1994 JAGUAR XJ6 battery

FAULTCODE 21
Safing impact Sensor Incorrectly Mounted to Vehicle
Normal Operation
The DM monitors the resistance value between pins 16 and 3. If a resistance value of greater than 2.051 is detected the
MIL Lamp will illuminate and fault code 21 will be present, indicating incorrect mounting of the safing impact sensor.
Secure connections to ground at both the sensor case and the vehicle are necessary to avoid this fault.
Possible Causes
0 Poor or dirty connection between safing sensor case and vehicle ground.
0 Poor or dirty termination at safing sensor internal ground.
0 Open circuit on wiring between DM pin 16 and safing sensor ground terminal.
Fault Diagnosis
1. Resistance - check
Disarm SRS system.
Disconnect battery ground lead.
Measure resistance between pin 3 (ground) and pin 16 (ground - safing sensor).
Is resistance value greater than 251 ?
No - Proceed to step 2
Yes
- Renew DM
2. Sensor ground
-check
Disconnect safing sensor from harness.
Measure resistance between sensor pin 5 and sensor mounting (chassis ground).
Is resistance value greater than 251 ?
Yes - Proceed to step 3
No - Examine wiring between internal sensor ground and harness connection 10. Rectify faults as necessary.
3. Sensor mounting -check
Remove safing sensor from mounting.
* Clean all mounting surfaces thoroughly and refit sensor.
Re-test resistance between harness connection 10 and sensor internal ground.
* Is resistance value greater than 251 ?
Yes - Renew sensor
No - Refit sensor and connect harness and battery ground lead.
4. On completion
Arm and verify the SRS system.
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Issue 1 August 1994 15.1 - 16 X300 EDM

rl E I ect r ica I
Vbatt 1 9.0 9.5
10.0 10.5
11.0 11.5 12.0 12.5 ~ 13.0
13.5
Vpin
I 2.3 2.4 2.5 2.7 2.8 3.0 3.1
3.2 1 3.4 3.5
FAULT CODE 22
Safing Impact Sensor
Output Circuit Shorted to Battery Voltage
Normal Operation
The DM measures voltage level at pins 11 and 12 which varies in accordance with charging voltage. If voltage
measured at these two pins exceeds
5V the MIL Lamp will illuminate and fault code 22 will be present, indicating a short
to battery voltage.
14.0 14.5 15.0 15.5 16.0
3.7 3.8 4.0
4.1 4.3
Possible Causes
0 Air bag supply
wiring faulty.
0 Safing impact sensor supply wiring faulty.
0 Safing impact sensor internal contacts short circuit.
0 Cable reel cassette faulty
0 Charging system voltage too high (above 17V).
2. Resistance - check
. Measure resistance across safing sensor contacts.
. Does resistance value indicate open circuit.
Yes
-Examine harness wiring for short circuits. Rectify faults as necessary.
No - Renew safing sensor.
3. On completion
Arm and verify the SRS system.
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issue 1 August 1994 15.1 - 18 X300 EDM

Electrical
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FAULT CODE 24
Safing Impact Sensor Output Feed / Return Open Circuit
Normal Operation
The DM measures voltage level at pins 11 and 12 which varies in accordance with battery voltage. DM calculates what
the value at pins 11 and 12 should be from the value measured at pin 13, battery voltage. If voltage measured at pins 11 and 12 is not as expected by DM the MIL Lamp will illuminate and fault code 24 will be present, indicating a safing
sensor circuit fault.
Vbatt
9.0 9.5 1 10.0 10.5
11.0 i 11.5 12.0 12.5 I 13.0 13.5 14.0
14.5 15.0
15.5
Vpin 2.3 2.4 ~ 2.5
2.7
2.8 ~ 3.0
3.1 3.2 1 3.4 3.5 3.7 3.8 4.0
4.1
Possible Causes
0 Air bag wiring fault.
0 Safing impact sensor wiring fault.
0 Grounding of air bag /sensor circuits.
0 Intermittent battery voltage at DM pin 13.
16.0 4.3
Fault Diagnosis
1. Voltage - check
8 Disarm the SRS system.
8 Turn ignition switch OFF, then ON.
8 Measure the voltage between DM pins 11, 12 and pin 3 (ground) and compare to following table.
Are voltages within
0.5V of normal ?
Yes -
8 Check battery +ve input voltage wiring to DM pin 13.. Rectify wiring faults, if any.
8 Check fuse F17 in RH fuse-box, renew if blown.
8 Check battery, renew if necessary.
8 Renew DM if no other faults are located.
8 Proceed to step 2 if both voltages are low.
8 Proceed to step 3 if only one voltage is low.
N
O -
2. Resistance -check
8 Switch off the ignition
and disconnect battery earth lead.
8 Disconnect DM and measure resistance between pin 11 and pin 3.
8 Does resistance value indicate open circuit ?
Yes - Renew DM.
No
-Examine wiring andcomponents insafing sensor, air bag and primarysensorcircuitsforshortstoground. Rectify
faults as necessary.
3. Sensor - check
8 Switch on the ignition.
8 Disconnect safing sensor from main harness and measure resistance across connector wires YP and RN.
8 Is resistance less than 29 ?
Yes - Examine harness wiring for open circuit. Rectify faults as necessary.
No - Renew safing sensor.
4. On completion
8 Arm and verify the SRS system.
X300 EDM Issue 1 August 1994 15.1 - 22

FAULT CODE 44
Front Right Impact Sensor Incorrectly Mounted to Vehicle
Normal Operation
The DM monitors the resistance value between pins 20 and 3. If a resistance of greater than 2.052 is detected the MIL
Lamp will illuminate and fault code 44 will be present, indicating incorrect mounting of the RH impact sensor. Secure
connections to ground at both the sensor case and the vehicle are necessary to avoid this fault.
Possible Causes
0 Poor or dirty connection between RH impact sensor case and vehicle ground.
0 Poor or dirty termination at impact sensor internal ground.
0 Open circuit on wiring between DM pin 20 and impact sensor ground terminal.
Fault Diagnosis
1. Circuit - check
Disarm the SRS system, and disconnect the battery earth lead.
. Disconnect the DM.
Measure resistance between DM pin 20 and pin 3 (ground).
. Is the resistance greater than 2.052.
Yes - Proceed to step 2.
No - Renew DM
2. Sensor - check
. Disconnect RH impact sensor from main harness.
. Measure resistance between sensor terminal 4 and ground.
. Is the resistance greater than 2.052 7
Yes -
. Remove sensor from mountings, clean all mounting surfaces (including chassis) and refit.
. Re-test resistance and renew sensor if value is still above 2.052.
NO -
. Examine harness for broken, dirty or incorrectly seated connectors.
3. On completion.
Arm and verify SRS system.
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Electrical
FAULT CODE 45
Front Left Impact Sensor Incorrectly Mounted to Vehicle
Normal Operation
The DM monitors the resistance value between pins 21 and 3. If a resistance of greater than 2 Lamp will illuminate and fault code 45 will be present, indicating incorrect mounting of the LH
connections to ground at both the sensor case and the vehicle are necessaw to avoid this fa!
Possible Causes
0 Poor or dirty connection between LH impact sensor case and vehicle ground.
0 Poor or dirty termination at impact sensor internal ground.
0 Open circuit on wiring between DM pin 21 and impact sensor ground terminal.
Fault Diagnosis
1. Circuit -check
. Disarm the SRS system, and disconnect the battery earth lead.
. Disconnect the DM.
. Measure resistance between DM pin 21 and pin 3 (ground).
. Is the resistance greater than 2.08.
Yes - Proceed to step 2.
No - Renew DM
2. Sensor - check
. Disconnect RH impact sensor from main harness.
Measure resistance between sensor terminal 4 and ground.
. Is the resistance greater than 2.051 7
Yes -
. Remove sensor from mountings, clean all mounting surfaces (including chassis) and refit.
Re-test resistance and renew sensor if value is still above 2.0Q.
NO -
. Examine harness for broken, dirty or incorrectly seated connectors.
3. On completion.
. Arm and verify SRS system.
Issue 1 August 1994 15.1 -38
!.On is detected the MIL
impact sensor. Secure
Jlt.
Electrical
FAULT CODE 45
Front Left Impact Sensor Incorrectly Mounted to Vehicle
Normal Operation
The DM monitors the resistance value between pins 21 and 3. If a resistance of greater than 2.08 is detected the MIL
Lamp will illuminate and fault code 45 will be present, indicating incorrect mounting of the LH impact sensor. Secure
connections to ground at both the sensor case and the vehicle are necessaw to avoid this fault.
Possible Causes
0 Poor or dirty connection between LH impact sensor case and vehicle ground.
0 Poor or dirty termination at impact sensor internal ground.
0 Open circuit on wiring between DM pin 21 and impact sensor ground terminal.
Fault Diagnosis
1. Circuit -check
. Disarm the SRS system, and disconnect the battery earth lead.
. Disconnect the DM.
. Measure resistance between DM pin 21 and pin 3 (ground).
. Is the resistance greater than 2.08.
Yes - Proceed to step 2.
No - Renew DM
2. Sensor - check
. Disconnect RH impact sensor from main harness.
Measure resistance between sensor terminal 4 and ground.
. Is the resistance greater than 2.051 7
Yes -
. Remove sensor from mountings, clean all mounting surfaces (including chassis) and refit.
Re-test resistance and renew sensor if value is still above 2.0Q.
NO -
. Examine harness for broken, dirty or incorrectly seated connectors.
3. On completion.
. Arm and verify SRS system.
Issue 1 August 1994 15.1 -38 X300 EDM - X300 EDM
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FAULT CODE 53
Front Impact Sensor Circuits Resistance to Ground or Internal Diagnostic Monitor Failure
Normal Operation
The DM measures the voltage on pins 2,6,17 and 18. If there is any resistance to ground on any of these pins or across
the front impact sensors contacts, it will cause the diagnostic voltage on these pins to drop below normal levels. If the
DM measures voltage drop to between 5 and 10 volts, the DM senses an internal voltage regulation failure and code
53 will be present.
A direct short to ground in the front impact sensor circuits
will drop the voltage to less than 5 volts and code 14 will
be present.
!!IQ&: The DM also performs several system self-tests every ignition cycle. If any of these tests fail, fault code 53 will
be present.
Fault Diagnosis
1. System verification
. Disarm the SRS system.
. Disconnect the battery ground lead, allow one minute for DM back-up power to drain.
. Disconnect the DM.
Remove the plastic locking wedge from the grey harness multi-plug connector.
= Measure the resistance between pin 3 (ground) and the following circuits:
. Pin2(ON)
. Pin 6 (VU)
. Pin 17 (KU)
* Pin 18 (KG)
. Are all circuit readings infinite (open circuit) ?
Yes - Renew DM.
No
- Proceed to step 2.
2.
. Using schematic, identify suspect sensor and circuitry.
. Disconnect the suspect sensor.
9 Measure the resistance across the normally open contacts.
. Is the resistance reading infinite (open circuit) ?
Yes - Locate and rectify short to ground on low resistance circuit.
No - Renew front impact sensor.
Impact
sensor open circuit
- check
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Issue 1 August 1994 15.1 - 44 X300 EDM

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
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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