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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 644 (VEHICLE DIAGNOSTIC INFORMATION - SCAN TOOL INFORMATION)SPECIFICATIONSBODY CONTROL MODULE SCAN TOOL INFORMATION
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Body Control Module Scan Tool Information
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Body Control Module Scan Tool Information
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Instrument Panel Module Scan Tool Data Parameters
| Parameter | System State | Expected Value | Description |
|---|---|---|---|
| Operating Conditions: Ignition ON | |||
| Accessory LED Duty Cycle | - | Varies | This displays %. |
| Accessory Relay Status | - | Off | The scan tool displays On or Off. This is the state of the accessory relay. |
| Adjusted Battery Current | - | Varies | This displays amps. |
| Battery Voltage Signal | - | Varies | This displays Volts. This is the current battery voltage signal. |
| BPP Sensor | - | Varies | This displays Counts. This is the current brake pedal position (BPP) measured in counts. |
| BPP Sensor Reference | - | Varies | This displays Counts. This is the brake pedal position (BPP) sensor reference measured in counts. |
| BPPS High During Learn | - | No | The scan tool displays Yes or No. Yes is displayed if the brake pedal position sensor (BPPS) was high during learn. |
| BPPS Learned Home Position | - | Varies | This displays Volts. This is the brake pedal position sensor (BPPS) home position measured in volts. |
| BPPS Low During Learn | - | No | The scan tool displays Yes or No. Yes is displayed if the brake pedal position sensor (BPPS) was low during learn. |
| BPPS Move During Learn | - | No | The scan tool displays Yes or No. Yes is displayed if the brake pedal position sensor (BPPS) was moved during learn. |
| BPPS Status | - | Learned | The scan tool displays Learned, Unlearned, Undecided or Invalid. Learned is displayed if the brake pedal position sensor (BPPS) is calibrated properly. |
| Calculated Brake Pedal Position | - | Varies | This displays Counts. This is the current brake pedal position measured in counts. |
| Cigar Lighter Relay | - | Off | The scan tool displays On or Off. This is the state of the cigarette lighter relay. |
| Courtesy Lamp Switch | - | Off | The scan tool displays On or Off. This is the state of the courtesy lamp switch. |
| Column Lock Relay | - | Disabled | The scan tool displays Enabled or Disabled. This is the state of the column lock relay. |
| Cruise | - | Varies | This displays Counts. This is the state of the cruise switch measured in counts. |
| Dimming potentiometer | - | OK | The scan tool displays OK or Failed. |
| Dimming Required | - | No | The scan tool displays Yes or No. |
| Estimated Battery Temp. | - | Varies | This displays °C (°F). This is the current estimated battery temperature. |
| Flash to Pass Switch | - | Inactive / Off | The scan tool displays Active / Inactive or On / Off. This is the state of the flash to pass switch. |
| Front Foglamp Relay Status | - | Off | The scan tool displays On or Off. This is the state of the front foglamp relay. |
| Hazard Lamp Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the hazard lamp switch. |
| Hazard Lamps | - | Disabled | The scan tool displays Enabled or Disabled. This is the state of the hazard lamps. |
| Headlamp Switch | - | Off | The scan tool displays On or Off. This is the state of the headlamp switch. |
| Headlamp Washer Relay Status | - | Off | The scan tool displays On or Off. This is the state of the headlamp washer relay. |
| Headlamp Washer Switch | - | Off | The scan tool displays On or Off. This is the state of the headlamp washer switch. |
| Headlamp/Parklamp Off Switch | - | Off | The scan tool displays On or Off. This is the state of the headlamp / parklamp off switch. |
| High Beam Relay Status | - | Off | The scan tool displays On or Off. This is the state of the high beam relay. |
| High Beam Select Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the high beam select switch. |
| Horn Relay Status | - | Off | The scan tool displays On or Off. This is the state of the horn relay. |
| Ignition Mode Switch | - | Varies | This displays Volts. This is the current voltage at the ignition mode switch. |
| Incandescent Dimming | - | Varies | This displays %. This is the interior lighting dimming percentage. |
| Key Cylinder Halo Lamp | - | Varies | This displays %. This is the dimming percentage at the key cylinder. |
| Learn in Progress | - | No | The scan tool displays Yes or No. Yes is displayed if the brake pedal position sensor (BPPS) is in learn mode. |
| LED Dimming | - | Varies | This displays %. This is the backlighting dimming percentage. |
| Lights On With Wipers | - | Off | The scan tool displays On or Off. |
| Low Beam Relay Status | - | No | The scan tool displays Yes or No. This is the state of the low beam relay. |
| OFF LED Duty Cycle | - | Varies | This displays %. |
| Park Lamp Switch | - | Off | The scan tool displays On or Off. This is the state of the park lamp switch. |
| Park Position Input | - | In Park | The scan tool displays Out of Park or In Park. In Park is displayed if the vehicle transmission is in park. |
| Parkgear Home Position Switch | - | Varies | The scan tool displays On or Off. |
| Parking Brake Switch | - | Released | The scan tool displays Applied or Released. This is the state of the parking brake switch. |
| Parklamp Relay Status | - | Off | The scan tool displays On or Off. This is the state of the parklamp relay. |
| Personalization Status | - | Varies | The scan tool displays Driver 1, Driver 2 or Unknown. |
| Photocell State | - | Varies | The scan tool displays Day or Night. |
| PRNDL State | - | Park | The scan tool displays Park or Not in Park. Park is displayed if the transmission gear is in park. |
| Remote Start Attempts | - | Varies | The scan tool displays a numeric value from 0-10. |
| Remote Start Equipped | - | Varies | The scan tool displays Active or Inactive. |
| Remote Start Request | - | No | The scan tool displays Yes or No. |
| Remote Starts Remaining | - | Varies | The scan tool displays a numeric value from 0-10. |
| Run Relay Status | - | Off | The scan tool displays On or Off. This is the state of the run relay. |
| Run/Crank Relay Status | - | Off | The scan tool displays On or Off. This is the state of the run/crank relay. |
| SIR Lighting | - | Disabled | The scan tool displays Enabled or Disabled. This is the state of the SIR lighting. |
| Smart Beam Status | - | Enabled | The scan tool displays Enabled or Disabled. This is the state of the smart beam. |
| Start LED Duty Cycle | - | Varies | This displays %. |
| Steering Wheel Controls Return | - | Varies | This displays Counts. |
| Steering Wheel Position Sensor | - | Varies | This displays Counts. This is the position of the steering wheel measured in counts. |
| Stop Lamp Status | - | Off | The scan tool displays On or Off. This is the state of the stop lamps. |
| Stoplamp Relay | - | Released | The scan tool displays Applied or Released. This is the state of the stoplamp relay. |
| Tap Up/Down Enable | - | Disabled | The scan tool displays Enabled or Disabled. |
| Telescope Forward Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the telescope forward switch. |
| Telescope Rearward Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the telescope rearward switch. |
| Tilt Down Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the tilt down switch. |
| Tilt Up Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the tilt up switch. |
| Traction Control Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the traction control switch. |
| Twilight Enable | - | Varies | The scan tool displays Enabled or Disabled. |
| Valet Switch | - | Inactive | The scan tool displays Active or Inactive. This is the state of the valet switch. |
Instrument Panel Module Scan Tool Output Controls
| Output Control | Description |
|---|---|
| Accessory LED | This output control is used to command the Accessory LED ON or OFF. |
| Air Quality Sensitivity Level | This output control is used to control the air quality sensitivity level. |
| BPP Sensor Calibration | This output control is used to calibrate the brake pedal position (BPP) sensor. |
| Column Lock Relay Enable | This output control is used to command the column lock relay enable function. |
| Front Fog Lamps | This output control is used to command the front fog lamps ON or OFF. |
| Headlamp Washer | This output control is used to select a headlamp washer ON or OFF. |
| High Beams | This output control is used to command the front high beams ON or OFF. |
| Horn | This output control is used to command the horn ON or OFF. |
| Idle Boost Level 1 | This output control is used to increase percentage or amperage of the idle boost level 1. Boost increases engine speed in the event that there is a low battery condition. |
| Idle Boost Level 2 | This output control is used to increase percentage or amperage of the idle boost level 2. Boost increases engine speed in the event that there is a low battery condition. |
| Idle Boost Level 3 | This output control is used to increase percentage or amperage of the idle boost level 3. Boost increases engine speed in the event that there is a low battery condition. |
| Ignition Switch LED Power | This output control is used to command the Accessory, Off and Start LEDs around the start switch ON or OFF. |
| Incandescent Dimming | This output control is used to control the incandescent dimming from 0-100 percent by 20 percent increments when INCREASE or DECREASE is selected. |
| LED Dimming | This output control is used to control the LED dimming from 0-100 percent by 20 percent increments when INCREASE or DECREASE is selected. |
| Low Beams | This output control is used to command the low beam headlamps ON or OFF. |
| Off LED | This output control is used to command the Off LED ON or OFF. |
| Parking Lamps | This output control is used to command the parking lamps ON or OFF. |
| Program VIN | This output control is used to program the vehicle identification number (VIN) into the module. |
| Setup New IPM / RIM | This output control is used to setup the instrument panel module (IPM) or rear integration module (RIM). |
| Smart Beam | This output control is used to enable or disable the smart beam in the rear view mirror. |
| Start LED | This output control is used to command the Start LED ON or OFF. |
| Stop Lamp | This output control is used to command the stop lamps ON or OFF. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.