Fitment notes: Compact group size typical for Japanese vehicles of this era
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Every control module on the 1989-1994 Nissan 240SX — where it lives, replacement time, and what it takes to program a replacement.
Air Conditioning Amplifier (A/C Amplifier)2.0 hr R&Rno coding
📍 Behind center dash HVAC controls
⚠️ Manual climate control only; controls A/C compressor clutch and blower speeds
Anti-Lock Brake System Control Unit (ABS Control Unit)1.8 hr R&Rno coding
📍 Engine bay, driver side near brake master cylinder
⚠️ Optional equipment; not available 1989-1990, available 1991-1994 on SE models; integrated with hydraulic unit
Combination Meter (Combination Meter)1.5 hr R&Rno coding
📍 Instrument panel behind gauge cluster
⚠️ Analog gauges with electronic speedometer; odometer is mechanical; no programming required
Automatic Transmission Control Module (ATCM)1.5 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Under driver's seat or behind center console
🔧 Drive cycle adaptation
⚠️ Only on automatic transmission models (4-speed RE4R01A); manual transmission models have no TCM
Engine Control Module (ECM)1.2 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Passenger side kick panel, behind trim cover
🔧 Consult-I or idle relearn procedure
⚠️ KA24E (1989-1990) and KA24DE (1991-1994) use different ECMs; idle relearn required after installation; ROM chip replaceable for tuning
Supplemental Restraint System Control Unit (SRS Control Unit)1.0 hr R&Rno coding
📍 Under center console between front seats
⚠️ Driver airbag only; introduced 1990 model year; disconnect battery and wait 10 minutes before service
Audio Control Unit (Radio/Audio Unit)0.5 hr R&Rno coding
📍 Center dash radio cavity
⚠️ AM/FM cassette standard; requires radio removal tool or DIN keys
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 Nissan 240SX 2.4L I4 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.