fig 1: CHECKING BRAKE SIGNAL 1 CIRCUIT
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Powertrain Control Module (PCM) 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 Miller Special Tool #8815 to perform diagnosis.
3. Using a 12 volt test light connected to 12 volts, check the (B15) Brake Signal 1 circuit at the appropriate terminal of special tool #8815 while pressing and releasing the brake pedal several times.
  Does the test light change from illuminated to not illuminated as the brake pedal is pressed and released?
  
  Yes
  - Go to step 3.
  No
  - Go to step 4
(B16) BRAKE SIGNAL 2 CIRCUIT

Fig 2: CHECKING BRAKE SIGNAL 2 CIRCUIT
Courtesy of CHRYSLER LLC
1. Turn the ignition on.
  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 Miller Special Tool #8815 to perform diagnosis.
2. Using a 12 volt test light connected to ground, check the (B16) Brake Signal 2 circuit at the appropriate terminal of special tool #8815 while pressing and releasing the brake pedal several times.
  Does the test light change from illuminated to not illuminated as the brake pedal is pressed and released?
  
  Yes
  - Go to step 11
  No
  - Go to step 7
(Z912) GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Fig 3: CHECKING GROUND CIRCUIT FOR OPEN OR HIGH RESISTANCE
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Stop Lamp Switch connector.
3. Using a 12 volt test light connected to 12 volts, check the (Z912) Ground circuit in the Stop Lamp Switch harness connector.
  NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
  
  Is the test light illuminated and bright?
  
  Yes
  - Go to step 5
  No
  - Repair the (Z912) Ground circuit for an open circuit or high resistance.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(B15) BRAKE SIGNAL 1 CIRCUIT SHORTED TO GROUND

Fig 4: CHECKING BRAKE SIGNAL 1 CIRCUIT FOR SHORT TO GROUND
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (B15) Brake Signal 1 circuit in the Stop Lamp Switch harness connector.
  Is the resistance above 100 ohms?
  
  Yes
  - Go to step 6
  No
  - Repair the (B15) Brake Signal 1 circuit for a short to ground.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(B15) BRAKE SIGNAL 1 CIRCUIT OPEN OR HIGH RESISTANCE

Fig 5: CHECKING BRAKE SIGNAL 1 CIRCUIT FOR OPEN OR HIGH RESISTANCE
Courtesy of CHRYSLER LLC

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 Miller Special Tool #8815 to perform diagnosis.
1. Measure the resistance of the (B15) Brake Signal 1 circuit between the Stop Lamp Switch harness connector and the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 10
  No
  - Repair the (B15) Brake Signal 1 circuit for an open circuit or high resistance.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(F202) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT OPEN OR HIGH RESISTANCE

Fig 6: CHECKING FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR OPEN OR HIGH RESISTANCE
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Stop Lamp Switch connector.
3. Turn the ignition on.
4. Using a 12 volt test light connected to ground, check the (F202) Fused Ignition Switch Output (Run-Start) circuit in the Stop Lamp Switch harness connector.
  NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
  
  Is the test light illuminated and bright?
  
  Yes
  - Go to step 8
  No
  - Repair the (F202) Fused Ignition Switch Output (Run-Start) circuit for an open circuit or high resistance.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(B16) BRAKE SIGNAL 2 CIRCUIT SHORTED TO VOLTAGE

Fig 7: Measuring Voltage Of Brake Signal 2 Circuit In Stop Lamp Switch Harness Connector
Courtesy of CHRYSLER LLC
1. Measure the voltage of the (B16) Brake Signal 2 circuit in the Stop Lamp Switch harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (B16) Brake Signal 2 circuit for a short to voltage.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 9
(B16) BRAKE SIGNAL 2 CIRCUIT OPEN OR HIGH RESISTANCE

Fig 8: CHECKING BRAKE SIGNAL 2 CIRCUIT FOR OPEN OR HIGH RESISTANCE
Courtesy 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 Miller Special Tool #8815 to perform diagnosis.
2. Measure the resistance of the (B16) Brake Signal 2 circuit between the Stop Lamp Switch harness connector and the appropriate terminal of special tool #8815.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 10
  No
  - Repair the (B16) Brake Signal 2 circuit for an open circuit or high resistance.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
STOP LAMP SWITCH
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.
4. Refer to any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace the Stop Lamp Switch in accordance with the Service Information.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
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.
4. Refer to any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
  - Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .