Wiring and Circuit Protection (18.01)
Electric Distribution/E lectronic Control (18.00)
18-1-4 Workshop Manual May 2007
How to Read the Circuits
Below is a simple guide to what symbols mean on the circuit
diagrams. For some of the symbols there are descriptions as
to how they function.
Wires
Wires vary in size to allow diffe rent current to be carried. For
example a wire with a diamet er of 0.50mm (This is the
diameter of all the internal copper strands together) will
carry 11A (dependant on ambient temperature) whilst a wire
with a diameter of 2.00mm will carry 25A.
Twisted Wires
The ‘figure of 8’ shown on circuits as below denotes a
twisted wire and shows the wires that are twisted together.
A wire generates a certain amount of ‘electrical noise’ when
a current is passed through it. By twisting the 2 wires
together the ‘electrical noise’ is cancelled out on each wire
by the opposing wire. This is used more on sensors and
audio speakers.
Screened and Twisted Screen Wires
The signals through a wire can be affected by externally
generated electrical noise. To reduce the external
interference the wires are placed inside a conductive sleeve.
One end of the conductive sleeve is always open whilst the
other end can be terminated to a ground, to a component,
or left open.
Boot Fusebox
Fuse/
RelayRatingFunction
F1 5A Spare
F2 20A Spare
F3 30A Heated rear window
F4 20A Spare
F5 30A Spare
F6 20A Spare
F7 5A Battery disconnect switch (BDS) power
F8 20A Spare
F9 20A Tracker
F10 30A Spare
F11 20A Spare
F12 20A Spare
F13 10A Spare
F14 5A Rear parking assistance module (optional)
F15 5A Spare
F16 30A Spare
F17 5A Spare
F18 30A Audio amplifier
F19 5A Spare
F20 10A Canister vent
F21 30A Spare
F22 20A Exhaust by-pass and vacuum pump
Wire numbers have been deleted from the original
engineering circuits. This al lows the type size to be
increased for improved legibil ity of the service circuits.
173 WR 2.0
Wire No.
Colour
Size
908 GU MAPM 05
Wire No.
Colour
MAP (Defines twisted pair)
Size
Wiring and Circuit Protection (18.01)
Electric Distribution/E lectronic Control (18.00)
18-1-8 Workshop Manual May 2007
Relays
Another significant component in the circuits is a relay, this
is in simple terms a switch that operates on the principal of
electromagnetism. Below is the circuit symbol for a typical
relay. The relay shown below is a normally open relay in its
inoperative state i.e The arm is in the open position.
Relays can have either 4 or 5 terminals on the base. The
circuit of the relay is shown on the base or the side of the
housing. There are 2 types of numbering convention for the
relay terminals, both of which are shown below.
Below is a circuit diagram to show the function and
operation of a relay in a simple circuit.
The current from a battery for example flows through the
wires to the high power normally open switch (The arm
between pins 30 & 87A) and the low power coil (The box
between pins 85 & 86). As you can see in the example above
the lamp is in not illuminated, because the switch is open.
For the relay to operate there needs to be current flow
through the low power coil i.e Current in to the coil then
through to an earth. The current passes through the relay coil
and creates a magnetic field, this magnetic field is strong
enough to ‘grab’ the high power normally open switch.
The magnetic field pulls the switch from it’s normally open
contact to a normally closed contact. The normally closed
contact has a path to an earth, in this case it goes through a
lamp. The high power current then flows through the high power
normally open switch through the lamp and then to an earth.
This can be seen more clearly in the diagram below.Lamp
Illuminates
Busbars
A busbar is where a electrical
supply is fed into a conductive
bar, wire or pcb track and various modules or components
‘tap’ into this busbar to draw their required power. The
Central Electronic Module has 4 of these busbars internally,
each of which is supplied from an external power supply,
that supply can be a battery feed, ignition feed or a switched
supply.
The symbol shown below is the symbol used on the circuits
for a busbar, the number inside the box refers to the busbar
number in the Central Electronic Module.
Fuses
A fuse is a device used to protect a module or component
from excessive electrical current which can cause damage or
destroy that module or component. In practice the fuse is
placed in between the power source and the module or
component that is being protected.
The size or ‘Rating’ of the fuse in amps is calculated
according to the power requirements of the module or
component it is protecting with other factors being taken
into consideration. If the rating has been calculated correctly
then the fuse will ‘blow’ when excessive current passes
through it before any harm or permanent damage occurs to
the module or component it is protecting.
Wiring and Circuit Protection (18.01)
Electric Distribution/Electronic Control (18.00)
May 2007 Workshop Manual 18-1-11
Maintenance
Forward Harness-Renew
Removal
1. Disconnect vehicle battery.
2. Remove LH headlamp (see Workshop Manual procedure 17.01.AB Headlamp Assembly - LH -
Renew).
3. Remove RH headlamp (see Workshop Manual procedure 17.01.BB Headlamp Assembly - RH -
Renew).
4. Release grommet from body, feed harness from inside of vehicle.
5. Disconnect multiplugs (x2) LH and RH side repeaters.
6. Disconnect multiplugs (x2) LH and RH pad wear indicators.
7. Disconnect multiplug (x2) LH and RH wheel speed sensors.
8. Disconnect multiplugs (x2) LH and RH air flow meters.
9. Disconnect multiplugs (x2) LH and RH headlamp bulb
monitoring resistors.
10. Remove nuts (x6) securing LH and RH earth leads to body (x6).
11. Remove screws (x4) LH and RH harness plate to body and release harness from plate.
12. Remove screen washer reservoir (see Workshop Manual procedure 01.16.DA Reserv oir and Motor Assembly -
Windshield Wash - Renew).
13. Remove fusebox (see Workshop Manual procedure 18.01.KD Fuse Box - Engine Bay - Renew).
14. Disconnect multiplug (x1) purge valve.
15. Disconnect multiplug (x1) ABS modulator.
16. Disconnect multiplug (x1) load level sensor.
17. Disconnect multiplugs (x4) forward harness to cabin harness.
18. Remove wiper motor and linkage (see Workshop Manual procedure 01.16.BA Linkage Assembly - Wiper
- Renew).
19. Remove cross member fr ont latch mounting (see
Workshop Manual procedure 01.14.BD Latch Assembly
- Hood - Renew).
20. Remove nuts (x2) securing earth leads to body (x2).
21. Disconnect multiplug (x1) heated front windshield.
22. Disconnect multiplug PAS sensor.
23. Disconnect multiplugs (x2) A/C compressor. 24. Disconnect multiplug (x1) horn.
25. Release forward harness to engine harness multiplug
(x1) from inner wing and di sconnect multiplugs (x2).
26. Disconnect multiplug (x2) cooling fans.
27. Disconnect multiplug (x1) ambient air temperature sensor.
28. Disconnect multiplugs (X2) crash sensors.
29. Release harness clips (70) and remove harness.
Installation
1. Layout harness around engine bay, feed harness into cabin area and secure grommet.
2. Secure forward harness clips (x70) to body.
3. Connect multiplug (x2) LH and RH side repeaters.
4. Connect multiplug (x2) LH and RH pad wear indicators.
5. Connect multiplugs (X2) LH and RH wheel speed sensors.
6. Connect multiplugs (x2) LH and RH air flow meters.
7. Connect multiplugs (x2) LH and RH headlamp bulb
monitoring resistors.
8. Position earth leads (x6), install and torque tighten nuts (x6).
9. Secure harness to plates (x2) and install plates to body.
10. Connect multiplug (x1) purge valve.
11. Install washer reservoi r (see Workshop Manual
procedure 01.16.DA Reservoir and Motor Assembly -
Windshield Wash - Renew).
12. Install fuse box (see Workshop Manual procedure 18.01.KD Fuse Box - Engine Bay - Renew).
13. Connect multiplug (x1) ABS connector.
14. Connect multiplug (x1) load level sensor.
15. Disconnect multiplug (x4) forward harness to cabin harness.
16. Connect multiplug (x1) heated front screen.
17. Connect multiplug (x1) PAS sensor.
18. Connect multiplugs (x2) A/C.
19. Connect multiplug (x1) horn
20. Position earth leads (x2), install and torque tighten nuts (x2).
21. Secure forward harness multiplug (x1) to inner wing and connect multiplugs (x2).
22. Connect multiplug (x2) cooling fans.
23. Connect multiplug (x1) am bient air temperature sensor.
24. Connect multiplugs (X2) crash sensors.
25. Install cross member front latch mounting 01.14.BD Latch Assembly - Hood - Renew).
26. Install wiper motor and linkage (see Workshop Manual procedure 01.16.BA Linkage Assembly - Wiper -
Renew).
27. Install LH headlamp (see Workshop Manual procedure
17.01.AB Headlamp Assembly - LH - Renew).
28. Install RH headlamp (see Workshop Manual procedure 17.01.BB Headlamp Assembly - RH - Renew).
29. Connect vehicle battery.
Repair Operation Time (ROT)
Warning
To prevent damage to elec trical components, always
disconnect the vehicle battery when working on the
vehicle's electrical system. The earth lead (- ve) must be disconnected first and reconnected last.
Wiring and Circuit Protection (18.01)
Electric Distribution/Electronic Control (18.00)
May 2007 Workshop Manual 18-1-27
7. Release/remove LH and RH quarter trim middle panel,
fir tree clips (x8)
8. Remove bolts (x4) and screw (x2) securing LH and RH upper quarter trim moulding to body.
9. Disconnect multiplug (x2) LH and RH speaker.
10. Remove nuts (x6) LH and RH speaker to trim moulding and remove speakers.
11. Feed seatbelt/s through trim moulding aperture and remove moulding.
12. Remove bolts (x4) seat belt bracket to body and position bracket aside.
13. Remove rear floor carpet.
14. Remove nut (x1) and bolt (x1) subwoofer to body.
15. Lift subwoofer assembly and disconnect multiplug (x1) and remove assembly
16. Remove power amplifier (see Workshop Manual procedure 15.01.AB Power Amplifier - Renew).
17. Remove tyre sealant bottle.
18. Remove mobility kit from storage rack
19. Slide fusebox rearwards and release from bracket.
20. Release terminal cover, remove nut (x1) main battery lead to fusebox.
21. Disconnect multiplugs (x2) and remove fusebox.
22. Remove nuts (x6), Star wash ers (x6), plain washers (x6)
and rubber seals (x6) rear lamp assembly.
23. Disconnect multiplug (x2) and remove LH and RH rear
lamp assembly.
24. Remove multi-media module - LH side of luggage compartment (see Workshop Manual procedure
19.07.BB Module - Multi Media - Renew).
25. Remove front floor carpet and A lower post trim panel. - check procedure on refit.
26. Remove bolts (x4) handbrake lever bracket to floor and position lever aside.
27. Remove bolts (x4) footrest bracket to body and floor.
28. Remove brake booster (see Workshop Manual procedure 06.07.AB Brake Booster - RHD - Renew). 29.Disconnect throttle pedal multiplugs (x2) (see Fig. 1).
30. Remove earth headers (x3) (see Fig. 2).
31. Disconnect Stop light switch, Clutch UP switch and
Clutch DOWN switch multip lugs Clipped to body x1)
(see Fig. 3). Fig. 1
Fig. 2
Fig. 3
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Wiring and Circuit Protection (18.01)
Electric Distribution/Electronic Control (18.00)
May 2007 Workshop Manual 18-1-35
11. Connect door harness to main harness multiplug and
secure boot.
12. Connect Crash sensor an d parking brake multiplugs.
13. Connect Fuel pump module, parking aid module (x2) and pre-tensioner multiplugs (clip to body).
14. Install earth header.
15. Install clips (x13).
16. Connect petrol tank multiplug and secure to body
17. Install harness clips (x2).
18. Pull harness from passenger compartment and secure grommet.
19. Connect crash sensor, battery disconnect switch and pre-tensioner multiplugs (clip to body x2).
20. Install battery header.
21. Install earth headers (x2).
22. Secure in-line fuse to body.
23. Secure harness to floor (bolts x4).
24. Install clips (x8).
25. Feed harness into tailgate area and secure grommet (LH).
26. Connect LH tailgate harness multiplug (clip to body).
27. Install LH harness clips (x3).
28. Connect RH tailgate ha rness multiplug (clipped to
body).
29. Feed harness into tailgate area and secure grommet (RH).
30. Install RH harness clips (x4).
31. Install nuts (x7) harness to tunnel.
32. Install earth headers (x2).
33. Connect Airbag module (x2) multiplugs.
34. Install harness clips (x3).
35. Install nuts (x3) harness to tunnel.
36. Install earth headers (x2).
37. Connect Yaw sensor multiplug.
38. Install earth headers (x2).
39. Install nuts (x3) harness to front bulkhead.
40. Install harness clips (x4).
41. Connect fuel filler flap release and interior light
multiplugs.
42. Push rear light harness through body and secure grommet.
43. Install new harness clips (x7).
44. Pull harness from interior, connect Lucar connectors (x2) to AM/FM tuner and clip service loop.
45. Connect GPS (x2) and AM/FM tuner multiplugs.
46. Install bolts (x4) and earth strap for Satellite Navigation mounting plate access.
47. Connect rear bumper harness (x2) and Subframe harness multiplugs (clipped to body x1).
48. Push harness into w/arch area and secure grommet.
49. Install wires to earth headers (x3).
50. Push rear light harness through body and fit grommet. 51. Secure harness to body (x3).
52. Connect Interior light, a
ccessory sockets (x2), battery
disconnect switch, power plug (clipped to body x4).
53. Install new harness clips (x4).
54. Feed harness from cabin th rough bulkhead into under
bonnet area and secure grommet.
55. Connect multiplugs forward harness to main harness (x3) (clip to body).
56. Connect (bolted) multiplug forward harness to main harness (clip to body).
57. Install brake booster (see Workshop Manual procedure 06.07.AB Brake Booster - RHD - Renew
58. Install footrest (bolts x4).
59. Install handbrake lever (bolts x4).
60. Install front floor carpet and a post trim panel.
61. Install multimedia module (see Workshop Manual procedure 19.07.BB Module - Multi Media - Renew).
62. Position LH and RH rear lamp assemblies and connect
multiplugs (x2).
63. Install rubber seals (x3), plain washers (x3), and star washers (x3). Install and tighten nuts (x3).
64. Position fusebox, connect main battery feed, install and torque tighten nut, install terminal cover.
65. Connect multiplugs (x2) and install fusebox in mounting bracket.
66. Install mobility kit.
67. Install tyre sealant bottle.
68. Install power amplifier (see Workshop Manual procedure 15.01.AB Power Amplifier - Renew).
69. Fit rear floor carpet - check procedure
70. Connect multiplug (x1) subwoofer.
71. Install subwoofer (nut x1 and bolt x1).
72. Install seat belt bracket (bolts x4).
73. Install speaker to LH and RH trim moulding (nuts x6).
74. Connect multiplug (x2) LH and RH speaker
75. Feed seatbelt/s through quarter trim moulding.
76. Install quarter trim moulding (bolts x2 and screw x1).
77. Install RH and LH quarter trim middle panel, secure
with clips, Install and tighten screw.
78. Install RH rear wheel arch liner (see Workshop Manual procedure 01.02.JB Wheel Arch Liner - Rear - RH -
Renew).
79. Install central electronic module (see Workshop Manual procedure 18.01.LC Module - Central Electronic -
Renew).
80. Install instrument panel (see Workshop Manual procedure 01.12.AB Instrument Panel - Facia Assembly
- Remove for Access and Refit).
81. Install front header panel (see Workshop Manual procedure 01.05.BB Panel Assembly - Header - Renew).
82. Connect vehicle battery.