Diagnostic Test

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

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1. Turn the ignition off.
2. Disconnect the Stop Lamp Switch harness connector.
3. Using a 12 volt test light connected to 12 volts, check the (B15) Brake Signal 1 circuit at the Stop Lamp Switch harness connector 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

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1. Turn the ignition on.
2. Using a 12 volt test light connected to ground, check the (B16) Brake Signal 2 circuit at the Stop Lamp Switch harness connector 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

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1. 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 excessive resistance in the (Z912) Ground circuit.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
(B15) BRAKE SIGNAL 1 CIRCUIT SHORTED TO GROUND

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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 short to ground in the (B15) Brake Signal 1 circuit.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
(B15) BRAKE SIGNAL 1 CIRCUIT OPEN OR HIGH RESISTANCE

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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 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 excessive resistance in the (B15) Brake Signal 1 circuit.
  - 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

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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 open in the (F202) Fused Ignition Switch Output (Run-Start) circuit.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
(B16) BRAKE SIGNAL 2 CIRCUIT SHORTED TO VOLTAGE

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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 short to voltage in the (B16) Brake Signal 2 circuit.
  - 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

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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 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 excessive resistance in the (B16) Brake Signal 2 circuit.
  - 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