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