Precautions when working with electrical equipment (Range Rover 3)

General remarks

The following instructions ensure safe working conditions and the safety of the vehicle's electrical and electronic equipment. Additional instructions relating to individual types of work are provided in the relevant sections of the Manual.

Equipment and devices

Before diagnosing vehicle systems, make sure that the diagnostic equipment is in good condition, the connecting wires and tips are not damaged. Be sure to check the condition of the wires and tips of the device's power supply circuit.

Maintaining polarity

Connect the battery to the vehicle circuit correctly, and observe the correct polarity when connecting diagnostic equipment.

High voltage circuits

When disconnecting high-voltage wires that are under voltage, use pliers with insulated handles. Do not allow high-voltage wires to come into contact with other electrical components, especially the electronic control unit. Be careful when measuring voltage at the ignition coil terminals with the engine running.; in this case, high-voltage interference is possible.

WARNING: - VEHICLES EQUIPPED WITH DUAL XENON HEADLIGHTS: - When handling them, the following instructions must be followed. Failure to follow the instructions may result in exposure to harmful ultraviolet rays, injury from high voltage, burns or explosion.

• All work should be carried out wearing special glasses and protective gloves.
• Before removing the bulbs, make sure the headlights are off.
• Do not touch the glass part of the lamp with your hands.
• Under no circumstances should the headlights be turned on with the bulbs removed.
• Checking the lamps can only be done after installing the lamp in the headlight socket.
• Used lamps must be disposed of in accordance with local regulations.

Connectors and Wiring Harnesses

The engine compartment space is an environment that is particularly unfavorable for the placement of electrical system components and connectors:

• Before disconnecting or connecting diagnostic equipment, make sure that the surface of electrical system components is dry and free of oil leaks.
• The disconnected connectors must not show signs of damage from oil, coolant or other liquids. Such damage may adversely affect the operation of the systems or cause a sudden failure.
• Never disassemble electrical connectors by applying significant mechanical force, such as using a screwdriver as a lever or pulling on a harness.
• Before disassembling the connector, return the connector lock to the disassembled position.; before assembling the connector, make sure that the connector parts are in the correct relative position.
• All protective elements (lids, covers) must be replaced if damaged.

In order to make sure that any component is malfunctioning, follow the following sequence of actions:

• Turn off the ignition and disconnect the battery.
• Remove the component. Secure the disconnected wiring harness in a hanging position.
• When replacing a component, do not allow oily hands to touch electrical connectors.; insert the connector into the mating part until the latch snaps into place completely.

Disconnecting the battery

Before disconnecting the battery, make sure that the key is removed from the ignition switch. After that, at least 2 minutes must pass before disconnecting the battery. Failure to do so may result in:

• Damage to the hardware of the navigation system
• Incorrect fuel control device readings

Before disconnecting the battery, turn off the alarm system and all power consumers. If you need to remove the radio for repair, you should first disable its code protection.

CAUTION: Do not disconnect the battery when the ignition is on.

CAUTION: To prevent damage to the navigation system hardware, a period of at least 2 minutes must elapse from the moment the ignition is turned off until the moment the battery is disconnected.

CAUTION: To avoid damage to electrical components, always disconnect the battery when repairing or servicing electrical equipment. The ground wire should be disconnected first and reconnected last.

CAUTION: After disconnecting (connections) battery, make sure that the connecting wires do not touch moving parts.

After connecting the battery, turn the steering wheel all the way to the right and left (with the engine running). This is necessary so that the Dynamic Stability Control (DSC) system can calibrate the steering wheel angle sensor. Failure to do so will result in several visual indicators on the control panel being illuminated.

Charging the battery

Do not charge the battery directly on the vehicle. When charging the battery, ensure that the room is well ventilated and take all precautions to avoid the occurrence of open flames or sparks.

Safety precautions when working with the ignition system

The ignition system generates high voltage. Take the following precautions when working on the ignition system.

WARNING: Before working on the ignition system, make sure that the high-voltage terminals, adapters and high-voltage part of the diagnostic equipment are reliably insulated and protected to prevent accidental contact and reduce the risk of injury. People with implanted pacemakers are not allowed to work on the ignition system and diagnostic equipment.

Rules for working with electrical equipment components

Before disconnecting or connecting electrical components, turn off the ignition. This will prevent damage to electronic equipment from voltage surges when disconnecting live components.

The work area and hands must be free of oil, chips and other contaminants. Oil attracts dirt particles that can cause or current leaks. (short circuit) or an increase in circuit resistance.

When handling printed circuit boards, be careful and only handle them by the edges. Remember that some electronic components are sensitive to static electricity.

Never use excessive force to connect connectors.; this requirement applies in particular to printed circuit board connectors. Damaged contacts can cause short circuits or open circuits.

Before starting work and periodically during diagnostics, touch the vehicle's ground with your hand to drain static electricity. Some electronic components can be damaged by static electricity on a person's body or clothing.

Lubrication of electrical components

Some electrical connectors located under the body or under the hood are protected from corrosion by a special lubricant during the production of the car. If the integrity of such connectors has been compromised or the connectors are subject to replacement, they must be treated with a special lubricant: Lubricant catalog number BAU 5811, supplied in 150 gram tubes.

NOTE: Do not use lubricants other than BAU5811. This may cause lubricant to get on the relay and switch contacts and cause intermittent contact loss or failure.