Range Rover 2. Electrical Manual — part 18
CRUISE CONTROL (DIESEL)
B5
10
CIRCUIT DIAGRAM
Z108
Anti–Lock Brake
System ECU
C116R
28
11
C114
YG
Z238
Body Electrical
Control Module
(BECM)
C258
13
9
Y
C227
29
1
X168
Stop Lamp
Switch
[1]
Brake Pedal
Depressed
C227
2
YP
[1]
[1]
3
0
0
GP
S211
15
F 17
10 A
See Fuse Details
Anti–Lock Brake
System
S203
Z132
Engine Control
Module (ECM)
See Ground Dis-
tribution
B
S207
E252
9
S
50
C112
LHD
C116L
RHD
C572
W
14
C571
20
26
3
680
31
2
S106
14
C202
C121
C102
9
C202
C102
S201
K152
Resistor
S104
Diesel
Diesel
CRUISE CONTROL (DIESEL)
B5
11
CIRCUIT DIAGRAM
REV: 02/98
Z256
Transfer Gear
Box ECU
Z238
Body Electrical
Control Module
(BECM)
4
YG
2
See Ground
Distribution
1
B
S215
E252
C230
8
X200
Clutch Pedal Position
Switch
[1]
Clutch Pedal
Depressed
[1]
0
UB
Automatic
Transmission
C230
C626
3
20
Manual
Transmission
P
0
1
1
R
0
0
1
N
1
0
1
D
1
0
0
3
0
0
0
2
0
1
0
1
1
1
0
Z*
1
1
1
X
Y
Z
1
X294
Gear Box
Position Switch
[1]
X Switch
[2]
Y Switch
[3]
Z Switch
[1]
0
9
UP
2
See Ground
Distribution
6
BG
E621
C562
[2]
0
7
C660
6
10
18
C626
UG
3
[3]
0
C562
C659
C559
5
C560
S608
S609
S610
Automatic
Gearbox
C560
C660
C255
X
Y
Z
Automatic Transmission
Diesel
Switch Open
Switch Closed
Fault
* =
0 =
1=
S603
Automatic
Gearbox
35
NY
34
Z132
Engine Control
Module (ECM)
C603
28
4
C560
C660
3
C572
UN
C581
C551
Manual Transmission
UN
CRUISE CONTROL
B5
TROUBLESHOOTING HINTS
12
TROUBLESHOOTING HINTS
8. If the interior lights operate but the cruise control
switch light does not illuminate, check the bulb, B
wire and RW wire. If the cruise control system
operates but the cruise control switch light does
not illuminate, check bulb and OW wire.
9. Inspect vacuum hoses for kinks and restrictions.
10. Inspect actuator linkage for restrictions and ad-
justment.
11. Check the following two input signals to the
BeCM (Z238): Signal from Clutch Pedal Position
Switch (X200) for vehicles equipped with a ma-
nual transmission, or the X, Y, and Z switch sig-
nals from the Gearbox Position Switch (X294) for
vehicles equipped with an automatic transmis-
sion.
12. For vehicles equipped with a Petrol Engine,
check the following input signal to the BeCM
(Z238): Transfer box in Hi range signal from
Transfer Gear Box ECU (Z256).
13. For vehicles equipped with a Diesel engine,
check the Stop Lamp Switch (X168) inputs to the
Engine Control Module (ECM) (Z132).
14. Note: For vehicles equipped with a manual trans-
mission, cruise control can only be activated
when the Cruise Control Switch (X115) is de-
pressed, the transfer gear box is in Hi range (Pe-
trol only), and the clutch pedal is not depressed.
Also, the BeCM (Z238) will deactivate cruise
control if the engine rpm rises above 5000 +/– 10
percent, due to the possibility of selecting ma-
nual without the use of the clutch (Petrol only).
For vehicles equipped with an automatic trans-
mission, cruise control can only be activated
when the Cruise Control Switch (X115) is de-
pressed, the transfer gear box is in Hi range (Pe-
trol only), and the transmission is in one of the
forward gears. The Transfer Gear Box ECU
(Z256) provides the BeCM (Z238) with transfer
gear box Hi range status. The Transfer Gear Box
Position Switch (X294) provides the BeCM
(Z238) with X, Y, Z switch status (PRND321 po-
sition information).
SYSTEM DIAGNOSIS
1. If the cruise control system does not operate cor-
rectly and the vehicle is equipped with a Petrol
Engine, do Test A.
2. If the cruise control system does not operate cor-
rectly and the vehicle is equipped with a Diesel
Engine, do Test E.
CRUISE CONTROL
B5
13
TROUBLESHOOTING
Test A
OK
OK
OK
OK
3A
1A
2A
CONDITIONS
Ignition Switch
Position: II
CONDITIONS
Ignition Switch
Position: 0
D
D
Less than 1 ohm
2A
GO TO TEST B
PROBLEM CAUSE
B Wire
-
Z121
Cruise Control
ECU
C243
Z121
Cruise Control ECU
C243
B
Cruise Control Switch
On
D
OW
RESULTS
V
B
Within 1.5V of battery voltage
RESULTS
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