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.
1993 Land Rover Defender 110FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS
| Component | Component Location |
|---|---|
| A/C Diode Pack (Z101) | Right Side, Behind Footwell Trim Panel. See Figure . |
| A/C Thermostat Unit (Z102) | Behind Passenger's Side Of Dash. See Figure . |
| ABS Booster Unit (Z103) | Driver's Rear Corner Of Engine Compartment. See Figure . |
| ABS Pressure Switch Unit (Z104) | Driver's Side Of Engine Compartment. See Figure . |
| ABS ECU (Z108) | Beneath Left Front Seat. See Figure . |
| Air Suspension ECU (Z165) | Beneath Right Front Seat. See Figure . |
| Audible Warning Unit (Z109) | Left Side, Above Lower Dash Panel. See Figure . |
| Blower Resistor Unit (Z112) | Inside Heater Unit, Beneath Center Of Dash. See Figure . |
| Central Locking Control Unit (Z113) | Near Steering Column, Above Lower Dash Panel. See Figure . |
| Cruise Control ECU (Z121) | Near Steering Column, Above Lower Dash Panel. See Figure . |
| Daytime Running Lights Control Unit (Z122) | Left Side, Behind Footwell Trim. See Figure . |
| Dim Dip Control Unit (Z124) | Right Side, Above Lower Dash Panel. See Figure . |
| Emissions Maintenance Reminder Unit (Z126) | Beneath Right Front Seat. See Figure . |
| Engine Control Module (ECM) (Z132) | Beneath Right Front Seat. See Figure . |
| Engine Oil Level Monitor Unit (Z127) | Behind Left Side Of Dash Above Lower Dash Panel. See Figure . |
| Fan Control Module (Z118) | Beneath Right Front Seat. See Figure . |
| Flasher Unit (Z128) | Driver's Side, Above Lower Dash Panel. See Figure . |
| Front Wipe Delay Unit (Z131) | Near Steering Column, Above Lower Dash Panel. See Figure . |
| Fuel Injection Fault Display Unit (Z133) | Beneath Right Front Seat. See Figure . |
| Fuel Tank Unit (Z134) | Inside Top Of Fuel Tank. See Figure . |
| Headlight Wash Timer Unit (Z136) | Passenger's Rear Corner Of Engine Compartment. See Figure . |
| Heated Front Window Timer Unit (Z137) | Right Side, Behind Footwell Trim Panel. See Figure . |
| Ignition Control Module (Z139) | Front Center Of Engine, Attached To Distributor. See Figure . |
| Interior Lights Delay Unit (Z144) | Near Steering Column, Above Lower Dash Panel. See Figure . |
| Left Headlight Level Unit (Z145) | Behind Left Headlight. |
| Memory Seat ECU (Z146) | Underside Of Driver's Seat. See Figure . |
| Power Window ECU (Z147) | In Center Console, Beneath Cubby Box Liner. See Figure . |
| Rear Wiper Delay Unit (Z154) | Near Steering Column Above Lower Dash Panel. See Figure . |
| Right Headlight Level Unit (Z155) | Behind Right Headlight. |
| Seatbelt & Speed Warning Unit (Z156) | Left Side, Above Lower Dash Panel. See Figure . |
| Speed Trip Module (Z164) | Right Side, Behind Footwell Trim Panel. See Figure . |
| Sunroof Control Unit (Z162) | Front Center Of Roof. See Figure . |
| Theft Alarm Unit (Z163) | Behind Driver's Side Of Dash. See Figure . |
| Warning Lamps Check Unit (Z161) | Left Side, Above Lower Dash Panel. See Figure . |
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.