L322 Range Rover Service Procedures
GENERAL INFORMATION
03-19
Electrical Precautions
General
The following guidelines are intended to ensure the
safety of the operator while preventing damage to the
electrical and electronic components fitted to the
vehicle. Where necessary, specific precautions are
detailed in the individual procedures of this manual.
Equipment
Prior to commencing any test procedure on the
vehicle ensure that the relevant test equipment is
working correctly and any harness or connectors are
in good condition. It is particularly important to check
the condition of the lead and plugs of mains operated
equipment.
Polarity
Never reverse connect the vehicle battery and
always ensure the correct polarity when connecting
test equipment.
High voltage circuits
Whenever disconnecting live ht circuits always use
insulated pliers and never allow the open end of the
ht lead to contact other components, particularly
ECU's. Exercise caution when measuring the voltage
on the coil terminals while the engine is running, high
voltage spikes can occur on these terminals.
WARNING: – VEHICLES FITTED WITH BI-XENON
HEADLAMP BULBS:– The following precautions
must be observed. Failure to comply may result
in exposure to ultra violet rays, severe electric
shock, burns or risk of explosion.
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Safety goggles and gloves must be worn.
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Ensure that headlamps are switched off before
removing bulbs.
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Do not touch the glass portion of the bulb.
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On no account should headlamps be switched
on with the bulb removed from the headlamp.
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Bulb testing may only be carried out with the
bulb fitted in the headlamp.
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Bulbs must be disposed of in accordance with
local authority bye-laws.
Connectors and harnesses
The engine compartment of a vehicle is a particularly
hostile environment for electrical components and
connectors:
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Always ensure electrically related items are dry
and oil free before disconnecting and
connecting test equipment.
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Ensure disconnected multiplugs and sensors
are protected from being contaminated with oil,
coolant or other solutions. Contamination could
impair performance or result in catastrophic
failure.
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Never force connectors apart using tools to
prise apart or by pulling on the wiring harness.
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Always ensure locking tabs are disengaged
before disconnection, and match orientation to
enable correct reconnection.
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Ensure that any protection (covers, insulation
etc.) is replaced if disturbed.
Having confirmed a component to be faulty:
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Switch off the ignition and disconnect the
battery.
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Remove the component and support the
disconnected harness.
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When replacing the component keep oily hands
away from electrical connection areas and push
connectors home until any locking tabs fully
engage.
Battery disconnection
It is imperative that the key is removed from the
ignition before disconnecting the battery. A time of 2
minutes must also elapse before disconnection.
Failure to do so could result in:
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Navigation computer hardware damage
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Incorrect fuel gauge reading
Before disconnecting the battery, disable the alarm
system and switch off all electrical equipment. If the
radio is to be serviced, ensure the security code has
been deactivated.
CAUTION: Never disconnect the battery with the
ignition switched on.
CAUTION: To prevent damage to the navigation
computer hardware, a waiting period of two
minutes must elapse after the ignition is
switched off before the battery leads are
disconnected.
CAUTION: To prevent damage to electrical
components, always disconnect the battery
when working on the vehicle's electrical system.
The ground lead must be disconnected first and
reconnected last.
CAUTION: Always ensure that battery leads are
routed correctly and are not close to any
potential chafing points.
