1994 JAGUAR XJ6 heater

Climate Control Systems
14.4 TEMPERATURE CONTROL
14.4.1 Coolant Circuit
The main coolant system supplies liquid at engine temperature to the heater matrix to provide heat to the vehicle
interior. Unlike previous air blend / constant matrix temperature systems, in-car temperature is now controlled by
mixing recirculated coolant in the heater circuit with engine-temperature coolant. Matrix temperature is controlled
by a valve which opens to raise temperature (admit engine coolant) and closes to reduce it (recirculates coolant within
the circuit). The coolant flow valve operates on a six (6) second 'duty cycle', during which it may be open for whatever
period thecontrol system dictates. FACEvent airtemperature of howeveriscontrolled bythe'cool air by-passdamper'
which allows incoming air to flow around the top of the the heater matrix and thus remain unheated.
Because the engine coolant pump is driven proportionally to engine speed, the coolant delivery rate changes with
engine revolutions thus causing temperature variations. To stabilize the flow through the matrix, and thus the
temperature, an electrically driven circulation pump has been introduced into the system.
1
1. Engine 2. Coolant flow valve 3. Circulation pump
4. Heater matrix
5. Bottom hose
6. Engine cooling system radiator
Fig.
1 Coolant circuit, schematic view
Issue 1 August 1994 6 X300 VSM

Climate Control Systems
Manual Inputs
Automatic inputs
outputs
14.5 AIR CONDITIONING CONTROL MODULE (A/CCM)
14.5.1 Description
Theclimate control system peripheralscommunicate with theA/CCMvia three main devicecategories, plusthevehicle
power supply and ground connections.
Control panel Face Vent Temperature Control
Temperature and solar sensors
Flap
servo motor potentiometers
Circulation pump
& coolant flow valve
Power
transistor(fan speed control)
Compressor lock sensor
(12 cylinder only)
Instrument pack (coolant temp
& road speed) (engine revolutions via engine control module)
Blower motors (Left
& Right) & associated relays
Flap
servo motors
Heated front
/ rear screens & exterior mirror relays
Motorized in
-car aspirator
Compressor clutch request to engine control module (not
heater-only cars)
Circulation pump relay
Coolant flow valve
X300 VSM Issue 1 August 1994 7

Climate Control Systems
. Centre vent flap
Foot flap
Defrost flap
I I
14.5.2 Control Module Interfaces
. Recirculation switch
. Air con onloff switch
. System onloff switch
. Auto. / Man. select
. Set temperature
. Air flow outlet mode set
. Heated front screen switch
. Heated rear screen &
. External temp. display
. FahrenheiVCentigrade
heated mirror switch
switch
switches
. Solar sensor
. Motorized in-car aspirator
. Ambient temp. sensor
9 Evaporator temp. sensor
. Heater matrix temp. sensor
. Compressor lock sensor
. Face differential temp. control
. Refrigerant pressure switch
. Engine speed signal
. Engine coolant temperature
Vehicle speed signal
Circulation pump
. Coolant flow valve
. Power transistor (fan speed
= Servo motor potentiometers:
signal
control)
LH air inlet flap
RH air inlet flap
Centre vent flap
Foot flap
Defrost flap
Air by
-pass flap
CONTROL PANEL
4
-
4
4
4
4
4
4
A 1 CCM
e I . External temp. display
. Coolant recirculation valve
. Coolant recirculation pump
Cool air by-pass
Air Flow Speed Control
. LH blower motor & power transistor
. RH blower motor & power transistor
. LH high speed relay
. RH high speed relay
. LH air inlet
. RH air inlet
. Compressor
- . Front screen heater (to EMS)
- . Heated rear screen
and door mirrors
Fig.
1 Schematic view AI CCM Inputs & Outputs
0
0
0
0
Issue 1 August 1994 8 X300 VSM

Climate Control Systems
14.7 AIR DlSTRlBUTlON
(Refer to illustrations on this and next page)
Air is drawn from the plenum chamber into the heater/cooler case at the lower front right and left hand sides. All air must first pass through the evaporator (not fitted to heater only cars) and then through the heater matrix for in-car distribution.
When cooler air than that available from the other outlets is desired at the FACE vents, air by
-passes the matrix via
the 'cool air by-pass damper' within the range cold to hot.
The flaps for FOOT, COOL AIR, CENTRE VENT, RH & LH RECIRCULATION and DEFROST are electrically driven by indi- vidual motor / potentiometer units.
1. Face outlet
2. Defrost outlet
3. End-of-dash outlet 4. Cool air by-pass damper
5. Evaporator
6. Air in 7. Foot outlet (front)
8. Foot outlet (rear)
9. Rear face outlet 10. Heater matrix
J82-49L
Fig. 1
\d J82-495 \d J82-L96
(Solid arrow = Hot, Line arrow = Cold)
Fig. 2
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0
0
0
Issue 1 August 1994 10 X300 VSM

Climate Control Systems
Action
Simultaneously hold AUTO and RECIRC - Switch
ignition to ON
Press AUTO
Press FACE
Simultaneously press FACE and HRW
Press
RECIRC (Press FAN to skip actuator check)
Press FAN
14.11 SYSTEM SE1 F-TEST
14.11. I Interrogation Procedure via the Control Panel
Result
Display element check
Any stored fault NUMERIC code
(If ZERO appears there are
no stored codes)
Scroll through stored faults (maximum of
5)
Clear stored fault codes (may need to be repeated for each
fault)
Initiate actuator check (Actuator codes
20 through 27*)
Exit error check mode
Fault Code
0
11
12
13
14
15
21
22
0
23
14.1 1.2 Control Panel Fault Code Key
Item Description
Normal Operation No
fault codes present, wait 30 seconds for system self-
check.
Motorized In
-car Aspirator Open /short in sensor circuit. Panel fault codes are not stored
for motorized in
-car aspirator motor failure.
Ambient Temperature Sensor Open
/ short circuits.
Evaporator Temperature Sensor Open
/ short circuits.
Water Temperature Input Instrument pack output.
Heater Matrix Temperature Sensor Open
/ short circuits.
Solar Sensor Open
/ short circuits.
Compressor Lock Signal
- 12 cylin- Open /short circuits. Low gas charge, low compressor oil,
der and supercharged
6 cylinder loose belt.
engines only.
Refrigerant Pressure Switch Open /short circuits. Low gas charge*
31
32
33
34
35
36 0
I 24 1 Face Vent Demand Potentiometer. 1 Open / short circuits
LH Fresh
/ Recirc. Potentiometer
RH Fresh / Recirc. Potentiometer
cool ~i~ by-pass potentiometer
Defrost Vent Potentiometer
Centre Vent Potentiometer
Foot Vent Potentiometer Open
/short circuit
in potentiometer. feed.
w: and log further faults. Cycling the ignition two or three times
after rectification of the fault will cure this.
In certain circumstances, the motor can over-travel
43
44
I Defrost Vent Motor
I Cool Air by-pass Motor
I 41 I LH Fresh / Recirc. Motor I
Check for short / open circuits in motor drive lines. Motor flap
sticking
/ jammed.
1 42 I RH Fresh / Recirc. Motor I
1 45 I Centre Vent Motor I
46 I Foot Vent Motor
w: In ambient temperatures below Oo C, the system may log fault code 23 because the low ambient causes a tem-
porary low gas pressure. Where the ambient temperature rise above 40" C, and if the engine is close to over- heating, feed to the compressor clutch may be cut and code 23 registered.*
X300 VSM 17 Issue 1 August 1994

I SRO I Rdw* AJ16 v12
Automatic Automatic
Models only Models only
Automatic Automatic
Models only Models only
UK
& ROW -
Manual Seat
only
UK
& ROW -
Manual Seat
onh/
UK & ROW -
Manual Seat
only
Manual Seat
only
UK
& Manual -
Seat only
UK
& Manual -
Seat only
UK
& ROW -
Optional
Optional
Optional Optional
Keylock
Number
13
14
15
16
34
35
17
36
37
38
Driver's Seat Height
Control (Upward)
Driver's Seat Height
Control (Downward)
Passenger Seat
Height Control (Upward)
Passenger Seat
Height Control
(Downward)
Driver's Seat Heater
All Models
All Models
All Models
Passenger Seat
Heater
RH Front
Screen
Heater
LH Front Screen
Heater
Ignition All Models
25
All Models 26
All Models 23
Ignition
Air
-conditioning
Isolate
LH Blower
RH Blower
LH Blower
high
speed
RH Blower high
speed
Deadlock front
lefthear right All
Models All Models
20
Below gear selector 'J' gate.
Not NAS or
Japan
UK
& Europe
only
All Models
All Models
USA
&
Canada only
All Models
All Models
All Models
All Models
Below
gear selector
'J' gate.
Not NAS or
30
UK & Europe 31
All Models 28
All Models 29
USA & 27
All Models 24
All Models 33
All Models 22
All Models 32
Japan
only
Canada only
On
seat panel below
driver's seat.
86.55.78
86.55.74
On seat panel below
driver's seat.
Deadlock front
righthear left
Door Lock
Door Unlock
Driver's Door
Unlock
Mirror Heater
Puddle Lamps
Cigar Lighter
Fuel Flap Lock On
seat panel below
passenger's seat.
On seat panel below
passenger's seat.
On seat panel below
driver's seat.
On seat panel below
passenger's seat.
Left hand side footwell on
front
'A' post, behind cover.
Left hand side footwell on
front
'A' post, behind cover.
Fuse box assembly
RH side heelboard.
Fuse box assembly
LH side heelboard.
Behind
RH side heelboard.
Behind
RH side heelboard.
Behind RH side heelboard.
Behind
RH side heelboard.
Behind
RH side heelboard.
Behind LH side heelboard.
Behind LH side heelboard.
Behind LH side heelboard.
Behind LH side heelboard.
Behind LH side heelboard.
Behind
RH side heelboard.
Behind LH side heelboard.
Behind
RH side heelboard.
Behind LH side heelboard.
Color
Blue
Blue
Violet
Violet
Violet Violet Blue Blue
Blue
Blue
Blue
Blue
Blue
Blue
Blue Blue
Blue
Violet
Violet
Violet
Violet
Violet
Violet Blue
Blue
Violet All
Models All Models
All Models All Models
All Models All Models
18
X300 VSM 35 Issue 1 August 1994

0
Engine Bay Fuse Box - right-hand side
Fuse No. Fuse Colour Code
- F1
F2 Red
F3
F4 Red
F5 Red
-
F6 Tan
F7 Clear
F8 Red
F9 -
FIO Tan
F12 Red
F13 Red
F14 Red F15
-
F16 Red
F17 Light Green
F18 Red
Value
(amps)
10
10
10
5
25
10
-
5
20
10
10
10
10
30
10
Circuit
Not used
Main beam headlamp
- right-hand side
Not used
Lowered beam
headlamD - riaht-hand side ."
Side light -front right-hand side
Turn indicator
-front right-hand side
Side repeater flasher
- right-hand side
Engine control module
(ECM)
Air pump (6 cyl. - where fitted)
Ignition coils
(VIZ)
Air conditioning clutch
Not used
Generator
Front lighting control module
- right-hand
Air conditioning clutch
Windshield wash
J headlamp power wash heaters and relays
Engine management system relay supply
Injectors
Engine management system
Starter relay Ignition coil sensing and air pump relay (6
cyl.)
Fuel injection relay
Engine management sensing
(VIZ)
Windshield washer pump
Lambda heaters
Idle speed control valve
Not used
Air pump control
Solenoid vacuum valve
(VIZ)
Water pump (supercharged)
Headlamp power wash pump
Front fog lamp
- right-hand side (where fitted)
0
0
Issue 1 August 1994 X300 VSM AI-95MY 15

(amps)
F1 Light Blue 15
F3 Light Blue 15
F4 Light Blue 15
F5 Tan 5
F6 F7 Light Green 30
- -
F8 Red 10
F9 Clear 25
FIO Tan 5
F11 Yellow 20 0
Light Green
Light Blue
F18 Light Blue
0'
I
Circuit
Central door locking
Deadlocking (where fitted)
Transmission interlock relay
Key
-switch solenoid relay
Center console switch pack
Interior lighting switch
Seat motors
- left-hand side
Seat motors
- left-hand side
Automatic transmission control module
(TCM)
Not used
Anti
-lock braking system / traction control control module (ABS /
TC CM)
Interior lamps
Luggage compartment lamps
Seat heaters (where fitted)
Data link connector
Fuel pump relay coil
Air conditioning blower motor
- right-hand
Air conditioning
Seat control modules
(SCMs)
Mirror heaters relay
Power assisted steering
Not used
Mirrors, Heated rear window, Cigar lighter
Rear lighting control module
High mounted stop lamp (where fitted)
Window lift (front and rear)
-left-hand side
Windshield wiper system Front screen heaters
Front lighting control module
- left-hand
Water pump relay
Headlamp levelling (where fitted)
Clock
Airbag
Sunroof (where fitted)
Issue 1 August 1994 AI-95MY 17 X300 VSM