
Electrical IT 
SECTION CONTENTS 
Sub
-Section 15.2 lnsfrumenfs 
Subsection  Title SRO Page 
15.2 ............. Instruments .................................................................... 15.2-1 
15.2.1 
............ Introduction .................................................................... 15.2-1 
15.2.2 
............ Instrument  Pack Connectors - Pin Locations ......................................... 15.2-3 
15.2.3 
............ Component Description .......................................................... 15.24 
15.2.3.1 .......... Speedometer ................................................................... 15.24 
15.2.3.2 .......... Tachometer .................................................................... 15.24 
15.2.3.3 
.......... Engine  Oil Pressure  and Warning  Lamp ............................................. 15.24 
15.2.3.4 .......... Engine Coolant  Temperature ...................................................... 15.24 
15.2.3.5 .......... Fuel Tank  Level  Gauge and  Warning Lamp .......................................... 15.24 
15.2.3.6 
.......... Battery  Voltage Gauge and  Warning Lamp .......................................... 15.24 
15.2.3.7 
.......... Liquid  Crystal  Display ........................................................... 15.24 
15.2.3.8 .......... Trip Computer .................................................................. 15.2-5 
15.2.4 
............ Primary  Warning  Lamps (Illuminated  Red) .......................................... 15.2-5 
15.2.4.1 
.......... Exhaust  Temperature ............................................................ 15.2-5 
15.2.4.2 
.......... Low  Oil Pressure ................................................................ 15.2-5 
15.2.4.3 
.......... Seat  Belt ....................................................................... \
15.2-5 
15.2.4.4 
.......... Trunk  Lid Open ................................................................. 15.2-5 
15.2.4.5 
.......... DoorAjar ...................................................................... 15.2-5 
15.2.4.6 
.......... Engine  Coolant LeveL ............................................................ 15.24 
15.2.4.7 
.......... SRS Airbag Fault ................................................................ 15.24 
15.2.4.8 .......... Charging Fault .................................................................. 15.24 
15.2.4.9 .......... Brake System  Fault .............................................................. 15.24 
15.2.4.10 ......... Bark Brake ..................................................................... 15.24 
15.2.5. ........... Secondary  Warning Lamps (Illuminated Amber) ...................................... 15.2-7 
15.2.5.1 
.......... Transmission Fault ............................................................... 15.2-7 
15.2.5.2 
.......... Washer  Fluid Level .............................................................. 15.2-7 
15.2.5.3 
.......... Bulb  Fail ....................................................................... \
15.2-7 
15.2.5.4 
.......... Traction  Control Fail ............................................................. 15.2-7 
15.2.5.5 
.......... Anti-lock  Fail .................................................................. 15.2-7 
15.2.5.6 
.......... Low  Fuel Level ................................................................. 15.2-7 
15.2.5.7 
.......... Check  Engine ................................................................... 15.2-7 
15.2.6.1 
.......... Transmission Sport  Mode ......................................................... 15.2-8 
15.2.6.2 
.......... Traction  Control OFF ............................................................ 15.2-8 
15.2.6.3 
.......... Direction  Indicators ............................................................. 15.2-8 
15.2.6.4 
.......... Main  Beam .................................................................... 15.2-8 
15.2.6 
............ Status 
and Warning  Lamps ........................................................ 15.2-8 
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X300 EDM ii Issue 1 August 1994  

Electrical n 
15.2 INSTRUMENTS 
15.2.1 Introduction 
The instrument  pack is a self-contained,  removable unit, which  incorporates all the main  display gauges and  warning 
indicators that  are used  to present vehicle  condition information.  The instrument  pack is programmed during  vehicle 
build,  to match  the vehicle's  individual requirements using  'Programmable Electronic Control Units System' 
(PECUS). This is achieved  via the diagnostic  communication  line, and therefore,  should be renewed  like-for-like.  The primary 
function  of the instrument display is  to provide the driver  with information  usual to normal  driving requirements.  The 
secondary  function is to  display  trip computer information. 
The  trip computer functions  are selected via the  steering  column stalk switch 
(LH). The messages are  displayed in the 
following  order: 
Odometer 
- Distance - Range - Fuel  Used -Average  Fuel -Average Speed - Instant Fuel - Odometer  (return). 
Two  trip computer  switches, 'Reset' and 'Odo',  are incorporated  into the facia  switch  panel. 
Instrument  pack information  is received from sensors  positioned 
at various locations  about the vehicle  (Fig. 1, follow- 
ing  page)  via one  of the  two  multi-pin sockets  located at the rear  of the instrument  pack. 
Information concerning  vehicle condition  and operation is  displayed in one  of three  ways: 
0 Information  necessary to confirm  normal vehicle operation:  road speed,  engine  speed, oil pressure,  battery 
condition, fuel  level, coolant  temperature.  This  information is displayed  using analogue  gauges. 
0 Information indicating the  presence of a hazard/fault condition (low oil pressure/door open  etc.) or operational 
action (indicator flashing / headlamp  full beam  'on'  etc.).  This information  is provided by twenty  two warning 
lampsltell-tales, arranged  in four  groups;  two groups of  seven at the left and  right  sides  of the instrument  pack 
and  two  groups  of four 
at the  bottom  of the instrument  pack. 
0 A Liquid  Crystal  Display  (LCD) is located at the  bottom-centre of the instrument  pack and is  normally  used to 
display the  odometer reading, but it can also  be used  to display  SRS fault conditions  and trip computer informa- 
tion  such  as vehicle  speed, fuel usage  and distance  travelled. 
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X300 EDM 15.2 - 1 Issue 1 August 1994  

Electrical IT 
15.2.2 INSTRUMENT PACK CONNECTORS 
0 
Socket A (24-way) 
Pin Circuit Input 
1. Fuel used 2. 12V ignition  feed 3. Ground 4. Ground 5. Battery feed 6. 12V auxiliary feed 7. Anti-lock fail 8. - 
Socket 6 (48-way) 
Pin  Circuit Input 
1. - 2. Speed  output 1 
3. Speed  output 2 
4. Trip stalk cycle 5. - 6. - 7- 8. - 9. Generator  indicator voltage 10. Brake fluid level 11. - 12. Trip reset 13. Screenwash fluid level 14. Transmission  sport mode 15. Seat belt 16. Luggage  compartment  open 
Pin 
9. 
10. 
11. 
12. 
13. 
14. 
15. 
16. 
Pin 
17. 
18. 
19. 20. 
21. 
22. 
23. 
24. 
25. 
26. 
27. 
28. 
29. 
30. 
31. 
32. 
Circuit Input 
Illumination feed 
- 
- - 
Diagnostic serial  output (K) Diagnostic serial input (L) 
Distance 
- 
Circuit Input 
Park  brake  (on) 
D.I. 
bulb fail - - - 
Check  engine 
Exhaust  temperature 
Main  beam 
- - - - - - - - 
Fig. 1 Pin Locations 
Pin 
17. 
18. 
19. 
20. 
21. 
22. 
23. 
24. 
Pin 
33. 
34.  35. 
36. 
37. 
38. 
39.  40. 
41. 
42. 
43. 
44. 
45. 
46. 
47. 
48. 
Circuit Input 
- 
Coolant  temperature 
Fuel  level 
Oil  pressure 
Coolant  temperature  output 
Tachometer 
input - ECM 
- 
Circuit Input 
Ground - trip keyboard 
Traction  control status 
Trip  clear 
Coolant level 
Side  lights  (on) 
Left  D.I. (on) 
Right  D.I. (on) 
Trip 
km / miles 
General bulb fail 
Transmission  fail 
Air bag  fail 
Door  ajar 
- Driver’s 
Door  ajar - Passenger’s 
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X300 EDM 15.2 - 3 Issue 1 August 1994  

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I I- - I 13 l- 
BLOCK B (W-WAY, GREY) continued 
' 7 Tiltawayonsignal Input  Switched to ground 
8 Gear  selector  not in park  Input Switched to ground 
9 Park brake ON signal  Input 
Switched to ground 
10 Driver's  door open signal  Input Switched to ground 
11 Remote  call active  Input 
Switched to ground 
12 Brake  pedal ON signal  Input 
Switched to ground 
I I 16 1- - - 
Pin No. 
1 
2 
3 
4 
Description I In/ out Signal 
Power  battery i Input 12v 
Power ground  Input ov 
- - - 
JDS 
L I/O Serial  Data 
5 IJDSK I/O 
13 
I I 
Serial Data 
A B C J86 1902 
I j 6 
i7 
'8 
9 
10 
11 
12 
Fig. 1 Control  Module  Pin Location Diagram 
I Lowcurrent  battery  ~ Input 12v 
- - - 
- - - 
- - - 
- - - 
- - - 
- - - 
X300 EDM 15.4-11 Issue 1 August 1994