Range Rover. Manual — part 311
ELECTRICAL
25
DESCRIPTION AND OPERATION
Engine Running Detection
The BeCM has two methods of detecting that the
engine is running; tachometer pulse monitoring and
alternator charge input.
The tachometer pulse monitoring is used for safety
related functions i.e. memory seat one-touch
inhibition. The engine rpm thresholds for the
tachometer pulse monitoring is as follows:
Petrol 180 rpm
±
10%
Diesel 240 rpm
±
10%.
The alternator charge input is used for load control of
electrical functions. If certain functions are operating
simultaneously, i.e. both rear windows operating and
seat heaters active, the BeCM will determine which
function has priority and temporarily deactivate one
function.
Key Inhibit Solenoid (NAS/JAPAN Only)
NAS and Japanese automatic transmission vehicles
have a key inhibit function which prevents removal of
the ignition key if the automatic transmission selector
lever is not in the PARK position.
The key inhibit function is controlled by the BeCM.
The BeCM de-energises a key inhibit solenoid located
in the ignition switch assembly when a park signal is
passed to the BeCM from the PARK switch located in
the H-gate.
On vehicles up to 97.5MY, the key inhibit solenoid is
not de-energised until the BeCM receives a PARK
signal from the park switch and the ignition is moved
to position 0 (off).
On vehicles from 97.5MY, the key inhibit solenoid is
de-energised via the park switch, irrespective of the
ignition switch position. This overcomes key removal
problems if a rapid key removal is attempted.
86
ELECTRICAL
NEW RANGE ROVER
26
DESCRIPTION AND OPERATION
BeCM pin-Out Information
The following tables show the BeCM inputs and outputs for the nineteen associated connectors.
C112 (up to 99MY)
C1288 (from 99MY)
Pin No.
Description
Input/Output
1
Not used
-
2
Parking brake on
Output
3
Side/Tail door open
Output
4
Gearbox oil temperature (automatic models)
Input
5
Security code
Output
6 and 7
Not used
-
8
Ignition switch position I
Output
9
Engine speed
Input
10
ABS warning lamp and message
Input
11
Brake pressure (brakes on)
Input
12
Not used
-
13
Road speed
Output
14
Catalytic converter overheat (Japanese V8 models) or
glowplug warning lamp (diesel models)
Input
15
Not used
-
16
Fuel level (V8 models)
Output
C113 (up to 99MY)
C1282 (from 99MY)
Pin No.
Description
Input/Output
1
RH headlamp main beam (dual element bulb)
Output
2
Starter motor on
Output
3
RH headlamp dipped beam
Output
4
RH front direction indicator lamp
Output
5
RH headlamp main beam (auxiliary bulb)
Output
6
Headlamp wash/wipe
Output
7
Front wipers fast speed
Output
8
Front wipers slow speed
Output
9
RH front side lamp
Output
10
RH front fog lamp
Output
ELECTRICAL
27
DESCRIPTION AND OPERATION
C114 (up to 99MY)
C1289 (from 99MY)
Pin No.
Description
Input/Output
1
Low screen wash fluid level
Input
2
Inertia switch tripped
Input
3
Front wiper park switch
Input
4
Not used
-
5
Engine warning lamp
Input
6
Not used
-
7
Low engine oil pressure
Input
8
Air suspension wade warning lamp
Input
9
Air suspension messages 1
Input
10
Fuel level
Input
11
Road speed
Input
12
ETC messages and warning lamp
Input
13
Not used
-
14
Bonnet open
Input
15
Alternator charge
Input
16
Low brake fluid level
Input
17
Not used
-
18
Air suspension messages 2
Input
19
Engine coolant temperature
Input
20
Engine speed
Output
86
ELECTRICAL
NEW RANGE ROVER
28
DESCRIPTION AND OPERATION
C120 (up to 99MY)
C1281 (from 99MY)
Pin No.
Description
Input/Output
1
Ignition power supply (SRS DCU)
Output
2
Alarm sounder
Output
3
LH front fog lamp
Output
4
Rear screen washer pump
Output
5
LH front side lamp
Output
6
RH (direction indicator) side repeater lamp
Output
7
Horn
Output
8
LH headlamp main beam (auxiliary bulb)
Output
9
Ignition switch position II
Output
10
LH headlamp main beam (dual element bulb)
Output
11
LH headlamp dipped beam
Output
12
LH front direction indicator lamp
Output
13
Windscreen washer pump
Output
14
LH (direction indicator) side repeater lamp
Output
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