Range Rover 2. Electrical Manual — part 167
TRANSFER GEARBOX
B6
CIRCUIT OPERATION
2
Neutral Switch (X293) or Clutch Switch–
pin 34
A shift between ranges is possible when the
transmission is in neutral. The Transmission
Gearbox Control Unit (Z256) senses this via a
Park/Neutral Switch (X293) on automatic
transmission vehicles and via either a clutch switch
or a lever neutral switch on manual transmission
vehicles. This signal is passed via the BeCM (Z238).
Interface to “H– Gate”–
pin 35, 15 (automatic
transmission only)
The H–Gate gets the range information via a High
and Low status signal from the output of the
Transmission Gearbox Control Unit (Z256);
e.g. when the vehicle is in High then the High side of
the “H” is illuminated. When a range change to Low
is requested, the Low side of the “H” starts to flash
whilst the High side stays constant. When Low range
is obtained then the flashing light on the Low side
changes to constant and the High side light goes off.
If a range change is requested and not all of the
conditions are satisfied, then the current range will
stay illuminated and the desired range will flash and
continue flashing until all of the parameters are
satisfied or the request is removed.
If the gear lever is placed in the neutral position for
the gearbox and the transfer box then, after a five
second safety delay, the transfer box moves to
neutral and the lights on both side of the “H” are
extinguished.
Interface to Auto Gear Box Control Unit (Z255)
– pin 35
The High/Low signal to the Auto Gear Box Control
Unit (Z255) comes from the High range status lamp.
If the Auto Gear Box Control Unit (Z255) does not
receive the range information, then an incorrect gear
change mode could be selected, i.e. Manual rather
than Sport in High range and vice versa in Low
range. Also, the shift strategy is different between
the Economy modes of High and Low and so poor
shift quality could result.
Automatic Selector Park Interlock
When the gear selector lever is in the park position,
the shift interlock solenoid is deenergized and
prevents the selector from being moved to another
gear. To free the selector, the Ignition Switch (X134)
must be in position II and the brake pedal must be
depressed.
Current is then supplied to the solenoid through the
PR wire via fuse 13. The solenoid is grounded using
the B wire to the console ground E0808.
The solenoid is now energised, freeing the selector.
The solenoid is energised continuously whilst the
selector lever is in any position other than park and
the Ignition Switch (X134) is in position II.
TRANSFER GEARBOX
B6
3
CIRCUIT DIAGRAM
Z238
Body Electrical
Control Module
(BECM)
C1293
13
4
W
2
23
15
GR
14
NR
30
F 4
30 A
See Ground
Distribution
Automatic
Gearbox
S604
X190
Vehicle Speed
Sensor
E0808
30
U
1
C1319
C0195
P
9
C0989
8
3
C0746
S603
Z256
Transfer Gear
Box ECU
7
C1281
1
21
15
F 7
10 A
W
24
P
C1319
4
Automatic
Transmission
Manual
Transmission
4
C1290
36
4
35
NY
NW
5
C1287
10
29
S601
W
U
Z268
Vehicle Speed
Sensor Shield
Z238
Body Electrical
Control Module
(BECM)
B
B
B
Fuse F11 is only
installed when
towing the vehicle
SCR
F 11*
30 A
*
5
C0903
See Fuse Details
S607
S611
C0868
C1356
TRANSFER GEARBOX
B6
4
CIRCUIT DIAGRAM
C1287
X297
Transfer Switch
Manual
[1]
Change
Range
[2]
On with Lo
Range
Selected
1
C0685
B
6
B
Z256
Transfer Gear
Box ECU
S607
See Ground
Distribution
E0808
C1319
33
2
B
11
C1290
Z238
Body Electrical
Control Module
(BECM)
3
C0685
RU
15
5
GP
[2]
[1]
0
S612
Interior Lamps
PG
2
C1444
3
4
C1391
C1444
1
C1391
B
Manual
Transmission
TRANSFER GEARBOX
B6
5
CIRCUIT DIAGRAM
Automatic
Transmission
X298
Transfer Micro
Switch/Shift Lock
Solenoid
[1]
Transfer Micro
Switch
[2]
Lo Range
Selected
[3]
Shift Lock
Solenoid (with
Shift Lock only)
[4]
Park Switch
Z256
Transfer Gear
Box ECU
6
C1290
Z238
Body Electrical
Control Module
(BECM)
C1319
33
5
2
C0673
PR
With Shift
Interlock
4
0
[2]
[1]
[3]
1
C0673
E0808
S607
S611
With Shift Interlock
PG
B
B
See Ground
Distribution
30
F 13
20 A
3
6
[4]
B
Ignition and Shift
Interlock
PY
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