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.
1989 Mazda 626 BaseFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Anti-Lock Brake Control Unit | Under right side of driver's seat. |
| Automatic Adjusting Suspension (AAS) Control Unit | Under right side of passenger's seat. |
| Automatic Seat Belt Control Unit | Under left side of passenger's seat. |
| Central Processing Unit | In joint/fuse box. |
| Cruise Control Unit | Under dash, near steering column. See Figure . |
| Electronic Transaxle Control Unit | Near joint/fuse box. See Figure & Figure . |
| Electrical Load Control Unit | Under center of dash, near ECU. See Figure & Figure . |
| Engine Control Unit (ECU) | Under center of dash. See Figure & Figure . |
| Fuel Pump Control Unit | In right rear corner of trunk. See Figure . |
| Knock Control Unit | On right side of firewall. See Figure & Figure . |
| Four Wheel Steering (4WS) Control Unit | Under left side of driver's seat. |
| Power Steering Control Unit | Under left side of driver's seat. |
Factory Service Tools
Use the Manual With the Right Hardware
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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.