Discovery electrical Manual — part 22
CRUISE CONTROL (EXCEPT NAS) (MANUAL TRANSMISSION)
B5
10
CIRCUIT DIAGRAM
Except NAS
PW
0
[1]
D
B5-9
0
[1]
1
C2035
1
C2005
9
C284
X200
Clutch Pedal
Position Switch
[1]
Clutch
Pedal De-
pressed
X112
Brake Switch
Vent Valve
[1]
Brake Pedal
Depressed
Z121
Cruise Control
ECU
2
C2035
2
C2005
6
C218
5
C218
P
PY
PG
P
Manual Trans-
mission
CRUISE CONTROL (MANUAL TRANSMISSION) (NAS)
B5
11
CIRCUIT DIAGRAM
NAS
WY
0
[1]
B5-5
0
[1]
1
C2035
1
C2005
9
C284
X200
Clutch Pedal
Position Switch
[1]
Clutch
Pedal De-
pressed
X112
Brake Switch
Vent Valve
[1]
Brake Pedal
Depressed
Z121
Cruise Control
ECU
2
C2035
2
C2005
6
C218
5
C218
P
PY
PG
P
4
C218
3
C218
WS
D
Z186
Cruise Control
Diode
Manual Trans-
mission
IGNITION AND SHIFT INTERLOCK
C1
CIRCUIT OPERATION
1
REV: 11/97
CIRCUIT OPERATION
Selector Interlock
When the gear selector is in the park position, the
solenoid inside the Transmission Range Selector
Switch (Z110) is de–energised and prevents the
selector from being moved into another gear. To free
the selector, the Ignition Switch (X134) must be in
position II and the brake pedal must be depressed.
When this occurs, voltage from Fuse F1 is applied to
the Transmission Range Selector through the closed
Stop Lamp Switch (X168). The solenoid inside the
Transmission Range Selector Switch is grounded at
E200 through the selector switch, the KS wire and
the B wire. The solenoid now energises, freeing the
selector.
Ignition Key Interlock
On vehicles equipped with the interlock safety
feature, the vehicle must be in park and the transfer
case in high or low gear before the key can be
removed from the ignition. If the gear selector or
transfer gear is out of gear, the key must be cycled
before removal.
If the vehicle is not in park, voltage from Fuse F12 is
applied to the Key Barrel Switch (X230) through the
closed contacts of the Transmission Range Selector
Switch (Z110). When the ignition switch is placed in
the 0 position, the Key Barrel Switch (X230) closes
to energise the solenoid and prevent key removal.
If the key is in the ignition and the transfer box is in
the neutral position, Interlock Relay 1 (K153) is
de–energised since the relay coil is not grounded by
the Transfer Box Position Switch (X175). When the
relay is de–energised, voltage is applied to the Key
Barrel Switch (X230) through the relay’s switch
contacts and the Key–In Switch (X229) causing the
solenoid to energise and prevent key removal.
If the Transfer Box is in the “H” or “L” position, the
Interlock Relay 1 (K153) is energised, since the relay
coil is grounded by the Transfer Box Position Switch
(X175). When the relay is energised, voltage to the
Key Barrel Switch (X230) is interrupted. If the vehicle
is in Park the Transmission Range Selector Switch
(Z110) contacts are open. When the switch contacts
are open, voltage to the Key Barrel Switch (X230) is
also interrupted. The Ignition Key Lock Solenoid
(K191) is then disabled, allowing removal of the key.
Transfer Box Interlock (NAS vehicles with
automatic transmission only)
The Transfer Box Interlock safety feature is designed
to prevent the transfer case shifter from being shifted
out of “H” or “L” unless the vehicle’s gear selector is
in the neutral position.
When the gear selector is placed in the neutral
position, voltage is applied to the Interlock Relay 2’s
coil through the Transmission Range Selector Switch
(Z110). The relay’s coil is grounded through the
Park/Neutral Position Switch (X167).
Interlock Relay 2 now energises and applies voltage
from Fuse F13 to the Transfer Box Solenoid (K161).
When the Transfer Box Solenoid (K161) is energised
the transfer box shifter can be operated.
IGNITION AND SHIFT INTERLOCK
C1
2
CIRCUIT DIAGRAM
10
P126
Fascia Fuse Box
C204
C227
C227
Without ABS
With ABS
S2011
X168
Stop Lamp
Switch
[1]
Brake Pedal
Depressed
[2]
Brake Pedal
Further De-
pressed
1
X168
Stop Lamp
Switch
[1]
Brake Pedal
Depressed
[2]
Brake Pedal
Further De-
pressed
GO
2
15
F 1
15A
[1]
[2]
0
S2042
GP
[1]
C2063
0
GO
1
C2004
C2063
1
C2003
GP
Z206
Stop Lamp
Switch Sup-
pressor
With ABS
Stop Lamps
Without ABS
GO
HJ1
2
GP
HJ3
See Fuse Details
[2]
R
R
1
A
C1-3
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