1994 JAGUAR XJ6 headrest

15.4.1.4 Remote Recall
Remote activation of memory positions 1 and 2 can be achieved using the key fob transmitters (one per set of keys).
lfthe vehicle is unlocked using the remote transmitter the stored driving position will be adopted automatically. If the
vehicle is unlocked using the remote transmitter and an exit position is already set the corresponding entry position
will be adopted until the ignition key is inserted, the stored driving position will then be restored. 0 ~
15.4.1.5
Reverse Mirror Dip
On selection of reverse gear and operation of the mirror toggle switch downwards, the passenger side rear view mirror
will automatically tilt downwards to assist reverse parking. Upward adjustment disables reverse dip, a further down- ward adjustment when still in reverse gear reinstates reverse dip. The mirror will return to normal position when any
other gear position is selected.
15.4.2 SYSTEM COMPONENTS
15.4.2.1 Seats
- Driver and Passenger
The driver and passenger seat adjustment systems comprises the following components:
o Fore / aft motor
o Front raise / lower motor
o Rear raise / lower motor
0 Squab recline motor
0 Headrest motor
0 Lumbarpump
0 Squab heater
0 Inner cushion heater
0 Outer cushion heater
0 Heater thermostat
0 Switch pack
o Seat Control Module (SCM)
o Wiring harness
15.4.2.2 Motors
The five seat position adjustment motors are located below the seat cushions (horizontal and vertical adjustment) and
behind the squab (recline and headrest adjustment). Each motor unit incorporates a potentiometer which provides
directional movement position control via feedbackvoltage variations to the SCM. Positional variations are activated
by the SCM in response to signals from switches mounted on the seat switch pack.
15.4.2.3 Lumbar Pump
The lumbar pump, located behind the seat squab allows adjustment of seat rigidity by increasing/decreasing air pres- sure in the lumbar pad. The pump motor is controlled from a switch on theseat switch pack and governed by an in-line
pressure switch.
A solenoid valve is used to regulate air flow to the lumbar pad.
15.4.2.4 Heaters and Thermostats
The two cushion heaters and squab heater are regulated by a single in-line thermostat and operated by a switch
mounted on thecenter console switch pack. Operation of this switch causesthe Body Processor Unit (BPU) to energize a timed input to SCM (for 11 minute f 1) which in turn causes SCM to energize the heater supply. The supply will
remain on until timed out, although the heater circuit will be broken by the thermostat if the set temperature is ex- ceeded.
Note: Heatingcan only occur when the ignition switch is position I1 and the ambient temperature is belowthe thermo- stat pre-set value of 26°C.
X300 EDM 15.4 - 3 Issue 1 August 1994

E I ect r ical W
1. Recline / incline motor
2. Lumbar pump
3. Headrest motor
4. Lumbarpad
5. Motor potentiometer
10
6. Motor (typical) detail
7. Rear height adjustment motor
8. Seat control module 9. Front height adjustment motor
10. Fore
/ aft motor
Fig. 1 Seat Component Locations
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E I ect r ical
15.4.2.5 Switch pack
The seat switch pack located on the side of the seat cushion houses the following switches:
Headrest; raise
/ lower
Seat cushion
-front; raise 1 lower
Seat cushion
- rear; raise 1 lower
Squab recline
/ incline
Seat assembly forward
/ backward
Lumbar pad firm
1 relax
Each switch has
a dual function and is capable of bi-directional action, so that any setting made can be reversed using
the same switch.
15.4.3 SEAT CONTROL MODULE
The Seat Control Module (SCM) is located inside the seat frame, below the cushions. The SCM controls the actions
of all position adjustment devices by monitoring switch and feedback potentiometer inputs. The SCM also provides
an interface to and from external devices with a bearing on seat operation. The module works in conjunction with the
ColumnIMirror Control Module (C/M CM) and the Securityand Locking Control Module (S/LCM) to provide positional adjustment memory functions as described previously.
There are four connectors to the SCM, designated
AI, A2, B1 and B2, which connect the various inputs 1 outputs and
peripheral devices to the module. Connections are as listed in subsection 15.4.3.1.
A1A2 B1B2
1 1 1
i 11
1 I
6
I
1' ~

1 7i 1 I 1 122
J86 1903 12 22 12 12 7 12
Fig. 1 SCM
Pin Location Diagram
X300 EDM 15.4 - 5 Issue 1 August 1994

Electrical rl
CONNECTOR A2 - 22 PIN, WHITE
0 Pin No. I Description [ Input / Output I Signal
1 I Feedback +VE ref O/P I4.5v
2 Feedback -VE ref O/P ov
3 Headrest feedback I/P 140mV - 4.36V
4 Recline feedback I/P 140mV - 4.36V
5 Fore 1 aft feedback I/P 140mV - 4.36V
6 Cushion rear feedback I/P 140mV - 4.36V
7 Cushion front feedback I/P 140mV - 4.36V
8 Recline rearward switch I/P Switch to +12V
9 Fore / aft rearward switch I/P Switch to +12V
10 Fore 1 aft forward switch I/P Switch to +12V
1 11 Switch pack supply O/P +12v supply
- - r 12 Hardware link to 62/19
13
Auxiliary ground to lumbar O/P Switch to OV
14 Headrest lower switch I/P Switch to +12V ~
15 Headrest
raise switch I/P Switch to +12V
' 16 Cushion rear lower switch I/P Switch to +12V
0 17 Cushion rear raise switch I/P Switch to +12V
18 Cushion front lower switch I/P Switch to +12V
19 Cushion front raise switch I/P Switch to +12V
20 Recline forward switch I/P Switch to +12V
I 21 1 Input seat belt switch I I/P I Switch to OV I
I 22 I Hardware link to pin B2/1 I I- I -
0
18 Brake pedal pressed I/P Switch to OV
19
Hardwire link to A2112
20 O/P seat belt switch O/P Switch to OV
- -
21 Memory set I/P Switch to +12V
22 Dooropen I/P Switch to OV
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E I ect r ica I
15.4.7 SYMPTOM FLOW CHARTS
The following test procedures are designed to test the system as a whole, identifying faulty areas and indicating poss- ible solutions by functional operations.
During all test procedures the entry
/ exit mode switch must be OFF.
The first three test procedures listed i.e. drivers seat position adjustments, steering column position adjustments, rear
view mirror position adjustments must be carried out four times, each time under one of the conditions stated below:
Key in ignition barrel
Ignition key in auxiliary position
Driver’s door open with ignition key out
Driver’s door closed within the last 30 seconds with ignition key out.
0
Driver‘s seat position adjustments
1.
2.
3.
0
4.
5.
6.
7.
0
Locate seat switch pack on the side of the seat cushion.
Operate the fore
/ aft movement control switch. Does the seat respond in the correct
manner?
Yes: Proceed to step 3.
No:
Operate front and rear, raise / lower movement control switches. Does seat respond in the
correct manner in each case?
Yes: Proceed to step 4.
No:
Operate squab recline / incline movement control switch. Does squab respond in correct
manner?
Yes: Proceed to step 5.
No:
Operate lumbar pump inflate / deflate control switch. Does lumbar pad stiffen and slacken
according
I y?
Yes: Proceed to step 6
No:
Operate headrest raise / lower switch. Does headrest respond in correct manner?
Yes: proceed to step
7.
No:
Remove key from ignition, close driver‘s door and allow 30 seconds to elapse. Repeat
steps
1 - 6 and check that adjustment cannot be made.
Test complete; proceed to Memory Position Set.
Abort
test and refer to Diagnostic Sub
-Routines.
Abort test and refer to Diagnostic Sub
-Routines.
Abort test and refer to Diagnostic Sub
-Routines.
Abort test and refer to Diagnostic Sub
-Routines.
Abort test and refer to Diagnostic Sub
-Routines.
Steering column position adjustments
1.
2.
Locate steering column joystick switch the LH side of the column.
Operate switch to give fore
/ aft movement. Does the column respond in correct manner?
Yes: Proceed to step 3.
No:
Operate the switch to give raise / lower movement. Does column respond in the correct
manner in each case?
Yes: Proceed to step 4.
No:
Remove key from ignition, close driver’s door and allow 30 seconds to elapse. Repeat
steps 1
- 3 and check that adjustment cannot be made.
Test complete; proceed to Memory Position Set.
Abort
test and refer to Diagnostic Sub
-Routines.
3.
Abort test and refer to Diagnostic Sub-Routines.
4.
5.
X300 EDM 15.4 - 13 Issue 1 August 1994

Carry out the passenger seat position adjustments procedure below under each of the conditions stated below:
Key in ignition barrel
. Passenger's door open
. Passenger's closed within the last 30 seconds
0 . Auxiliary ON
Passenger seat position adjustments
1.
2.
3.
4.
5.
0
6.
7.
8.
Locate seat switch pack on the side of the seat cushion.
Operate the fore
/ aft movement control switch. Does the seat respond in the correct manner?
Yes: Proceed to step
3.
No:
Operate front and rear, raise / lower movement control switches. Does seat respond in the
correct manner in each case?
Yes: Proceed to step
4.
No:
Operate squab recline / incline movement control switch. Does squab respond in correct
manner?
Yes: Proceed to step
5.
No:
Operate lumbar pump inflate / deflate control switch. Does lumbar pad stiffen and slacken
accordingly?
Yes: Proceed to step
6
No:
Operate headrest raise / lower switch. Does headrest respond in correct manner?
Yes: Proceed to step
7.
No:
Remove key from ignition, close passenger's door and allow 30 seconds to elapse. Repeat
steps
1 - 6 and check that adjustment cannot be made.
Test complete; proceed to Memory Position Set
Abort
test and refer to Diagnostic Sub
-Routines.
Abort test and refer to Diagnostic Sub
-Routines.
Abort test and refer to Diagnostic Sub
-Routines.
Abort test and refer to Diagnostic Sub
-Routines.
Abort test and refer to Diagnostic Sub
-Routines.
Memory
set position - passenger's side
1.
2.
0 3.
4.
5.
6.
7.
0
Insert the key in the ignition.
Operate switches to adjust seat to preferred positions.
Select 'memory' on the passenger's door switch pack. Check that switch surround
i I I um i nates.
Depress desired memory button,
1,2 or 3, on door switch pack within 4 seconds of
memory select. Check that
a chime sounds to confirm memory storage.
Operate the switches
so that memorized positions are changed. Depress relevant memory
option button,
1, 2 or 3 and check that all positional settings are restored as memorized.
Yes: Proceed to step
6.
No:
Remove key from ignition, close door and allow 30 seconds to elapse. Repeat steps 1 - 4
and check that adjustment cannot be made.
Test complete. Abort
test and refer to Diagnostic Sub
-Routines.
X300 EDM 15.4 - 15 Issue 1 August 1994

n E I ectr ical
2A. Seat movement motors (memory seats)
a.
b.
Check motor operation is not obstructed, and that mechanical linkage is not damaged
or disconnected.
Examine wiring harness, checking continuity between SCM Connector
A1 and motor
unit connector pins as follows:
SCM Motor Function Unit Pin
Pin 8 Seat forward 1
Pin
7 Seat rearward 3
Pin 5 Seat rear raise 1
Pin
6 Seat rear lower 3
Pin 3 Seat front raise 1
Pin
4 Seat front lower 3
Check resistance between motor pins 1 and 3, a value of approximately 2S2 should be
indicated.
Check motor position potentiometer as described in test
4.
C.
d.
28. Seat movement motor (manual seats)
a.
b.
C.
d.
Check motor operation is not obstructed, and that mechanical linkage is not damaged
or disconnected.
Check continuity from motor connector pins (1
& 3) to each relay contact connector
(pin
3, raise relay, pin 8, lower relay) respectively.
Check power supply
(+12V) from LH 'A' post base fuse box, fuse F6, to seat switch
connector pin
9.
Check power supply (+12V) from RH 'A' post base fuse box, fuse F3, to pin 5, raise relay
connector and pin 10, lower relay connector.
Check continuity from switch pack connector pin
4 to raise relay connector pin 5 and
from switch pack connector pin 5 to lower relay connector pin
6
Check continuity to ground from raise relay connector pins 2 and 4 and lower relay
connector pins
7 and 9
e.
f.
3. Seat squab 1 headrest motors
a.
b.
Check motor operation is not obstructed, and that mechanical linkage is not damaged
or disconnected.
Examine wiring harness, checking continuity between SCM Connector
A1 and motor
unit connector pins as follows:
SCM Motor Pin
Pin 1 Squab recline 1 incline +ve 3
Pin 2 Squab recline 1 incline -ve 1
Pin 11 Headrest raise
1 lower +ve 1
Pin 12 Headrest raise
1 lower -ve 3
Check resistance between motor pins 1 and 3; a value of approximately 28 should be
indicated.
Check motor position potentiometers as described in step
4.
C.
d.
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n E I ect r ica I
4. Seat motor position potentiometers
a. Examine wiring harness, checking continuity between SCM Connector A2 and motor
unit connector pins as follows:
SCM Motor potentiometer Unit Pin
Pin 1 All units +ve 5
Pin 2 All units -ve 6
Pin 3 Headrest position 3
Pin 4 Squab position 3
Pin 5 Seat fore / aft position 3
Pin 6 Seat rear raise / lower position 3
Pin 7 Seat front raise / lower position 3
b. Check resistance of each motor position potentiometer pins 5 and 6; a value of
approximately IOW1 should be indicated.
Check resistance between motor position potentiometer pin
2 and both pins 5 and 6.
Values in the region of 10051 - 9.9W1 should be recorded, dependent upon motor
position.
C.
J86-18MI
Fig. 1 Seat Motor Potentiometers