Range Rover 2. Electrical Manual — part 163
CRUISE CONTROL (DIESEL)
B5
10
CIRCUIT DIAGRAM
Z108
Anti–Lock Brake
System ECU
C1584
3
11
C1289
YG
Z238
Body Electrical
Control Module
(BECM)
C1276
13
9
Y
C0075
29
1
X168
Stop Lamp
Switch
[1]
Brake Pedal
Depressed
C0075
2
YP
[1]
[1]
3
0
0
GP
15
F 17
10 A
Anti–Lock Brake
System
S203
Z132
Engine Control
Module (ECM)
See Ground
Distribution
B
S207
E0562
9
S
50
C1288
LHD
C0504
RHD
C0411
W
14
C0203
20
26
3
680
31
2
S106
14
C0229
C0448
C0067
9
C0229
C0067
S201
K152
Resistor
S104
Diesel
Diesel
Not installed on
all vehicles
CRUISE CONTROL (DIESEL)
B5
11
CIRCUIT DIAGRAM
REV: 08/99
Z256
Transfer Gear
Box ECU
Z238
Body Electrical
Control Module
(BECM)
4
YG
2
See Ground
Distribution
1
B
S215
E0562
C0667
8
X200
Clutch Pedal Position
Switch
[1]
Clutch Pedal De-
pressed
[1]
0
UB
Automatic
Transmission
C0667
C1287
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
BS
E0808
C0244
[2]
0
5
C0745
4
3
18
C1287
UG
3
[3]
0
C0244
5
C0988
S608
S609
S610
Automatic
Gearbox
C0988
C0745
C1279
X
Y
Z
Automatic
Transmission
Diesel
S603
Automatic
Gearbox
35
NY
34
Z132
Engine Control
Module (ECM)
C1319
28
3
C0868
C0903
13
C0411
UN
C0203
C0448
Manual
Transmission
UN
1 = Switch Open
Switch Closed
Fault
* =
0 =
CRUISE CONTROL
B5
TROUBLESHOOTING HINTS
REV: 08/99
12
TROUBLESHOOTING HINTS
5. 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.
6. Inspect vacuum hoses for kinks and restrictions.
7. Inspect actuator linkage for restrictions and
adjustment.
8. Check the following two input signals to the
BeCM (Z238): Signal from Clutch Pedal Position
Switch (X200) for vehicles equipped with a
manual transmission, or the X, Y, and Z switch
signals from the Gearbox Position Switch (X294)
for vehicles equipped with an automatic
transmission.
9. 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).
10. For vehicles equipped with a Diesel engine,
check the Stop Lamp Switch (X168) inputs to the
Engine Control Module (ECM) (Z132).
11. Note: For vehicles equipped with a manual
transmission, cruise control can only be activa-
ted when the Cruise Control Switch (X115) is
depressed, the transfer gear box is in Hi range
(Petrol only), and the clutch pedal is not depres-
sed. Also, the BeCM (Z238) will deactivate crui-
se control if the engine rpm rises above 5000 +/–
10 percent, due to the possibility of selecting
manual without the use of the clutch (Petrol
only). For vehicles equipped with an automatic
transmission, cruise control can only be activa-
ted when the Cruise Control Switch (X115) is
depressed, the transfer gear box is in Hi range
(Petrol 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
position 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
C0239
Z121
Cruise Control ECU
B
Cruise Control Switch
On
D
OW
RESULTS
V
B
Within 1.5V of battery voltage
RESULTS
10
1
18
9
C0239
10
1
18
9
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