Safety Warning
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 MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 820 (THEFT DETERRENT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DATA LIST
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Scan Tool Data List
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Scan Tool Data List
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Body Control Module (BCM) Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Doors, Hatch/Trunk and Hood CLOSED/No Switches Pressed/Vehicle in PARK or NEUTRAL | |||
| Backup Light Request | Input Data 1 | Active/Inactive | Inactive |
| Driver Door Ajar Switch | Input Data 2 | Open/Closed | Closed |
| Folding Top Ajar Switch (Convertible) | Input Data 2 | Active/Inactive | Inactive |
| Hatch/Trunk Ajar | Input Data 2 | Open/Closed | Closed |
| Hood Ajar (Export) | Input Data 2 | Open/Closed | Closed |
| Ignition 1 | Input Data 1 | On/Off | On |
| Key In Ignition | Input Data 1 | Active/Inactive | Active |
| Left Turn Signal Relay | Input Data 1 | Active/Inactive | Inactive |
| Passenger Door Ajar Switch | Input Data 2 | Open/Closed | Closed |
| PASS-Key® Resistor Signal | Data | 0-5.0 Volts | Varies |
| PASS-Key State | Input Data 1 | Monitor Key/Ignition Off | Monitor Key |
| Right Turn Signal Relay | Input Data 1 | Active/Inactive | Inactive |
| Theft Deterrent State | Input Data 1 | Active/Inactive/Fully Armed/Passive/Alarm | Inactive |
Driver Door Module (DDM) Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Doors, Hatch/Trunk and Hood CLOSED/No Switches Pressed/Vehicle in PARK or NEUTRAL | |||
| Door Key Unlock | Inputs | Active/Inactive | Inactive |
Passenger Door Module (PDM) Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Doors, Hatch/Trunk and Hood CLOSED/No Switches Pressed/Vehicle in PARK or NEUTRAL | |||
| Door Key Unlock | Inputs | Active/Inactive | Inactive |
Powertrain Control Module (PCM) Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Doors, Hatch/Trunk and Hood CLOSED/No Switches Pressed/Vehicle in PARK or NEUTRAL | |||
| PCM/VCM in VTD Fail Enable | Engine Data 3 | Yes/No | No |
| VTD Auto. Learn Timer | Engine Data 3 | Active/Inactive | Inactive |
| VTD Fuel Disable | Engine Data 3 | Active/Inactive | Inactive |
| VTD Fuel Disable Until Ign. Off | Engine Data 3 | Yes/No | No |
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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.