Range Rover 2. Electrical Manual — part 19

CRUISE CONTROL

B5

14

TROUBLESHOOTING

OK

OK

PROBLEM CAUSE

OK

OK

2B

3A

1B

CONDITIONS

Ignition Switch

Position: 0

WY

CONDITIONS

Ignition Switch

Position: II

Wire

-
-

D

D

D

Cruise Control Switch

On

B

Wire

-

Test B

2A

PROBLEM CAUSE

OW Wire

-
- Body Electrical Control Mod-

ule (BECM)

PROBLEM CAUSE

OW Wire

-

Cruise Control Switch

On

D

RESULTS

Less than 1 ohm

Z238
Body Electrical
Control Module
(BECM)

C255

WY

Z249
Cruise Control Con-
verter/Inverter Module

C241P

V

OW

D

Transfer Box

Hi Range

D

Gear Selector

Forward Gear

D

Clutch Pedal

Released

BAT VOLT

Cruise Control Switch

RESULTS

CRUISE CONTROL

B5

15

TROUBLESHOOTING

OK

OK

OK

OK

2B

3B

CONDITIONS

Ignition Switch

Position: II

BAT VOLT

CONDITIONS

Ignition Switch

Position: 0

D

D

1B

3B

GO TO TEST C

PROBLEM CAUSE

YR, W Wire

-

- B, PB

Wire

Steering Wheel Switches

-

PROBLEM CAUSE

Cruise Control Converter/In-
verter Module

-

C243

RY

On
Off

Z249
Cruise Control Con-
verter/Inverter Mod-
ule

C241P

YR

Less than 1 ohm
More than 10K ohms

=
=

Cruise Control Switch

On

D

RESULTS

Steering Wheel Switches

RES/DECEL Switch

D

On
Off

=
=

0V

RESULTS

Steering Wheel Switches

RES/DECEL Switch

D

Rotary Coupler

-

V

Z121
Cruise Control ECU

CRUISE CONTROL

B5

16

TROUBLESHOOTING

On

Test C

OK

OK

OK

OK

1C

2C

2C

GO TO TEST D

PROBLEM CAUSE

YS,R Wire

-

- Rotary Coupler

Steering Wheel Switches

-

PROBLEM CAUSE

Cruise Control Converter/In-
verter Module

-

Less than 1 ohm

Z249
Cruise Control Con-
verter/Inverter Module

CONDITIONS

Ignition Switch

Position: 0

RESULTS

D

Steering Wheel Switches

SET/ACCEL Switch

D

Off

More than 10K ohms

C241P

YS

=

=

CONDITIONS

Ignition Switch

Position: II

BAT VOLT

D

C243

SY

Cruise Control Switch

On

D

RESULTS

Steering Wheel Switches

SET/ACCEL Switch

D

On
Off

=
=

0 V

V

Z121
Cruise Control ECU

CRUISE CONTROL

B5

17

TROUBLESHOOTING

Test D

OK

OK

PROBLEM CAUSE

OK

OK

3D

1D

2D

GP Wire

-

-

2D

W

Wire

Stop Lamp Switch

-

PROBLEM CAUSE

OR, ON

Wire

-
- Brake Switch Vent Valve

Body Electrical Control
Module (BECM)

-

Released

Z121
Cruise Control ECU

CONDITIONS

Ignition Switch

Position: II

RESULTS

D

Brake Pedal

Depressed

D

BAT VOLT
0 V

C243

GP

=
=

CONDITIONS

Ignition Switch

Position: II

BAT VOLT

D

C243

OR

Cruise Control Switch

On

D

RESULTS

Brake Pedal

D

Depressed
Released

=
=

0 V

V

Z121
Cruise Control ECU

Transfer Box

Hi Range

D

Gear Selector

Forward Gear

D