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.
1990 Mazda 323 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| Central Processing Unit (CPU) | Behind junction box, near left kick panel. See Figure . |
| Cruise Control Unit | Behind right kick panel. See Figure . |
| Daytime Running Light (DRL) Control Unit (Canada) | Below cruise control unit on right kick panel. See Figure & Figure . |
| Engine Control Unit (ECU) | Behind center of dash. See Figure . |
| Electronic Controlled Auto. Trans. (ECAT) Control Unit | Under far left dash, mounted vertically above relay bracket. |
| 4WD Control Unit | Under driver's seat. |
| Intermittent Wiper Unit | Mounted inside steering column. |
| Passive Shoulder Belt Control Unit | Under 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.
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