1997 ASTON MARTIN DB7 air condition

Electrics
Loom Location Diagrams - Up to 97 MY in:m3'^?

Fig1.

1.
Harness, A.B.S RHD

Fig
2.

1.
Harness Bulkhead RHD/LHD

2.
Harness Door
3. Harness Door Mirror

Fig
3.

1.
Harness Cruise Control

2.
Harness Air Conditioning
3. Harness Boot Lid

4.
Harness Seat Beit
5. Earth Strap

Fig
4.

1.
Harness Left Forward

2.
Harness Auto Transmission
3. Harness Auto Transmission Link

4.
Harness Gear Selector Illumination
5. Harness Gearshift interlock
t
6-40 May 1996

^7
Electrics
Component Index Sheet 1-97 MY
Component
Name
ABS ECU
ABS Wheel Speed Sensor - Front RH
ABS Wheel Speed Sensor - Front LH
ABS Wheel Speed Sensor - Rear RH
ABS Wheel Speed Sensor - Rear LH
Airbag Crash Sensor RH
Airbag Crash Sensor LH
Airbag Diagnostic Monitor
Airbag (Drivers)
Airbag (Passengers)
Airbag Safing Sensor LHD
Air Conditioning Compressor Clutch
Air Conditioning Control
Air Conditioning Trinary Switch
Air Conditioning Unit
Air Pump
Air Temperature Sensor (IAT1)
Air Temperature Sensor (IAT2)
Alarm LED Inverter
Alarm Sounder
Alternator (Generator)
Ambient Temperature Sensor
Barometric Pressure Sensor
Blower Fan LH
Blower Fan RH
Bonnet Switch
Boot Lamp LH
Boot Lamp RH
Boot Lock Actuator
Brake Fluid Level Sensor
Camshaft Sensor (CMP)
Capacitor (Generator)
Catalyst Overtemperature/Speed Warning Module
CD Autochanger
Central Locking Unit '
Cigar Lighter
Column Switchgear Assembly
Coolant Low Level Sensor
Coolant Temperature Sensor (ECT)
Coolant Temperature Sensor - Temp Gauge
Courtesy Light
Crankshaft Position Sensor (CKP)
Cruise Control Clutch Switch (RHD)
Cruise Control Disable and Stop Lamp Switch
Cruise Control On/Off Switch
Cruise Control Servo Unit
Cruise Control Set Switch
Diagnostic Socket - Lower
Diagnostic Socket - Upper
Door Closed Microswitch (Drivers)
Door Closed Microswitch (Passengers)
Door Lock Motor (Drivers)
Door Lock Motor (Passengers)
Door Lock Switch (Drivers)
Component
Location
(Figure No.-ltem No.)
1-5
1-3
1-3
8-1
8-1
2-3
2-3
4-2
9-6
9-1
2-6
9-4
9-2
9-5
9-2
9-3
3-7
3-11
7-8
2-4
3-12
1-1
8-6
10-10
10-4
2-2
10-8
10-6
10-7
16-3
3-2
1-2
4-8
5-5
6-10
6-5
10-5
10-3
3-4
3-3
10-9
3-1
10-2
1-4
6-6
2-8
6-7
11-3
11-3
7-6
7-6
11-6
11-9
11-5
Circuit
Reference
(Sheet No.-Coordinates)
20-A1
20-D2
20-D3
20-B6
20-C6
3-D1
1-C3
11-C6
9-A3
11-C4
12-B4
3-C1
3-D3
3-D1
11-CI
1-C2
5-C1
5-B3
14-B6
1-B2
5-A6
1-A2
4-A4
8-A3
12-C3
1-C5
15-A4
16-D3
16-C6
20-B3
5-C1
5-A5
11-C3 Japan Only
10-B3 Rear of Radio
12-D4
13-A3
9-A2
3-A3
5-B1
5-C1
9-B1
5-A2
3-C5
9-A3
13-A5
2-A6
13-B5
10-A6
10-A5
21-A2
22-A2
21-B1
22-Bl
21-A2
September 1996 6-43

Electrics
Component Index Sheet 3 - 97
MY

Component
Name
Interior Light - Rear RH
Key Solenoid
Key-In Warning Switch
Low Coolant Signal Transmitter
Low Level Sensor (Screenwash)
Map Reading Light
Mass Airflow (MAF) Sensor
Multifunction Module
Number Plate Lamp - LH
Number Plate Lamp - RH
Oil Pressure Transducer (EOP)
PATS Module
PATS Transceiver
Performance Mode Switch
Powertrain Control Module (PCM)
Purge Cannister Vent Valve
Radiator Switch
Radio
Radio Aerial
Radio Telephone Connector
Radio Tweeter (LH)
Radio Tweeter (RH)
Rear Lamp - LH
Rear Lamp - RH
Relay - Air Conditioning
Relay - Air Conditioning W.O.T.
Relay - Air Pump
Relay - Auxiliary Load (
Relay - Auxiliary Load (
Relay - Courtesy Lights (
Relay - Clutch (
Relay-Day Time Running (
Relay - Drivers Seat Heater (
Relay - Fan Change-Over (
Relay - Fan Run On
Relay - Front Fog Lamps
Relay - Fuel Pump 1
Relay - Fuel Pump 2
Relay - Gearbox Failure Warning
Relay - Glass Drop
Relay - Hazard Unit
Relay - Headlamp Dipped Beam
Relay- Headlamps
Relay - Heated Front Screen Control
Relay - Heated Rear Window
Relay - Hood Down (Roof Down)
Relay - Hood Up (Roof Up)
Relay - Horn
Relay - indicator Unit (Flasher Unit)
Relay - Left Quarter Light Up
Relay - Left Quarter Light Down
Relay - Load
Relay- Main
Relay - Main Beam
Relay - Passenger Seat Heater
Component
Location
14-6
14-4
14-4
7-13
14-3
10-9
14-1
6-1
14-8
14-7
15-3
4-9
15-4
6-8
4-1
15-7
15-2
5-1
5-4
8-3
5-2
5-2
15-8
15-6
see relay location chart) di II II II
II II II II
II II II II
11 II II II
II II II II
II II II II
II II II II
II II II II
II II II II
11 II II II
II II II II
II II II II
II II It II
II II II II
11 II II II
II II II II
II II II II
II II II II
II II II II
II It II II
II II II II
11 II II II
II II II II
11 II II II
11 II II II
II II II II
II II II II
II II II II
II II II II
II II II II
Circuit
Reference
16-A2
9-D3
9-D3
12-82
3-A2
8-A4
5-D2
12-B5
16-D6
16-C6
5-C4
12-B1
9-C2
4-A2
6-B5
15-B3
5-D1
10-B3
16-C2
16-B5
8-A3
12-C2
15-B6
16-D2
3-A4
3-A5
1-A5
9-D1
12-D1
9-D1
1-B5
1-A6
23-D3
3-C4
3-A3
) 1-B5
) 17-A2
) 17-A4
9-D2
) 12-C1
) 8-C3
2-A2
) 2-B2
) 12-D3
) 8-C4
) 19-A2
) 19-A3
) 1-85
) 8-C3
) 18-A5
) 18-A5
) 12-D1
) 12-D2
) 2-83
) 24-D3
September 1996 6-45

NO COLOUR 285 BLG 28$ BR 287 WLC
288
0
289
8
PIN Al A?
Bl R?
CI C2

AREA 6.A4 e.AI
e.A't

6.A4 6.A4

SHEET 5 AREA 86
NO COLOUI 290
KB
291 KB 292
KB
293
KB
294
R
295
R
296
R
297 NS 298 NS 299 NS 300 YB 237 UIN 273 UIN 301 YB 301 YB 302
UIN
283 UIN 303 UIN 304
YB
305 YB
PIN 1 ? 3 4 5 fi 7 8 9 10 II 1? 13 14 15 16 17 18 19 20
AREA 6.C2 6.A6 6.86 5.85-35 6.B2 5.B5-34 6.B6 6.B2
6.03-42
6.C4-56 6.B6 5.CI 6.D4 6.A2 6.A2 6.C5 6.B4 6.C5 6.B2 5.84-36
NO COLOUI 306 8 186 BY 308 8 309 8 310 8 311 B 312 8 313 8 314 8 315 8 316 8 317 8 317 B 318 e 319 B 320 8 321 8 322 8 323 8 324 8
PIN 1 2 3 4 5 6 7 8 9 10 II 1? 13 14 15 16 17 IB 19 20
AREA 6.A4-52 6.C3
6.B4-53
6.86 6.86
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6.82-45
6.83-47
6.B4-48
6.84-50
6.C3 6.A3 6.A3 6.83 6.C5 6.B5 6.B5
6.84-51
6.B2-46 6.B4-49

NO COLOUR 289 B 287 WLG 285 BLG 286 BR 288
0
PIN 1 ? 3 4
5 6
AREA 6.AI 6.AI 6.AI 6.AI 6.AI

mmm
IZIIXIC6]

HEADER
I
BLACK SOCKET
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HEADER
2
GREY SOCKET

QoWiMlMiMIMIMiWl] HMD
SPL 48 SPL 49 SPL 50
u.

ENGINE ACCESSORIES
I
\,u SHEET 12 AREA A2

NO COLOUF 297 NS 294
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304 YB 238
OK
325
WS
264 OS 268 NB 326 UIN 327 RIN 328
UG
13
WU
330 LGO 155
W
54
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333 P 334 KB 155
KB
290
KB
335
OR
336 0 337 RN 338 OY 339 WR 340 OG

PIN 1 ? 3 4 5 6 7 8 9 10 II 1? IJ 14 15 16 17 18 19 ?n 21 ?? ?3 24

AREA 6.A2 e.A2 6.A2 5. CI 6.C5 5.C5 5.A6 e.B5 6.A6 6.A5
5.D3-32
6.A6 6.A5 6.A6 6.A6
5.02-31
6.D2 6.A2 6.86 6.B5 6.B5 6.A6
5.A4-40
6.A6
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PIN 1 2 3 4 5 6 7 8 9 10 II 1? 13

AREA
6.C4-55
6.A3 6.A6 6.85 6.A5 6.A6 6.A5 6.85 6.02 6.A5 6.A5 6.A5 6.A3

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ENGINE ACCESSORIES
2
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NO COLOUR
328
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135 W
927
LGO
348
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346 UIN 344 RIN
265 RIN 266 UIN
320 8 321 8 270
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170 UN
809 YN
326 UIN 194 VG 350 RIN 228 B 249
RG
239
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255 GU 337 RH 277 GN 336 0
189 SP 171 UR 231 WU 325 WS
319 8 271 e
PIK
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52
AREA
6.C2
6.C2
6.C3 6.C3
6.C3 6.C3
5.A1 5.A1
6.A3 6.A3 5.A5
6.02
6.C3
6.B2 6.C3 6.C5 5.02 5.A3 5.BI 5.C3 6.C2 6.02 6.C2
6.C3 6.02 5.02 6.82
6. A3 5.A5
REAR LAMBDA

SHEET
12
AREA
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NO COLOUH 349 NS 302 UIN 350 RIN 351 YN 352
B
353 NS 303 UIN 354 RIN 355
YO
356 B
PIN 1 ? 3 4 5 6 / 8 9 10
AREA 6.C4-56 6.A2 6.85 6.B6 6.C4-57 6.C4-56 6.A2 6.A6 6.86 6.C5-58

SHEET
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AREA
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NO COLOUR
187 BU 333 P 540 OG
327 RIN
276 RIN 354 RIN 330 LOO
345 UK 261 OG
338 OY
278
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54 G 291 KB
252
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246
GP
242
GB
309 B 310 8 272 U
335 OR
256
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236 RIN 279 UB 284 RIN 229 YR 257 U 296
R
300 YB
274 RY 282 HG 351 YN 355
YO
292
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254
GY
248
GO
244
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311 8
PIN 53 54 55 56 57 56 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 a?
83 84
85 86 87 88 89 90
91 92
93 94 95 96
97 98
99 100
101 102 103 104
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6.C3 e.C2 6.C2
6.82
6.04 6.C5 6.C2
6.C3 5.C4
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6.C2
5.C3
5.CI 6.02 6.04 5.02 5.C3 e.A2 6.A2
6.04 6.04
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6.C5 6.A2
5.B5 5.A3 5.B2
6.A3
NO COLOUR 170
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171
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172
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4 5 6
AREA 6.85 6.C2 6.85 5.01

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278
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3
198
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AREA 6.B5 6.A6 6.66 6.C3
AIR CONDITIONER
FRONT LAMBDA
II
NO COLOUR
PIN
226 NS
I
274
RY 2
275 UIN
3
276 RIN
4

REAR LAMBDA
21

AREA
6.03-42 6.86
6.A2
6.A6
3
NO COLOUR PIN 261 NS 1 282
RG
2 283 UIN 3 284 RIN 4
AREA
6.03-42
6.86 6.A2 6.86
Wiring Diagram
Model - Aston Martin DB7
Harness Title - Engine 2
Part No. - B37-84631
Revision - 0 Sheet 6 of 26 - 97 MY

^=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

Electrics
Airbag System =7?
Spillage and Leakage
If material is spilled or released, contact Aston
Martin Technical Support for advice on clean-up
procedures. All personnel must be kept away from
the contaminated area.
Do not dispose of contaminated propellant or
water into storm or sanitary sewers, ground water
or
soil.

Spills may be reportable to state and/or federal
authorities.
Materials must be disposed of by incineration or
chemical oxidation under carefully controlled
conditions by specially trained individuals and in
accordancewith local stateandfederal regulations.
Scrapping Vehicles with Live Airbags
when scrapping a vehicle with live airbags, first
deploy the airbags in accordance with the following
procedure. This procedure assumes that the airbag
wiring is undamaged
See Handling/Safety Information.
If the airbags are to be removed, see the airbag
module assembly/removal/servicing instructions.
Equipment required:
Four insulation displacement connectors
(scotch locks).
Charged 'slave' battery.
Two 10 metre lengths of
1
mm^ wire fitted with
crocodile clips on one end.
Procedure
WARNING: The deployment procedure must be
carried out outdoors away from other personnel.

1.
Remove any loose debris from around the airbag
modules and ensure that no flammable liquids are
present.

2.
Disconnect the vehicle battery.
WARNING: Always connect to the airbag
first,
as

the bag will deploy immediately on connection to
the battery.
3. Remove the passenger side airbag deployment
door and underscuttle panel.

4.
Remove the drivers side underscuttle panel.
5. Disconnect the airbag connector for the spiral
cassette under the fascia and at the wire (drivers

side).

6. Locate the harness connectors and cut the wires
leading from the airbag just above the mating plug
(passengers side).
Note: The harness connected between the driver's

airbag
and the connector
has
one red
feed
wire and
one

grey/orange return
wire.
The
harness
connected between
the
passenger's
airbag and the connector
has
one blue/

orange
feed wire and one
pinl return wire.
6-72 September1996

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

Electrics
Airbag System [EE:^^^?
Continuous Airbag Warning Lamp
Inoperative lamp circuit or no ignition supply to the
airbag diagnostic module.
Normal Operation
The airbag warning lamp is designed to illuminate
for approximately six seconds when the ignition is
switched
on.
This period isallocated for satisfactory
performance of the airbag system self test. If after
this period, the diagnostic module detects a fault
within the system, the airbag warning lamp will
begin to flash.
Note:
The seat
belt
pretensioner system
(if fitted)
shares

the
airbag/SRS
warning lamp with
the airbag
system.
If a
seat belt pretensioner fault is
detected,
the
Airbag/SRS

warning lamp will be permanently illuminated. Ensure
thata permanently lit
lamp
is nottheresultof a pretensioner
fault before carrying out fault analysis on the airbag
system.
Poor connection or disconnection of the diagnostic
module harness may cause a short circuit from DM
pin 4 (warning lamp control) to pin 5 (ground) and
cause permanent illumination ofthe warning lamp.
Faulty operation of the diagnostic module internal
logic may fail to turn off the warning lamp control
circuit and cause constant illumination of the
warning lamp.
Fault Analysis
WARNING: Read and adhere to all warnings and
safety procedures at the start of this section when
working on the airbag system.

1.
Disarm the airbag system and fit airbag simulators
(6.4.21.4). Reconnect the battery.

2.
Inspectthe instrument pack and diagnostic module
connectors for damaged, pushed out pins, proper
location etc.
If any defects are identified, service as necessary.
Retest to ensure correct operation of the airbag
warning light.
If the connector condition and security are good,
reconnect the connectors and go to step 3.
5.
Connect the PDU to the upper diagnostic socket
and monitorthe airbag warning lamp
signal.
Switch
on the ignition.
If the signal is permanently low, suspect a short
circuit to ground on the airbag warning lamp
control line within the diagnostic module or from
diagnostic module pin
1
-4 to earth. Co to step 4.
If the signal switches low for six seconds after
ignition on but the airbag warning lamp is
permanently illuminated, suspect a fault in the
output side of the instrument pack to the airbag
warning lamp.
Disconnect diagnostic module plug 1 (slate) and
withdraw the plastic locking wedge to prevent
shorts to other circuits. Check continuity from pin
1-1 to ground.
If a short circuit to ground is detected, service the
wiring
as
necessary. Replacethe locking
wedge,
re­
insert the connector. Switch on the ignition and
check that the airbag warning lamp signal atpin 1-
4 goes high six seconds after switching on the
ignition and that the warning lamp extinguishes.
If no short circuitto ground isdetected,thediagnostic
module is faulty. Replace the diagnostic module.
Switch on the ignition and check that the airbag
warning lamp signal at pin
1
-4 goes high six seconds
after switching on the ignition and that the warning
lamp extinguishes.
Switch off the ignition. Disconnect the battery.
Rearm the airbags (6.4.21.4). Switch on the
ign
ition
and check for correct indications from the airbag
warning lamp.
6-84 September 1996