▸ TRADE SERVICE
Electrical diagnostics
when your scan tool runs out of road.
Spot-On dispatches advanced electrical diagnostics to repair shops across the San Antonio metro for the faults a general scan tool can't isolate — CAN bus communication failures, parasitic battery drains, complex multi-module issues, and the work the dealership has already said they "can't replicate." We bring OEM scan tools, engineering-tier software, signal analysis, and the patience to chase a fault until it's found.
▸ WHAT WE WORK ON
The faults that don't fit on a single screen.
- CAN bus & gateway communication failuresNetwork topology analysis, termination resistance verification, gateway routing diagnosis.
- Parasitic battery drainCurrent-draw isolation by circuit. Identifies the specific module or accessory drawing key-off current.
- Multi-module fault correlationsWhen fault codes across multiple modules trace to a single root cause — a failing bus terminator, a sleeping module that won't sleep, a corroded ground.
- Phantom faultsNo-code symptoms (HVAC behaving wrong, lighting glitches, accessory issues) tracked through actual signal analysis rather than guesswork.
▸ WHAT WE BRING
Tools that match the work.
- OEM scan tools per platformBMW ISTA, Mercedes XENTRY, VAG ODIS, Ford FDRS, GM GDS2/Tech 2, Toyota GTS+, Honda HDS, etc.
- Engineering softwareINPA, ISTA/P, ODIS-E, factory engineering modes — access the dealer's standard scan tools don't expose.
- Oscilloscope & signal analysisFor circuits and waveforms that need to be seen, not just queried over OBD.
- Data-logging hardwarePicoScope and OEM-software native logging for fault capture across drive cycles.
▸ READY TO DISPATCH
Request this service.
Call with the OEM, module, and fault codes. Same-day available for most platforms during business hours.