1997 ASTON MARTIN DB7 ignition

•=2?

Body and Trim
Rear Quarter Window Renewal
9.1.01.1 -
Rear
Quarter Window Renewal
Procedure

1.
Move the front seat forward to gain access.

2.
Switch on the ignition, release the roof locking
latches and lower the roof to approximately the
midway position. Switch off the ignition.
3. Remove the rear seat squab and cushion. Remove
the rear quarter trim panel.

4.
Remove the roof cylinder support bracket securing

bolts.

5. Support the roof, removethecylindertoroofsecuring
bolt. Remove the cylinder bracket.
6. Disconnectthecylinderfromthepivotand carefully
lower the roof.
7. Remove the window motor cover. Disconnect the
window motor feed wires.
Reassembly
Reassembly is the reverse of the removal procedure.
On reconnection of the motor, check the window
height as follows:

1.
Switch on the ignition and raise the rear quarter
windows.

2.
Check that the top of the glass is exactly level with
the top edge of the fully raised door window.
3. Check for
a
complete vertical seal between the rear
quarter window and the door window.

4.
If the rear window alignment is not correct, adjust
it using the procedure in the Wind Noise and
Sealing section.
5. Switch off the ignition and complete the reassembly.
6. Switch on the ignition, raise the roof and recheck
for complete sealing at the rear window top edge.
Figure 1. Window Motor Mountings
8. Release and remove the window motor finisher,
feeding the wires through the grommet.
9. Remove the window motor mounting bracket
securing bolts.

10.
Remove the motor assembly, disengaging it from
the glass.

11.
Remove the window carrier securing nuts and
special washers

12.
Remove the window
adjusters,
d isplace and remove
the window carrier.
May 1996 7-13

^^7
Body and Trim
Rear Quarter Window Lift Motor
9.1.01.4 - Rear Quarter Window Lift
Motor - Left Hand
Procedure

1.
Move the front seat forward to gain access.

2.
Switch on the ignition, release the roof locking
latches and lower the roof. Switch off the ignition.
Remove the rear seat squab and cushion. Remove
the rear quarter trim panel.
Disconnect the window motor feed wires.
Figure 1. LH Window Lift Motor Removal
5. Release and remove the window motor finisher,
feeding the wires through the grommet.
6. Remove the window motor mounting bracket
securing bolts.
7. Remove the motor assembly, disengaging it from
the glass.
8. Remove the motor to carrier securing bolts and
remove the motor.
Reassembly
Reassembly is the reverse of the removal procedure.
On reconnection of the motor, check the window
height as follows:

1.

2.

Switch on the ignition and raise the rear quarter
windows.
Check that the top of the glass is exactly level with
the top edge of the fully raised door window.
Check for
a
complete vertical seal between the rear
quarter window and the door window.
Figure 1. Rear Quarter Window Alignment

4.
If the rear window alignment is not correct, adjust
it using the procedure in the Wind Noise and
Sealing section.
5. Switch off the ignition and complete the reassembly.
6. Switch on the ignition, raise and latch the roof,
recheck for complete sealing at the rear window
top edge.
May 1996 7-15

Body and Trim
Rear Quarter Window Lift Motor '^^
9.1.01.5 - Rear Quarter Window Lift
Motor - Right Hand
Procedure

1.
Move the front seat forward to gain access.

2.
Switch on the ignition, release the roof locking
latches and lower the roof. Switch off the ignition.
3. Remove the rear seat squab and cushion. Remove
the rear quarter trim panel.

4.
Disconnect the window motor feed wires.
Figure 1. LH Window Lift Motor Removal
5. Release and remove the window motor finisher,
feeding the wires through the grommet.
6. Remove the window motor mounting bracket
securing bolts.
7. Remove the motor assembly, disengaging it from
the glass.
8. Remove the motor to carrier securing bolts and
remove the motor.
Reassembly
Reassembly is the reverse of the removal procedure.
On reconnection of the motor, check the window
height as follows:

1.
Switch on the ignition and raise the rear quarter
windows.

2.
Check that the top of the glass is exactly level with
the top edge of the fully raised door window.
3. Check for a complete vertical seal between the rear
quarter window and the door window.
A
Figure 2. Rear Quarter Window Alignment
4. If the rear window alignment is not correct, adjust
it using the procedure in the Wind Noise and
Sealing section.
5. Switch offthe ignition and complete the reassembly.
6. Switch on the ignition, raise and latch the roof,
recheck for complete sealing at the rear window
top edge.
7-16 May 1996

^7
Air Conditioning
Temperature Distribution System
Air Conditioning Function Switch
When AC, DEM or Re-circulation ^v is selected the system engages the Air conditioning compressor using the
electromagnetic clutch. The in-car temperature is automatically corrected to the pre selected level by the system
sensors.
When MAN (manual mode) is selected it provides the operator selection of fan speed and in-car temperature
selection facilities. The in-car temperature is not thermostatically corrected to a predetermined level by the system
sensors.
When ECO is selected the system is in economy mode which allows the fan speed and heating levels to be selected
but gives no cooling. The air conditioning compressor is not engaged putting a minimum load on the engine.
When manual re-circulation is selected the blower flaps are closed and only that air which is in the vehicle is re­

circulated.
When the ignition is turned off the blower flaps revert to the fresh air position.
Refrigeration Cycle
The Compressor draws low pressure refrigerant from the evaporator and by compression, raises refrigerant
temperature and pressure. High pressure, hot vaporised refrigerant enters the Condenser where it is cooled by the
flow of ambient air. A change of state occurs as the refrigerant cools in the condenser and it becomes a reduced
temperature high pressure liquid.
Figure 5.

1.

2.

3.
Compressor
Condenser
Receiver-Drier

4.
Expansion Valve
5. Evaporator
6. Triple Pressure Switch (Trinary switch)
May 1996 8-11

Air Conditioning
Functional Check
Functional Check
This functional check procedure is provided as a simple system validation and is structured to augment the Portable
Diagnostic Unit (PDU).
Stage 1 (Cold engine only, if not proceed to Stage 2)
Procedure Normal System Reaction

1.
Ignition ON
Select MIN temperature, MAN, speed 3, Mid face.
(Engine Stationary) Fans Start

2.
Select MAX temperature Fans continue to run
3. Ignition OFF
Select MAX temperature and defrost
Ignition ON Fans start at maximum speed

4.
Select fan speed
1
Fan speed adjusts accordingly - system OK
Stage 2
Procedure Normal System Reaction

1.
Start up engine and warm up
Select fan speed 1, MAN, MAX TEMPERATURE
and mid face

2.
Open all vents Fans start after 3 seconds

2.
Select fan speed 2 Fan speed increases then stabilises
3. Select fan speed 3 Fan speed increases then stabilises

4.
Select defrost Fan speed steady at high
All air at screen and dash end
5. Re-select fan speed 1
Select AUX ignition key position
6. Slowly select MIN temperature Solenoids switch 1. centre vent

2.
water valve
3. Re-circulation
7. Re-select MID temperature
8. Select DEM Solenoid clicks
Air at screen
9. Select manual re-circulation Solenoid click

10.
Check flap for position

11.
Run Engine to normal temperature

12.
Select: MAN, 3/4 MAX heat and fan speed 2 Air from door vents
cool,

air temp from foot outlet slightly warm

13.
Select MAX temperature and air differential to hot face All vent outlets max temp except screen vent

14.
Select temperature
approx. 1/4 MAX heat and mid face level Cool air from centre vents

15.
Select MIN temperature Blower flaps at re-circulation position
All outlets blowing cold air except screen vent
May 1996 8-15

Air Conditioning
Electronic Control Module r^^?
Description
The ECM (Fig 1) controls the air conditioning
system so that selected temperaturesare maintained.
It cannot be repaired but input and output signals
can be measured, using the PDU, for diagnostic
purposes.
Input-Output Voltage Signals
The following voltage signal levels are input and
output from the ECM:
Digital input levels:
Low
High
Analogue input levels:
General
Blend Flap Potentiometer
Digital output levels
Relays On
Off
Vacuum manifold Pull-in
Drop-out
Analogue output levels
Blend Flap Servo Motors
Blower Motors
0.16 to 1.1V
3.70 to 4.50V
0 to 0.2885 V
0 to 5.0V
8.0V
1.0 to 5.0V
5.6V (typical)
3.5V (typical)
0.5 to 6.5V
0.5 to 2.5V
figure 1.
The ECM
is
turned on when the ignition
is
turned on
to auxiliary position 1. its operating range is 13.5-
14.2 volts.
The ECM power unit supplies +5 volts for the
temperature sensors, feedback potentiometers and
high speed relays.
An integrated circuit protects the ECM against
reversed polarity and voltage surges.
Caution: Take care when connecting test equipment. If
test pins are allowed to be shorted together, to
ground or to positive supplies the ECM will be
damaged.
8-20 May 1996

Air Conditioning
In Car Controls ^2?
Evaporator Sensor
The evaporator sensor allov^^s the ECM to monitor
the temperature ofthe refrigerant in the evaporator
core continuously. When the temperature falls
below 0°C the ECM de-energises the compressor's
electromagnetic clutch and prevents refrigerant
from flowing through the system. The clutch is re­
engaged when the temperature rises.
Motorised In-Car Aspirated Sensor
The motorised aspirator (Fig. 8), which is fitted to
the passenger side facia underscuttle panel,
incorporates a motor driven fan (Fig. 8-1) that
draws air continuously over the in car temperature
sensor (Fig. 8-2).
Figure 8.
Key

1.

2.

3.

4.

5.
to Fig. 8
Motor
Sensor
Fan
Connector SCAO07
Connector SAC030
The motor (Fig. 8-1) is supplied, independently of
the air conditioning
system,
from the ign ition switch
(position 2). Its operating voltage range is 13.5 to
14.2 volts. Maximum current is 120 mA. The sensor

(Fig.
8-2) has a temperature operating range of -
30°C to +85°C. It is fed with 5 volts from the ECM
(pin 43), while the sensing voltage
is
supplied to pin
4 ofthe ECM. At 0°C the sensing voltage is 2.732V
± 0.002V. The rate of change of sensing voltage is
0.01 V± 0.002V per 1°C.
LC/0
0^5
U
Figure 9.
Key to Fig. 9

1.
Ignition switched supply to motor

2.
+5V supply to sensor from pin 43 of ECM
3. Sensor voltage output to pin 10 of ECM

4.
Sensor earth-ground to pin 4 of ECM
5. Motor earth-ground
A. Motor
B. Sensor
Ambient Temperature Sensor
An ambient temperature sensor (Fig. 10-1) is fitted
in the plenum air intake to provide the ECM with
information on the temperature ofthe air entering
the air conditioning unit and so offset the in-car
temperature at extremes of ambient. The voltage
signal output from the sensor is proportional to the
temperature of the surrounding air. The sensor
temperature range is -30°C to 85°C. At 0°C the
output ofthe sensor is 2.732V ± 0.005V. The rate
of change is + 0.01 V ± 0.002V per
1
°C.
Figure 10.
Key to Fig. 10

1.
Ambient temperature sensor

2.
+5 volts from ECM Pin 43
3. Sensing signal to ECM Pin 34

4.
Earth-ground
8-24 May 1996

Air Conditioning
Lower Feedback Potentiomenter "3^^?
Blower Motors Potentiometers
The air conditioning system has two blower motors

(Fig.
1
-7) that operate together to maintain the flow
of air into the car at the desired
level.
The motors are
supplied from an ignition switched supply through
transistorised control circuits fitted in the motor
outlets. The circuits steplessly vary the speed of the
motors at
1
and 2 selections of the mode switch and
operate the motors to high speed when 3
is
selected.
The electronic components are assembled on a
heat sink and include a power transistor (Fig.
1
-9)
and feedback diode (Fig. 1-8). The switches are
supplied and controlled by the ECM.
When the mode switch is set to 3, the high speed
relay (Fig. 1-10) is energised from pin 16 of the

ECM,
opening
a
path to earth-ground, and allowing
full battery voltage to be applied to the motor. At 1
and 2, the motor is supplied with a continuously
variable voltage by the power transistor and the
earth-ground return is made via the ECM. The
feedback diode enables the ECM to sense the
voltage at the negative terminal of the blower
motor.
Lower Feedback Potentiometer
The lower feedback potentiometer determines the
position of the lower blend flap in the air
conditioning unit and feeds this information to the

ECM.
The ECM is thereby able to command the
lower flap servo motor to move the flap to a new
position and maintain the temperature of the air to
the feet and rear outlets at the desired level.
V 1
• 2
V3
Figure 1.
Key to Fig. 1

1.
Output signal from Pin 16 ECM

2.
Power feed
3. Blower feedback
Left hand Pin 22, Right hand 33

4.
Blower output Left Pin 31, Right 32
5. Control switch earth-ground
6. ECM earth-ground Pin 45
7. Blower motor
8. Feedback diode
9. Power transistor

10.
High speed relay
Figure 1.

1.

2.

3.
+5 volts from ECM Pin 43
Feedback signal to ECM Pin 29
Earth-Ground
The potentiometer is supplied with +5V from pin
43 of the ECM and returns its feedback signal via
pin 29. The feedback signal is 10OmV (COLD AIR)
to 1.2 V (HOT A!
R).
The potentiometer also provides
a single feedback signal of 2.9V when the blend
flap is in DEFROST. In this position, the feet and
rear outlets are closed and all air is directed to the

screen.

8-26 May 1996