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.
2021 Land Rover Defender 110FACTORY OEM SERVICE PROCEDURE
TELEMATIC Control Unit Module (TCU): Notes
WARNING:
- A risk assessment must be performed before any work is undertaken. Failure to comply with this instruction may result in personal injury or death.
- All electric vehicle work must be performed by a suitably qualified person. Failure to comply with this instruction may result in personal injury or death.
- Appropriate Personal Protection Equipment must be worn when working on or near an electric vehicle high voltage system. Failure to comply with this instruction may result in personal injury or death.
- The hybrid/Electric Vehicle battery pack casing must not be disassembled due to the risk of exposure to hazardous voltage. Failure to comply with this instruction may result in personal injury or death.
- The electric power inverter converter casing must not be disassembled due to the risk of exposure to hazardous voltage. Failure to comply with this instruction may result in personal injury or death.
- If the hybrid/Electric Vehicle battery pack is damaged or overcharged, there is a risk of exposure to hazardous voltage and/or highly corrosive electrolyte mist. If liquid or vapor is observed leaking from the hybrid/Electric Vehicle battery pack, take the following action:
- Evacuate the area.
- Notify manager.
- Do not breathe smoke/vapor.
- Contain spillage using spill kit.
- Wash any spillage off body and clothing (remove contaminated clothing).
- If the electric vehicle warning indicator is illuminated, the battery energy control module cannot isolate the high voltage cables. Be aware that live working will be necessary to rectify the fault. Failure to comply with this instruction may result in personal injury or death.
- Be aware that a motor generator can generate a voltage if the wheels are rotated, even if the electric vehicle system has been made safe. Failure to comply with this instruction may result in personal injury or death.
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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