Diagnostic Test

READ AND RECORD DTCS AND ENVIRONMENTAL DATA
NOTE:
CLEARING THE DTC AFTER MAKING A REPAIR - Perform after wiring repair or module replacement:

Before the DTC can be erased from the Body Control Module (BCM), the BCM must detect an ignition ON/OFF/ON cycle, making sure the Power Accessory Delay (PAD) is deactivated after the ignition transitions to OFF, along with the normal operation of the system associated with this DTC.
1. Turn the ignition on.
2. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
3. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
4. With the scan tool, read Body Control Module (BCM) DTCs.
Is the DTC Active?

Yes
- If there are previous complaints of the Stop Lamps always on, or the Speed Control will not activate, Go To 2
No
- If the Stop Lamps and Speed Control system operate correctly, perform the appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK FOR STOP LAMP SENSOR RELATED DTC(S) PRESENT IN THE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE
1. Turn the ignition on.
2. With the scan tool, read ABS Module DTCs and record on the repair order.
  Are there any Stop Lamp Sensor related DTCs present?
  
  Yes
  - Repair the ABS Module DTCs before continuing with this test. Refer to DTC INDEX (1 OF 2) and/or DTC INDEX (2 OF 2) .
  No
  - Go To 3
CHECK FOR AN IMPROPERLY INSTALLED STOP LAMP SENSOR
1. Turn the ignition off.
2. Check the Stop Lamp Sensor for proper installation, damage, or mechanical failure in accordance with the Service Information.
  Were any problems found?
  
  Yes
  - Repair as necessary and perform the "Brake Pedal Sensor Calibration" routine.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
COMPARE THE BRAKE PEDAL TRAVEL SENSOR SETPOINT TO THE BRAKE PEDAL POSITION
NOTE:
The voltage of the Brake Pedal Travel Sensor Setpoint and Brake Pedal Position should be equal.
1. Start the engine.
2. With the scan tool, in ABS Data, compare the Brake Pedal Travel Sensor Setpoint voltage to the Brake Pedal Position voltage.
  Is the voltage difference between the ABS Data greater than 0.2 volts?
  
  Yes
  - Perform the "Brake Pedal Sensor Calibration" routine.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Stop Lamp Sensor in accordance with the Service Information. Refer to SENSOR, STOP LAMP, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .