Range Rover P38
86
ELECTRICAL
NEW RANGE ROVER
8
DESCRIPTION AND OPERATION
The following text gives a brief overview of BeCM
functionality and interfaces with other electrical
components.
Engine Management
On all models, the BeCM receives an engine speed
signal from the EDC ECM or the ECM. This signal is
passed to the instrument pack for tachometer
operation and is also passed to the EAS ECU and the
EAT ECU.
Electronic Diesel Control (EDC)
The BeCM inputs a remobilisation code signal to the
EDC ECM when the vehicle is in an unarmed state.
On 95 MY vehicles the BeCM transmits a single
remobilisation code to the EDC ECM. When the
BeCM is satisfied that the vehicle is in an unarmed
state, engine cranking is permitted. There is no MIL
warning lamp illumination to confirm that the code has
been accepted.
On 96MY onwards Diesel vehicles, as on 95MY
vehicles, the EDC ECM does not respond to confirm
that the remobilisation signal from the BeCM has been
accepted. When the vehicle is in an unarmed
condition, the BeCM continually transmits the engine
remobilisation code at 144 ms intervals from the
ignition being turned on. The code originates from the
EDC ECM with each ECM having a different code. If a
new EDC ECM or BeCM is fitted, TestBook must be
used to input the code to the BeCM before the ignition
is turned on.
Engine Control Module (GEMS up to 99MY)
When the vehicle is in an unarmed condition, the
BeCM will transmit and engine remobilisation code 48
ms after the ignition is turned on until the BeCM
receives an acknowledgement that the ECM has
received the correct code.
The ECM confirms receipt of the correct code by
signalling the BeCM to illuminate the check engine
warning lamp and allow engine cranking when
requested. The ECM also enables the engine fuelling
system on receipt of the correct code from the BeCM.
The code sent from the BeCM is unique to the vehicle
and the same code is transmitted each time the
ignition is turned on. If the BeCM is replaced the new
BeCM will automatically generate the same code. If
the GEMS ECM is replaced, TestBook must be used
to input the code to the new ECM.
Engine Control Module (Bosch M5.2.1 from 99MY)
The remobilisation strategy is the same as that
described for 96MY Diesel vehicles. The BeCM
repeatedly transmits the remobilisation code to the
ECM at intervals of 144 ms. The code originates from
the ECM with each ECM having a different code. If a
new ECM or BeCM is fitted, TestBook must be used
to input the code to the BeCM before the ignition is
turned on.
Security
Locking
There are six modes of vehicle locking used on the
vehicle: sill locking, slam locking, key CDL locking,
remote CDL locking, key superlocking and remote
superlocking. The BeCM controls all locking and
alarm functions.
Sill locking
Sill locking is achieved by depressing either of the
front door sill buttons when both front doors are
closed. All doors and the tail door will CDL lock, but
immobilisation and the alarm system will not enable.
Sill locking operates independent of key-in and
ignition state.
On vehicles from 96.5MY an accidental sill locking
feature was introduced to prevent accidental sill
locking of the doors. If the sill button on either of the
front doors is depressed within 0.5 seconds of that
door being closed, all doors will unlock.
If the ignition is on and the inertia switch is tripped, all
doors, including the tail door, will unlock. Further
re-locking is prevented until one of the front doors is
opened with the key removed from the ignition.
