ignition ASTON MARTIN DB7 1997 User Guide

Electrics
Component Index Sheet 2 - 97 MY
Component
Name
Door Lock Switch (Passengers)
Door Mirror - (Drivers)
Door Mirror - (Passengers)
Door Mirror Switch (LHD)
Door Mirror Switch (RHD)
Door Rear Guard Lamp (RH)
Door Rear Guard Lamp (LH)
DPFE Sensor
EDIS Coil Pack
EVR Valve
Exhaust Temperature/Speed Warning
Fan Control Module
Fan Motor 1
Fan Motor 2
Foglamp - RH Front
Foglamp - LH Front
Fuel Filler Flap Solenoid
Fuel Pump 1
Fuel Pump 2
Fuel Tank Pressure Sensor
Fuel Tank Sender Unit
Gear Selector Illumination
Glass Break Sensor
Handbrake Switch
Head/Side Lamp - LH Front
Head/Side Lamp - RH Front
Heated Backlight (Volante)
Heated Backlight (Voiante)
Heated Oxygen Sensor
1
-1
Heated Oxygen Sensor
1
-2
Heated Oxygen Sensor 2-1
Heated Oxygen Sensor 2-2
Heated Washer Jet LH
Heated Washer Jet RH
High Level Stop Lamp
Hood Control Module (Volante Roof)
Hood Motor (Volante Roof)
Horn - LH
Horn - RH
Idle Speed Control Valve (Eng Sub-harness)
Ignition Coil Pack (EDIS)
Ignition Switch
Indicator/Side Lamp - LH Front
Indicator/Side Lamp - RH Front
Inertia Switch
Injector 1
Injector 2
Injector 3
Injector 4
Injector 5
Injector 6
Instrument Pack
Instrument Panel Illumination Control
Instrument Panel Illumination Dimmer Switch
Interior Light - Rear LH
6-44
Component
Location
11-10
n-4
11-11
11-12
11-12
11-7
11-8
3-5
3-9
2-1
1-6
2-7
11-1
11-2
12-3
12-2
12-10
12-7
12-9
12-8
12-6
12-5
7-8
7-5
12-1
12-4
12-11
12-11
2-5
2-5
8-2
8-2
13-3
13-3
13-7
8-4
13-6
1-7
1-7
3-8
3-9
14-5
14-2
14-2
6-9
13-2
13-2
13-2
13-2
13-2
13-2
13-5
7-4
13-8
14-9
fEB^-^?
Circuit
Reference
22-A2
21-A3
22-A5
21-C5
22-C5
21-D2
22-D2
5-C4
5-A5
5-D2
11-C3
3-D2
3-B1
3-C1
1-A1
1-C1
15-A2
16-A5
16-A6
15-C3
16-B4
13-C4
14-C6
14-C5
1-D2
1-A2
15-D3
16-A2
6-D4
14-A6
6-D4
14-A6
5-D3
5-D4
15-82
18-D4
19-B6
1-A3
1-A3
5-C3
5-A5
9-D4
1-C1
1-A1
12-C5
5-B2
5-B2
5-B2
5-B3
5-B4
5-B4

9-A/B5/6

8-C5
9-C4
15-C3
September 1996

Electrics
Relay Location Index - 97 MY 5^^?
Relay Locations
Left Forward
Engine Bay LH Side (from front to
Function
Front Fog Lights
rear)
Cruise Control Clutch Switch(Man)
Air Pump
Horn
Daytime Running Lights
Side Lights
Headlamps
Dip Beam
Main Beam
Starter
Left Forward Fusebox
Base Colour
Brown
Purple
Yellow
Red
Blue
Green
Blue
Black
White
Yellow
Relay/Module Cover.
Blue
Pink
Blue
Blue
Blue
Pink
Blue
Blue
Blue
Blue
Location
1
2
3
4
5
6
7
8
9
10
11
Right Forward
Engine Bay LH Side (from front to rear)
Function Base Colour
Air Con (WOT) Blue
Fan Run-On Yellow
Air Con Green
Cooling Fan Fuses (30A x 2) Black
Fan Timer Control Unit Black
Facia Component Panel - RHD Passenger Side - Left to Right
Function Base Colour
Heated Front Screen Timer Relay Yellow
Multi-Function Module Black
Low Coolant Transmitter Module Black
Main Relay (Red Stripe) Red
Auxiliary Load White
Auxiliary Load Black
Fusebox
Heated Front Screen Fuse 40A Black
Door drop glass thermal cut-out White
Fascia Component Panel - RHD Drivers Side - Left to Right
Function
Gearbox Failure Warning
Ignition Load
Courtesy Lights
Indicator/Flasher Unit
Hazard Warning
Heated Rear Window
Rear Fog Light
Dimmer Module
Fusebox
Base Colour
Black
White
Red
Yellow
Blue
Blue
Brown
Black
Relay/Module
Pink
Pink
Blue
Cover.
Green Maxi Fuse
Cream
Relay/Module
Grey
Black
Black
Silver
Blue
Blue
Cover.
Orange Maxi Fuse
Black
Relay/Module
Pink
Blue
Blue
Black
Black
Blue
Blue
Red
Black
Cover.
Location
1
2
3
4
5
Location
1
2
3
4
5
6
7
8
9
Location
1
2
3
4
5
6
7
8
9
6-64 September 1996

Electrics

Relay Location Index - 97 MY
D^^
Facia Component Panel
- LHD
Passenger
Function
Heated Front Screen Timer Relay
Multi-Function Module
Low Coolant Transmitter Module
Main Relay (Red Stripe)
Auxiliary Load
Auxiliary Load
Fusebox
Heated Front Screen Fuse
Otter Switch (door drop glass)
Side
-
Right
to
Left
Base Colour
Yellow
Black
Black
Red
White
Black
Black
White
Fascia Component Panel
- LHD
Drivers Side
-
Right
to
Left
Function
Gearbox Failure Warning
Ignition Load
Courtesy Lights
Indicator/Flasher Unit
Hazard Warning
Heated Rear Window
Rear
Fog
Light
Dimmer Module
Fusebox
Base Colour
Black
White
Red
Yellow
Green
Blue
Brown
Black
Relay/Module Cover.
Grey
Black
Black
Silver
Blue
Blue
Orange Fuse
Black
Relay/Module Cover.
Pink
Blue
Blue
Black
Black
Blue
Blue
Red
Location
1
2
3
4
5
6
7
8
9
Location
1
2
3
4
5
6
7
8
9

Seat Heater Relays - Beneath the Driver and Passenger Seats
Boot (Trunk) Relays Volante (Front To Rear)

Function
LH Quarter
Up

LH Quarter Down
Hood Down
Hood
Up

RH Quarter Down
Reverse Lights
Fuel Pump
1

Fuel Pump
2

Tilt Sensor
RH Quarter
Up

Stop Lights
Hood Lift Fuse
Fusebox
Hood (Roof) Control Module
Thermal Cut-Outs Quarter Glasses
Base Colour
White
Yellow
Blue
Green
Red
Yellow
Blue
Green
White
Black
Brown
Black
Relay/Module Cover.
Pink
Pink
Pink
Pink
Pink
Blue
Silver (Bosch)
Silver (Bosch)
Pink
Pink
Blue
Green
30A

Black
Location
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

Boot (Trunk) Relays Coupe (Front To Rear)
Function
Stop Lights
Reverse Lights
Fuel Pump 1
Fuel Pump 2
Tilt Sensor
Fusebox
Base Colour
Brown
Yellow
Blue
Green
White
6-66

Relay/Module
Blue
Blue
Silver (Bosch)
Silver (Bosch)
Pink
Cover. Location
1
2
3
4
5
6
September
1996

Electrics
Airbag System
Airbag (Supplementary Restraint System)
Repair Procedures
Description
Two airbaes are fitted to the 97 model year DB7.
The drivers airbag is located in the centre of the
steering wheel (Fig 1-1), the passenger airbag is
located behind the fascia panel (Fig 1-2).
Figure!. Airbag Locations
The following procedures and safety precautions
must be adhered to while handling, installing and
testing airbag modules. Failure to observe these
precautions could cause the airbag to inadvertently
deploy with the risk of personal injury.
The procedures and precautionary guidelines
conform to the 'Handling and storage - The
Explosives Act 1875 & 1923' and to the 'Health and
Safety at Work Act - 1974' or local guidelines as
appropriate.
Safety Precautions and Warnings
Handling Undeployed Airbags
The electrically actuated airbag module contains
sodium azide and sodium nitrate which are
poisonous and extremely flammable substances.
Their contact with
acid,
water or heavy metals may
produce harmful, irritant gases or combustible
compounds.
The airbag module is non-serviceable and must not
be dismantled, punctured, incinerated or welded.
WARNING: Do not attempt any repairs or
electrical measurements on the airbag module.
Never measure the resistance of the airbag module,
as this may cause the airbag to deploy. Suspect
modules must be returned to Aston Martin Lagonda

Limited,
or their importer for replacement.
Tampering or mishandling can result in personal
injury.
Keep away from heat, sparks and open flames. Do
not store at temperatures exceeding 93°C (200°F).
Keep away from electrical equipment as electrical
contact may cause ignition.
Do not drop or impact the airbag module. Always
position the module 'cover-up'.
Ensure that the module connector is protected to
prevent damage. Never carry the airbag module by
the wires or connector.
Store modules in a secure lockable cabinet.
Never position material over the undeployed
module which could be projected and cause injury
in the event of inadvertent deployment.
Do not wrap arms around the module when carrying
and always carry the module with the cover and
vents facing away from the body to avoid personal
injury in the event of inadvertent deployment.
The chemical propellant mixture deploying the
airbag is a solid and therefore inhalation exposure
is unlikely even if the module is ruptured without
deployment.
As far as practical, avoid skin contact
with,
or
ingestion of, the materials present after combustion.
Exposure to high concentrations of propellant
mixture may cause headache, nausea, blurred

vision,
faintness, cyanosis, lowering of blood
pressure, tachycardia and shortness of breath.
WARNING: Sodium azide has been listed as an
'Extraordinary Hazardous Substance or
Carcinogen' by the state of
Massachusetts,
USA.
Sodium azide has been listed on the
'Right
to Know
Hazardous Substance
List'
by the state of New
Jersey and is also regarded as a 'Special Health
Hazard Substance' by the state. The propellant
mixture is sensitive to premature ignition by
electrical sources if not properly protected and
isolated.
September 1996 6-69

Electrics
Airbag System ^^?
Emergency First Aid Procedures
If the airbag is ruptured without deployment and
exposure to the propel lant mixture occurs, observe
the following first-aid treatments:
• Ingestion - Do not induce vomiting and seek
prompt medical attention.
• Skin contact - Immediately wash skin with soap
and water and seek medical attention.
• Eyes - Immediately flush eyes with water for at
least 20 minutes and seek prompt medical

attention.

• Inhalation - Immediately move victim to fresh
air and seek medical attention.
• Physical trauma,
e.g.
burns, abrasions, or impact
due to premature ignition or deployment of the
inflator assembly - Treat symptomatica
I
ly and
seek prompt medical attention.
Safety Procedures
Handling Deployed (Fired) Modules
See 'Emergency First Aid Procedures'
Prevent contact of the inflator with liquids,
combustibles and flammable materials. Failure to
follow these instructions could result in chemical
burns and personal injury.
Ensure that the modules are cool before handling.
After deployment, the airbag surface contains small
deposits of sodium hydroxide which can cause
irritation to the skin and eyes.
When handling deployed airbags, always wear
rubberglovestoBS1651 grade 2 or equivalent, and
chemical resistant goggles to BS 2092 grade 2 or
equivalent.
After handlingdeployed airbags, immediately wash
hands and exposed skin surface areas with mild
soap and water.
Handling Undeployed Damaged Modules
The material inside the module is hermetically
sealed and is completely consumed during
deployment.
No attempt shou
Id
be made to open the modu
le
as
this leads to a risk of exposure to sodium azide.
In the unlikely event of a gas generator being

damaged,
it must be examined by trained personnel
before any attempt is made to remove and/or
deploy.
Full protective clothing must be worn when dealing
with any spillage.
Ruptured units must be stored away from acids,
halogens, heavy metals and metal salts. Damaged
units may produce hydrazoic acid if exposed to
liquids.
Failure to comply with these instructions may result
in fire, noxious fumes and severe personal injury or

death.

Fire Hazard Information
Thermal decomposition or combustion may
produce dense smoke and other dangerous fumes
which infiresituationsformahighlytoxicexplosive.
In the event of a fire, the surrounding area must be
evacuated and all personnel kept well upwind of
the area.
Full fire fighting protective gear and a self contained
breathing apparatus operating in positive pressure
mode must be worn for combating fire. Material
near the fire must be cooled with water spray to
prevent ignition.
Fires should be allowed to burn themselves out if
not threatening to life or property, if fire
is
threatening
to life or property, use copious quantities of water
to extinguish.
Ventilation
Local exhaust ventilation designed by
a
professional
engineer should be provided if vapours, fumes or
dusts are generated whilst working with the airbag
module.
Respiratory Precautions
To prevent the inhalation of dangerous fumes and

dusts,
an approved mask should be worn.
6-70 September 1996

^=2?
Electrics
Airbag System
Eye Protection
Chemical protective goggles are recommended
where there is a possibility of eye contact with the
propellant. Safety glasses with side shields are
recommended for all other operations.
Protective Clothing
Approved protective gloves, overalls and shoes/
boots should be worn.
Handling and Storage Precautions
Do not store airbag modules near live electrical
equipment or circuitry. Store in a dry environment
at ambient temperatures.
Good housekeeping and engineering practices
should be employed to prevent the generation and
accumulation of
dusts.
Store in compliance with all
local state and federal regulations.
Driver and Passenger Airbag Modules
Assembly/Removal/Service Instructions
WARNING: In the event of a vehicle impact where the
airbags and the seatbeltpretensioner (if fitted) are
deployed, the following actions MUST be
performed:
Check the condition of the seatbelts, steering

wheel,
steering column, all connections to airbags,
and the column switchgear connectors for integrity
and damage. If in any
doubt,
replace suspected
parts for new parts.
Replace both crash
sensors,
the
safing sensor
and
the seatbelt pretensioner module (if fitted).
On completion of all repair procedures, switch on
the ignition and check that the
Airbag/SRS
warning
light comes on when the ignition is switched on
and extinguishes after approximately six seconds
indicating satisfactory completion of the airbag
and pretensioner
system
self
tests.

WARNING: Before starting
work,
ensure
that the ignition
switch is in position 'O' and the ignition key is

removed.
Disconnect the battery negative lead
within 12 seconds of switching off the ignition to
prevent the alarm system triggering.
As the airbag control module is equipped with a
back-up power source and due to the risk of the
airbag being inadvertently deployed, wait one
minute or longer after disconnecting the battery
before starting work on the airbag module.
• Disconnectingthe battery negative cable cancels
the memory for the 'one-touch' window down
system and stops the vehicle clock. Reset the
window memory and the clock when work is

completed.

• Never use airbags from other vehicles, always
use new parts.
• After work is completed, reconnect the battery
and perform the airbag warning light check
• Never use electrical probes to check voltage or
electrical resistance of the airbag modules.
• Disconnect the airbag before carrying out any
work on, or in the vicinity of the module, or
when using electric welding equipment.
• Always ensure that the battery negative lead has
been disconnected for at least one minute before
commencing any removal procedure.
September 1996 6-71

'=2?
Electrics
Airbag System
4.5.01.3 Driver's Airbag Module Renew
Read and adhere to all warnings and safety
procedures quoted at the start of this section when
working on airbag modules.

1.
Ensure that the steering system is centralised and
that the steering wheel is in the lowest tilt position.

2.
Disconnect the vehicle battery and insulate the
battery lead to avoid accidental reconnection. Wait
for at least one minute before proceeding with work
on the removal of the airbag.
Hote: The vehicle battery
must be
disconnected within
12 seconds of switching off
the
ignition to avoid the alarm
siren sounding.
5. Carefully remove the module from the steering
wheel and disconnect the airbag module multi-

plug.

6. To ensure personal safety, double check that the
battery is still disconnected and the battery lead
safely insulated. Connect the new airbag module

multi-plug.
Fit and align the new module to the
steering wheel and tighten the two securing torx
screws. Return the steering to the straight ahead

position.

7. Remove the battery lead insulation and reconnect
the battery
lead.

Note:
The vehicle
clockandthe window control unitwill
need
resetting
after completion of
this
procedure.
8. Switch on the ignition and check that the airbag
warni ng
I
ight comes on when the ignition is switched
on and extinguishes after approximately sixseconds
indicating satisfactory completion of the airbag
system self tests.
Insert the ignition key and turn to position I. Turn
the steering wheel to the left, 90° from its straight
ahead position, and loosen thefirstmoduiesecuring
torx screw.
Turn the steering wheehSO" to the rightand loosen
the second module securing torx screw.
September 1996 6-75

Electrics
Airbag System ^^?

7.8.02.6

Renew
Passenger's Airbag Module
Read and adhere to all warnings and safety
procedures quoted at the start of this section when
working on airbag modules.
Disconnect the battery and wait for at least one
minute before proceeding with the airbag removal.
Note:
The
vehicle battery
must
be disconnected within
12
seconds
of switchingoff
the
ignition
to
avoid the alarm
siren sounding.
2. Open the passenger airbag deployment door.
3. Release four nuts and remove the airbag module.

4.
Disconnect the airbag harness multi-plug.
5. Connect and fit the new module and secure with
four nuts.
6. Refit the airbag deployment door.
Note:
The vehicle
clock and
the
window control unit will
need
resetting
after completion of
this
procedure.
7. Reconnect the battery. Switch on the ignition and
check that the airbag warning
I
ight comes on when
the ignition is switched on and extinguishes after
approximately six seconds indicating satisfactory
completion of the airbag system self tests.
6.1.23.1/6.2.10.1 Airbag
Crash
Sensors
Renew
Read and adhere to all warnings and safety
procedures quoted at the start of this section when
working on the airbag system.

1.
Disconnect the battery and wait for at least one
minute before working on the airbag system.
Note: The vehicle
battery
must be disconnected within
12
seconds
of switchingoff
the
ignition
to
avoid thealarm
siren sounding.

4.

5.
Raisethevehicleon a rampand remove the relevant
front roadwheel and wheel arch liner.
Disconnect the sensor connector and feed the
protected loom forward through the body aperture.
Open the bonnet and release two bolts securing the
crash sensor to the body.
Fit and secure the new sensor and feed the sensor
loom back through the body aperture.
Reconnect the sensor. Refit the wheel arch liner
and the roadwheel.
Note:
The vehicle
clock and
the
window control unit will
need
resetting
after completion of
this
procedure.
Reconnect the battery, switch on the ignition and
check that the airbag warning
I
ight comes on when
the ignition is switched on and extinguishes after
approximately six seconds indicating satisfactory
completion of the airbag system self tests.
6-76 September 1996

^7
Electrics
Airbag System

6.4.21.2
Airbag 'Safing' Sensor Renew
Read and adhere to all warnings and safety
procedures quoted at the start of this section when
working on the airbag system.

1.
Disconnect the battery and wait for at least one
minute before working on the airbag system.
Note:
The
vehicle battery must be disconnected within
12 secondsofswitchingoffthe ignition to avoid the alarm
siren sounding.
^h
Note: RH drive shown,
the safing sensor is
always
on
the drivers side
of the car
2. Open the drivers door and remove the lower 'A'
post
trim.

3. Release two screws retaining the airbag safing
sensor.

4.
Disconnect and remove the airbag safing sensor.
5. Connectand securethe replacement sensor. Replace
the 'A' post
trim.

Note:
The
vehicle clock and
the
window control unit will
need
resetting
after completion of
this
procedure.
6. Reconnect the battery, switch on the ignition and
check that the airbag warning
I
ight comes on when
the ignition is switched on and extinguishes after
approximately six seconds indicating satisfactory
completion of the airbag system self tests.

6.4.21.1

Renew
Airbag Diagnostic Module

1.

2.

3.

4.

6.
7.
Read and adhere to all warnings and safety
procedures quoted at the start of this section when
working on the airbag system.
Disconnect the battery and wait for at least one
minute before working on the airbag system.
Note: The vehicle battery must
be
disconnected within
l2secondsofswitchingofftheignitiontoavoidthealarm

siren
sounding.
Disarm the airbags (6.4.21.4).
Remove the facia assembly.
Note: RH drive shown,
diagnostic module always on

passengers
side of
the
car
Disconnect the airbag control module (Fig 1-1).
Release the module from the top of the airbag
carrier assembly and remove the module.
Refit and secure the replacement airbag control
module and connect the harness connector.
Refit the facia assembly.
Rearm the airbags (6.4.21.4).
Note:
The
vehicle clock and
the
window control unit will
need
resetting
after completion of this procedure.
September 1996 6-77

Electrics
Airbag System '=2?
Airbag System Diagnostics
System Description
The airbag system installation comprises:
Airbag Diagnostic Module
Driver and passenger airbag modules
Two front impact (crash) sensors
One 'safing' sensor
Dedicated wiring harness
SRS indicator/warning lamp
The system is designed to provide protection for
both driver and front seat passenger by automatical ly
deploying airbags in the event of
a
collision during
forward travel.
In the event of a collision, the crash and safing
sensors will operate, completing the firing circuit
and causing the airbags to inflate within 32
milliseconds. At least one crash sensor and the
safing sensor must operate to fire the airbags.
Any faults in system components, installation or
wiring will be indicated by a flashing code on the
SRS/AIRBAG warning lamp. Fault code information
may also be monitored using the PDU or scan
tool.

Component Descriptions
Airbag Diagnostic Module
The airbag diagnostic module is mounted on top of
the passenger airbag mountingcage.Thediagnostic
module contains the microprocessor which is
connected to the complete airbag system. The state
of the three system sensors, the two airbag modules
and the wiring harness is constantly monitored by
the microprocessor for faults and for sensor
activation (crash) conditions.
The diagnostic module also confirms correct supply
voltage by comparing
a
direct battery voltage input
with a similar input via the ignition switch.
The diagnostic module contains a reserve power
supply, enabling the airbags to fire even if the
supply voltage is lost due to collision damage. The
reserve power charge will be retained for
approximately one minute if the positive battery
supply is lost in a collision. An auxiliary internal
circuit known as the 'dwell enhancer' provides a
temporary ground if normal system ground was lost
in a collision.
Wiring Harness
A dedicated electrical wiring harness is used to
connect all system components to the bulkhead
harness. To allow free movement of the steering
mechanism, a cable reel cassette is used to connect
the drivers airbag in the steering wheel to the airbag
harness on the steering column.
Airbag Modules
The two airbag modules contain achargeof sodium
azide/copper oxide which wi
11
generate
a
sufficient
volume of nitrogen gas to fully inflate the airbag
when ignited by an electrical impulse. The volume
of gas is greater in the passenger side airbag due to
its larger size.
Both airbag modules, including the surrounding
trim of the drivers airbag, are non-serviceable and
once deployed, must be renewed as a complete
assembly.
Crash and Safing Sensors
The two crash sensors are mounted one at either
side of the bumper mounting cross member, outside
of the bonnet hinges.
The safing sensor is mounted in the base of the
drivers side 'A' post.
The two crash sensors and the safing sensor
determine when airbag deployment is necessary in
a crash condition.
The sensor contacts will only close when the vehicle
suffers a forward impact of sufficient force. At least
one crash sensor and the safing sensor contacts
must close before the airbags will deploy. The
doubletrigger strategy
is
used to prevent deployment
during trivial impacts such as contacts during

parking.

6-78 September 1996