1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4FACTORY OEM SERVICE PROCEDURE

Electrical Component Locator: Miscellaneous

MISCELLANEOUS

Component Component Location
A/C Compressor Clutch Diode Left side of engine compartment, taped in harness.
Automatic Lamp Control Diode On front impact bar.
Blower Motor Resistor Right rear of engine compartment.
Data Link Connector (DLC) (2.4L VIN T) On left side of dash, below steering column. See Figure .
Data Link Connector (DLC) (3.1L VIN M) On left side of dash, below steering column. See Figure .
Photo Resistor Top center of dash.
Program Connector Left front of luggage compartment.
SIR Coil Assembly Below steering column.
SIR Driver Safing Connector Left side lower dash.
SIR Passenger Safing Connector Right side of dash.
Factory Service Tools

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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.

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