1994 JAGUAR XJ6 Electrical Diagnostic Manual

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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0
0
0
J86-1868
Fig. 1 Seat Motors
11
J86 - 1870
Fig. 2 Seat Motors (Manual)
X300 EDM 15.4 - 21 Issue 1 August 1994

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

Electrical
5. Seat lumbar pump
0 a. Check pneumatic circuit is intact and free from obstructions or blockages. Check
lumbar pad is not damaged or punctured.
b. Examine harness wiring, checking continuity between connector pins as follows:
Switch pack Pump Unit SCM
Pin 1
Pin 11
Pin
3
Pin 2
Pin 3
Pin 1
Pin 9 (connector AI)
C. Test pump resistance between unit pins 1 and 2; a value of approximately 2&2 should
be recorded. Check operation
of pressure switch by attempting to continually inflate
the lumbar pad. On achieving maximum pad pressure the pressure switch should
operate and switch
off the pump supply.
Test solenoid valve resistance between unit pins
3 and 2; a value of approximately 251
should be recorded.
d.
P11
10 1 I
I
I
I
I I I I I I I I I
I
I I II
Fig. 1 Seat Lumbar Pump
X300 EDM 15.4 - 23 Issue 1 August 1994

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6A. Heating (powered seats)
a. Examine harness wiring, checking continuity between SCM connector AI pins 9 and
10. A resistance value of 1.5-3.252 should be recorded indicating all heating
elements intact and thermostat closed.
Check continuity from BPU black 48
-way connector B, pin 38 to center console seat
heater switch module connector pin
5. Operate switch and check continuity from BPU
black 48
-way connector B pin 38 to ground.
Check continuity between cushion heater module and squab heater module pins;
resistance values of
1.0-2.052 and 0.51.252 respectively should be achieved.
Check continuity from SCM connector B2 pin
2, through console switch LED to ground;
a resistance value of 0 - 0.552 should be recorded.
b.
C.
d.
1
J86 - 1872
Fig. 1 Memory Seat Heaters
e
0
0
0

68. Heating (manual seats)
0 a. Examine harness wiring, checking fuse F9 in RH 'A' post base fuse box.
Ensure continuity between heater relay connector pin 85 and BPU yellow 48
-way
connector pin 23. Measure resistance from heater relay pin 87 and console switch
connector pin 10.
Check continuity from BPU black 48
-way connector B pin 38 to center console seat
heater switch module connector pin
4. Operate switch and check continuity from
BPU black 48
-way connector pin 38 to ground.
Check for
+12V supply at seat heater relay connector pins 30 and 86.
Check continuity between cushion heater module and squab module pins; resistance
values
of 1.0-2.052 and 0.5-1.252 respectively should be achieved. Ensure secure
ground connection from squab connector pin 3.
Check continuity from console switch connector pin
10 through console switch LED to
ground;
a resistance value of 0-0.5Q should be recorded.
b.
C.
d.
e.
I' T
I 19 15 16
17 OK
J86 - 1873
Fig. 1 Manual Seat Heaters
Issue 1 August 1994 X300 EDM 15.4 - 25

7. Seat switch pack
a. Examine harness wiring, checking continuity between SCM multi-pin connector A2
and switch pack connector pins as follows:
A2 Pin Function Pack pin
08
09
10
11
14
15
16
17
18
19
20
Squab recline
Seat reward
Seat forward
Common +ve
Headrest lower
Headrest raise
Seat rear lower
Seat rear raise
Seat front lower
Seat front raise
Squab incline
Ground 08
13
06
09
15
16
05
04 14
12
07
01
b. Disconnect harness from switch pack and check continuity of each pin to common +ve
(pin
9) when relevant switch is operated eg operation of seat forward switch will give
continuity between pin
9 and pin 6 of the pack.
Test the operation of the lumbar pump switches
(at pins, 03 and 11) by checking that
voltage on each pin toggles between ground and
+12V with each switch operation.
C.
1 1 1 1 1 P19 1 P16 1 P17 1 P20 1 PO8 1 PW 1 1 1 1 1 1 1 J
P11 P15 P14 Pl8
, P10
P02, I ]I 1 ‘I 14
J86 - 1869
Fig. 1 Seat Switch Pack
X300 EDM 15.4 - 26 Issue 1 August 1994

E I ect r ical rl
Column movement motors 0 8.
a. Examine harness wiring, checking continuity between C / M CM multi-pin connector
and column motor unit connector pins as follows:
CIMCM Motor Function Unit Pin
Connector block
A
Pin 2
Pin 14
Pin 12
Pin 15
Tilt +ve
Tilt
-ve
Reach +ve
Reach
-ve
1
6
1
8
b. Test resistance between tilt motor unit pins 1 and 6; a value of approximately 2Q
should be recorded. Test resistance between reach motor unit pins 1 and 8; a value of
approximately
2Q should be recorded.
Check motor position potentiometers as described in step
9. C.
0
0
0 ~
w6
-
PLG
PS 8 PO5
A Ap’2F P15 ) BP
J86 - i 874
Fig. 1 Column Adjustment Motors
Issue 1 August 1994 15.4 - 27 X300 EDM