Tech 2 Data Definitions Part 2

The typical scan tool data definitions represent general information displayed on the scan tool regarding the following items:
- BCM functions
- Ignition inputs
- Basic operating conditions

Park Brake Switch

Range: SET/RELEASED
The park brake switch information refers to the position of the park brake pedal.

SET displays when you depress the parking brake (switch closed).

RELEASED displays when you do not depress the parking brake switch (switch opened).

The BCM uses the data in order to control the operation of the following items:
- The parking brake ON warning light feature
- The DRL system

RAP Relay Feedback

Range: ON/OFF
The RAP feedback information refers to the operation of the retained accessory power (RAP) circuit. ON displays whenever the BCM turns ON the RAP relay. The RAP relay then allows the following components to operate:
- The radio
- The power windows

Passenger Door Unlock Input

Range: ACTIVE/INACTIVE
The passenger door unlock input information refers to the operation of the following items:
- Passenger door(s) unlock function
- Passenger door unlock relay

ACTIVE displays whenever the passenger door unlock relay coil is energized. An energized coil allows current to flow to the lock/unlock motors.

INACTIVE displays whenever the passenger door unlock relay is not energized. This condition prevents current from reaching the lock/unlock motors.

Door Lock Relay Feedback

Range: ON/OFF
The door lock relay feedback information refers to the operation of the following items:
- Power door locks
- Power door lock relay

ON displays when the BCM senses the door lock relay coil is energized. This allows the current to flow to the lock/unlock motors.

OFF displays when the BCM does not sense that the door lock relay coil is being energized.

Horn Relay Input

Range: ACTIVE/INACTIVE
The horn relay input information refers to the horn operation.

ACTIVE displays when the following conditions exist:
- The BCM senses that the horn relay coil circuit is grounded.
- The horns receive a command to sound.

INACTIVE displays when the following conditions exist:
- The BCM does not sense that the horn relay coil circuit is grounded.
- The horns do not receive a command to sound.

lnput2

Interior Lamp Request

Range: ACTIVE/INACTIVE
The interior lamp request information refers to the interior lamp request circuit.

ACTIVE displays momentarily when the driver turns the interior lamp ON and the inadvertent power relay is ON.

INACTIVE displays when the inadvertent power relay is ON.

Headlamp Request Switch

Range: ACTIVE/INACTIVE
The BCM uses the headlamp request switch input in order to determine the position of the headlamp switch.

ACTIVE displays when the headlamp switch is in the HEADLAMP position.

INACTIVE displays when the headlamp switch is not in the HEADLAMP position.

Headlamp Relay Feedback

Range: ON/OFF
The BCM uses the headlamp Relay Feedback input in order to determine if the headlamps are ON or OFF by determining if current is present on the headlamp circuit. The BCM monitors CKT 352 in order to determine if the headlamp power relay energizes.

ON displays when the BCM receives a voltage input on the circuit between the headlamp switch and the headlamp power relay coil. The voltage input indicates that the headlamps are ON.

OFF displays when the BCM does not receive a voltage signal on the circuit between the headlamp switch and the headlamp power relay coil. The lack of voltage indicates that the headlamps are OFF.

High Beam Switch

Range: ON/OFF
The BCM uses the High beam switch input in order to determine if the High beam headlamps are ON by measuring the voltage on CKT 524 between the following components:
- Both of the High beam headlamps
- The high/low beam selector switch
- The flash to pass switch

Flash to Pass

Range: ON/OFF
The BCM monitors the flash to pass input on CKT 1356 in order to determine if the High beams are requested ON. The scan tool displays ON when the BCM or the flash to pass switch commands the High beams ON. OFF is displayed when the flash to pass switch or the BCM is not commanding the High beams ON.

Park Lamps

Range: ON/OFF
The BCM monitors the voltage on the park lamp CKT 2409 in order to determine if the park lamps are ON. The scan tool displays ON when the BCM or the headlamp switch turns the park lamps ON. OFF displays when the neither the park lamp switch nor the BCM commands the park lamps to turn ON.

Daytime Running Lamps

Range: ON/OFF
The BCM monitors the state of the daytime running lamps in order to determine if the daytime running lamps are ON.

The scan tool displays ACTIVE when the BCM commands the daytime running lamps to turn ON. INACTIVE displays when the BCM does not command the DRL to turn ON.

Left Turn Signal

Range: ON/OFF
The BCM uses the left turn signal input in order to determine the state of the left turn signal.

ON displays when the left turn signal switch engages. This commands the left turn signal lamps to illuminate.

OFF displays when the left turn signal switch does not engage or the turn signal lamps do not illuminate.

The BCM monitors the vehicle speed input for activation of the turn signal reminder chime feature. The scan tool display alternates between ON and OFF as the turn signal flashes.

Right Turn Signal

Range: ON/OFF
The BCM uses the right turn signal input in order to determine the state of the right turn signal.

ON displays when the right turn signal switch engages. This commands the right turn signal lamps to illuminate.

OFF displays when the right turn signal switch does not engage or the turn signal lamps do not illuminate. The BCM monitors the vehicle speed input for activation of the turn signal reminder chime feature. The scan tool display alternates between ON and OFF as the turn signal flashes.

Front Fog Lamp Switch

Range: ON/OFF
The BCM uses the front fog lamp switch input in order to determine the status of the front fog lamp switch.

ON displays when you depress the front fog lamp switch.

OFF displays when you are not depressing the front fog lamp switch.

Dome Lamp Switch

Range: ON/OFF

The BCM uses the dome lamp switch input in determining if the dome lamp switch (thumb wheel) is requesting the interior lights to turn ON.

ON displays if the dome lamp switch requests the BCM to turn the interior lights ON (full up position past the detent).

OFF displays when the dome lamp switch does not request the BCM to turn the interior lights ON (not in the full up position past the detent).

Dome Override Switch

Range: ON/OFF
The BCM uses the dome override switch input from the dome override switch in order to allow or to defeat the interior lighting when the door opens. The dome override switch is located near the headlamp switch.

ON displays if the dome override switch is overriding the interior lighting.

OFF displays if the dome override switch allows the interior lights to turn ON when any door opens or if the left glass opens (if equipped).

Dim Pot Input

Range: ACTIVE/INACTIVE
The BCM uses the dim pot input in order to determine the position of the dome lamp switch (thumb wheel) when the park lamps are ON.

ACTIVE displays when the dome lamp switch is not in the FULL DOWN position and the park lamps are ON.

INACTIVE displays when you turn the dome lamp switch to the FULL DOWN position (dash lights OFF) and the park lamps are ON.

The headlamp reminder chime does not sound under the following conditions:
- The dome lamp switch (thumbwheel) is in the FULL DOWN position (MAX DIM).
- You turn the park lamps ON manually.
- You remove the ignition key.

Courtesy Lamp Relay

Range: ON/OFF
The BCM uses the courtesy lamp relay input in order to determine the state of the courtesy lamp relay.

ON displays when the BCM commands the courtesy lamps to turn ON by providing a ground for the courtesy lamp relay coil.

OFF displays when the BCM is not commanding the courtesy lamps to turn ON by not providing a ground for the courtesy lamp relay coil.

Auto Headlamps Enable

Range: YES/NO

The output refers to the BCM commanded state of the auto headlamp feature.

YES displays when the BCM commands the auto headlamps to turn ON.

NO displays when the BCM commands the auto headlamps to turn OFF.

Auto Headlamps

Range: ACTIVE/INACTIVE

The BCM uses the auto headlamps input in order to determine if the auto headlamps are ON.

ACTIVE displays when the auto headlamps are ON.

INACTIVE displays when the auto headlamps are OFF.

Outputs

Chime

Range: NONE/HEADLAMP/KEY IN IGNITION/SEAT BELT/TURN SIGNAL

The chime output refers to the commanded state of the audible chime.

NONE displays when no audible chime sound is commanded.

HEADLAMP displays when the headlamp ON reminder feature commands the chime to turn ON.

KEY IN IGNITION displays when the key in ignition reminder feature and the driver door open feature command the chime to turn ON.

SEAT BELT displays when the driver seat belt not buckled reminder feature commands the chime to turn ON.

TURN SIGNAL displays when the turn signal ON reminder feature (on for more than 0.75 mile) commands the chime to turn ON.

Interior Lighting Mode
Range: NON E/INTERIOR/ILLUM ENTRY/EXIT LIGHTING/REMOTE ILLUM

The interior lighting mode output displays the name of the feature that is commanding the interior lights to turn ON.

NONE displays when the interior lights are not commanded to turn ON.

INTERIOR displays when the dome lamp switch commands the interior lights to turn ON.

ILLUM, ENTRY, EXIT LIGHTING, REMOTE ILLUM. display when the respective mode commands the interior lighting to turn ON.

Inadvertent Power Relay

Range: ON/OFF
The inadvertent power relay output refers to the commanded state of the inadvertent power relay coil.

ON displays when the BCM commands the inadvertent power relay coil to energize. The command allows the relay to power up the following components:
- The courtesy lamp relay
- The vanity lamps
- The underhood lamps
- The glove box lamp

OFF displays when the BCM does not command the inadvertent power relay coil to turn ON. The inadvertent power relay coil then does not allow current to the following components:
- The courtesy lamp relay
- The vanity lamps
- The underhood lamp
- The glove box lamp

RAP Relay

Range: ON/OFF
The RAP relay output refers to the commanded state of the RAP relay coil.

ON displays when the BCM commands the RAP relay coil to energize. The command allows the relay to power up the following components:
- The radio
- The power windows

OFF displays when the BCM commands the RAP relay to turn OFF.

Headlamp Power Relay

Range: ON/OFF
The headlamp power relay output refers to the commanded state of the headlamp power relay coil.

ON displays when the BCM commands the headlamp power relay coil to turn ON.

OFF displays when the BCM does not command the headlamp power relay coil to turn ON.

The BCM then does not allow current to the headlamp power relay coil. The headlamps remain OFF.

DRL Relay

Range: ON/OFF
The DRL relay output refers to the commanded state of the DRL relay coil.

ON displays when the BCM commands the DRL relay coil to turn ON. This allows the relay to power up the daytime running lamps.

OFF displays when the BCM does not command the DRL relay coil to turn ON. This denies current to the DRL relay coil and causes the daytime running lamps to be OFF.

Park Lamp Relay

Range: ON/OFF
The park lamp relay output refers to the commanded state of the park lamp relay coil.

ON displays when the BCM commands the park lamp relay coil to turn ON. This allows the relay to power up the park lamps.

OFF displays when the BCM does not command the park lamp relay coil to turn ON. This denies current to the park lamps and causes the park lamps to be OFF.

Front Fog Lamp Relay

Range: ON/OFF
The front fog lamp relay output refers to the commanded state of the front fog lamp relay coil.

ON displays when the BCM commands the front fog lamp relay coil to turn ON. This allows the relay to power up the front fog lamps

OFF displays when the BCM does not command the front fog lamp relay coil to turn ON. This denies current to the front fog lamps and causes the front fog lamps to remain OFF.

Courtesy Lamp Relay

Range: ON/OFF
The courtesy lamp relay output refers to the commanded state of the courtesy lamp relay coil.

ON displays when the BCM commands the courtesy lamp relay coil to turn ON. This allows the relay to power up the courtesy lamps, and causes the courtesy lamps to turn ON. OFF displays when the BCM does not command the courtesy lamp relay coil to turn ON. This causes the courtesy lamps to remain OFF.

Dimming

Range: ACTIVE/INACTIVE
The dimming output refers to the state of the headlamp switch dimming feature. The headlamp switch dimming feature is a term describing the customer's ability to control the illumination of the following components:
- The instrument panel cluster
- The radio
- The HVAC controls
- The PRNDL
- The PSIR switch with the dome lamp switch (thumbwheel) near the headlamp switch

The up and down movement of the dome lamp switch allows the customer the ability to control the brightness of the components.

INACTIVE displays when the park lamps are OFF. ACTIVE displays when the park lamps are ON.

Door Lock Relay

Range: ON/OFF
The door lock relay output refers to the commanded state of the door lock relay coil.

ON displays when the BCM commands the door lock relay coil to turn ON.

ON displays when you press the power lock button.

OFF displays when you do not press the power lock button.

Driver Door Unlock Relay

Range: ON/OFF
The driver door unlock relay output refers to the commanded state of the driver door unlock relay coil.

ON displays when the BCM commands the driver door unlock relay coil to turn ON.

ON momentarily displays when an input from the power door unlock switches. This causes the BCM to unlock the driver door.

OFF displays when the BCM does not command the driver door unlock relay coil to turn ON and the driver door unlock relay does not energize.

Passenger Door Unlock Relay

Range: ON/OFF

The passenger door unlock relay output refers to the command state of the passenger door unlock relay coil.

ON displays when the BCM commands the passenger door unlock relay coil to turn ON.OFF displays when you use the passenger power door unlock button.

Horn Relay

Range: ON/OFF

The horn relay output refers to the commanded state of the horn relay coil. The horn button and the RFA transmitter panic button are inputs to the BCM. The BCM supplies a ground to the horn relay coil and sounds the horns.

ON displays when the BCM commands the horn relay coil to turn ON when you perform the following steps:
1. Press the horn button.
2. Press the transmitter panic button.

OFF displays when the BCM does not command the horn relay coil to turn ON and neither the RFA transmitter panic button nor the horn button are pressed.

Security Data

Ignition I

Range: ACTIVE/INACTIVE
The BCM uses the Ignition I data in order to determine the position of the ignition switch. ACTIVE displays when the ignition switch is in the RUN or CRANK position.

INACTIVE displays when the ignition switch is not in the RUN or CRANK position.

Ignition 3

Range: ACTIVE/INACTIVE
The BCM uses the Ignition 3 data in order to determine the position of the ignition switch.
ACTIVE displays when the ignition switch is in the RUN position.
INACTIVE displays when the ignition switch is not in the RUN position.

Battery Voltage

Range: 0.0 - 16.0 volts
The voltage value that displays refers to the battery system voltage measured by the BCM on CKT 1140.

Content Theft Lamp

Range: ON/OFF/FLASHING
The security lamp turns ON for 15 seconds and then turns OFF when you open a door by using the handle or the key fob. The security lamp also displays ON STEADY for 3 seconds and then turns OFF when the ignition switch turns from the OFF position to the RUN position. The security telltale has the following 3 states:
- OFF
- ON STEADY
- FLASHING

If the IPC is unable to communicate with the BCM, the security telltale displays ON STEADY and the Passlock (TM) system functions. The security telltale goes to FLASHING mode momentarily and then displays ON STEADY for approximately 10 minutes if the vehicle is in the lockout cycle. The passlock (TM) system requires 3 consecutive lockout cycles in order to complete the 30 minute learn procedure for a changed component. Refer to Theft Deterrent on the theft deterrent system.
Antitheft and Alarm Systems