📍 Under center console or behind passenger kick panel
🔧 Drive cycle
⚠️ Only on models with A131L or A140E automatic transmission with ECT. Requires adaptive shift relearn through normal driving. Manual transmissions have no TCM.
Supplemental Restraint System Control Module (SRS ECU)1.0 hr R&Rno coding
📍 Under center console, between front seats
⚠️ Introduced 1991-1992 model years on select trims. Driver airbag only. Disconnect battery and wait 90 seconds before removal. Plug-and-play replacement.
Engine Control Unit (ECU)1.0 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Under passenger seat or behind glove box
🔧 Toyota Hand-Held Tester or drive cycle
⚠️ All fuel-injected models (4A-FE, 4A-GE, 4A-LC). Requires idle relearn and drive cycle after replacement. Blink code diagnostics via check engine light.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 1989 Toyota Corolla 1.6L I4 4WD and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.