1997 ASTON MARTIN DB7 Instrument

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brake fluid hood release wheel size fog light change wheel width

Page 9 of 421

ASTON MARTIN DB7 1997 Workshop Manual
[Em^^^?
Electrics
Repair Procedures

6.1.01

6.1.02

6.1.03

6.1.04

6.1.05

6.2.01
6.3.01

6.3.02

6.5.01

6.5.02

6.5.03

6.5.04

6.5.05

6.5.06

6.5.07

6.5.08

6.6.01

6.6.02

Page 15 of 421

ASTON MARTIN DB7 1997 Workshop Manual
Em3^^^

Electrics
Ignition Switch / Instrument Panel - Removal Procedures
6.5.03 Ignition Switch 6.5.04 Instrument Panel
Procedure

1.
Disconnect the battery.

2.
Remove three screws and the

Page 28 of 421

ASTON MARTIN DB7 1997 Workshop Manual
Electrics
Electrical Component Location Index •
Component Name
Fuel Filler Flap Solenoid
Fuel Pump 1
Fuel Pump 2
Fuel Tank Sender Unit
Gear Selector Illumination
Gear Shift Interlock Soleno

Electrics
Electrical Component Location Index •
Component Name
Fuel Filler Flap Solenoid
Fuel Pump 1
Fuel Pump 2
Fuel Tank Sender Unit
Gear Selector Illumination
Gear Shift Interlock Solenoid
Gearbox Connector (Auto)
Gearbox ECU
Gearshift Interlock Module
Handbrake Switch
Headlamp Control Module
Head/Side Lamp - LH Front
Head/Side Lamp - RH Front
Heated Front Screen Controller
Heated Front Screen Fuse - 40A
Heated Front Screen
Heated Front Screen
Heated Rear Screen
Heated Washer Jet
Heated Washer Jet
High Level Stop Lamp
Horn - LH
Horn - RH
Idle Speed Control Valve
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
Input Speed Sensor (Auto)
Instrument Panel Illumination Control
Instrument Panel
Interior Light - Rear LH
Interior Light - Rear RH
Key Solenoid
Key-In Warning Switch
Kickdown Switch
Lambda Sensor A
Lambda Sensor B
Logic Earth
Low Coolant Probe
Low Level Sensor
Lumbar Pump
Map Reading Light
Microswitch - Glass Drop LH
Microswitch - Glass Drop RH
Up to 97 MY
Location
Reference
2-1
15-13
15-14
15-12
9-3
13-6
7-11
11-2
13-7
8-8
1-3
14-7
14-12
11-4
11-5
7-10
7-1
9-8
1-11
1-11
9-1
11-6
11-6
3-17
8-7
14-8
14-11
7-2
3-6
3-7
3-8
3-9
3-n
3-12
11-11
2-7
2-6
5-4
5-4
11-10
11-9
8-5
3-18
3-19
9-2
13-5
4-1
9-5
5-1
12-2
12-2
Wiring Diag.
Reference
24-A3
25-A1
25-A2
24-C5
19-D4
21-C4
7-B4
4-B3
21-A2
24-A1
2-A2
1-D2
1-A2
9-A2
9-B2
8-B5
14-B2
24-A2
5-A3
5-B3
24-B2
3-C1
3-81
5-C5
12-D2
1-C1
1-A1
8-D2
5-A2
5-C2
5-A3
5-C2
5-A4
5-C4
7-B2
13-D5
11-C5
24-A2
24-D2
12-B2
12-B2
14-A5
6-B5
6-B5
10-D4
8-C3
3-C1
22-D2
13-C4
17-A2
18-A2
Ini^'

IL-^^'^

Rep.
Op.
Reference

6.9.07.1

2.6.02.1
2.6.02.1
2.6.06.1

6.5.11.1

3.3.01.1

6.6.10.1
6.5.12.1
6.1.10.1
6.1.01.1

6.1.01.2

6.4.09.1

6.4.09.2

6.4.09.3
6.4.09.3

6.6.11.1
6.4.10.1
6.4.10.1
6.6.12.1
6.1.11.1
6.1.11.1

2.2.05.1

6.5.13.1
6.1.03.1
6.1.03.1
6.5.14.1
6.3.04.1
6.3.04.1
6.3.04.1
6.3.04.1
6.3.04.1
6.3.04.1

3.4.02.1

6.5.04.2

6.5.04.1
6.6.02.1
6.6.02.1
6.5.14.1

5.4.01.1

6.3.05.1
6.3.05.1
6.5.15.1

1.7.14.1

6.6.01.1
6.1.13.1
6.1.13.1

W3^y
Notes
Auto only
Auto only
Auto only
Auto only
Auto only
Auto only
Auto only
6-20 May 1996

Page 73 of 421

ASTON MARTIN DB7 1997 Workshop Manual
14 65 86
94 96 97 109 121 l}l 134 136 I3B 145 169 170 171 173 176 207 209 222 226
248
250 255 255
258 324
325
328 330 331
351 355

COLOUR
VfU
UB
BK
RY UW 61 LCB m YR GW UB RN BO S BS NR 6

14 65 86
94 96 97 109 121 l}l 134 136 I3B 145 169 170 171 173 176 207 209 222 226
248
250 255 255
258 324
325
328 330 331
351 355

COLOUR
VfU
UB
BK
RY UW 61 LCB m YR GW UB RN BO S BS NR 6B KU NB OK OS BN NS WS UG G KB Y LG RN YG YU WU
WR

368 OS 369 OU
377 BC
378
BS
380 PG
381
BP
386 GO
387 BW
416 LGG
417
LOW
4IS
LGN
420 LGR
421
LG
422 LGP
423 BS 437 LG
438*
439 W
449WK
461
P
477 BW
478
B
483LGK
484 RIN 486 RN 488 BRO 489 UIN 495 OR 496 OU 500 KB
502
RU 503 BW 5P2
WY
514
RB
516
BLG
517
LCY
520 U
523
RW 524
B
526 BK 527 BK 530
N
533
H
534
N 535
N
541
YR
545 YN
546
YB 547 B
548 RG
549
GR 553 PS 556 BK

AREA
B3-I14 C5
A6
B3-II3
C2 A6 A6 A6 A6 B6 B6 86 86 86 86 86
D3 C2 C3 C3 C3 B3
B6 C2
D3
86 86 66 86
85-121
86 B6
D3
B6
03 03 86 86 CI
84-120 03 C3-1I5
05 05 05
C5
84-119
C5 66 C5 B6 86 B3
82
Be
86 03 02
85-121
C2 C2
86 C6 C6
82-112 C3-II5 83-116
C2 03
B4-II8
B5
C6 C6 C6 C5
84-II7 02 02
C6
C5 B2 82
C6 C6
ce
C2
NO
COLOUR
557 PR 559 Y 567 RN 568 R 569 U
570 U
572
U
574
WK
576
W
584 GR
586 LGO
597
WY
568 WS
593
BW
595 GY 600 GB
603 NR
604
OB
608 0 610
W
613 W
615 eu
616
P
617
PW
618
B
622 KB
629 RK
630 NR 643 GW 646 GR 649 P 655 N 657 W
659 N
660 N 661
N
662 N 665 P 664 WK 668 WO
670 N
671
N
673 N
674 PN 675 N 680 G ESI
N
682
R
687 NY 688 08 690 OW 695 P 699 NU 705
WK
711
RW
713
W
716
PW
717
OU

AREA
C6
ce
85-121
II
A2 A2 A2 02 02 C2 C2 C3 C3 03 D5
C5 C5 C5 05 06 06 06 06 06
AG
AG
AG AG
B6 B6 B6 B6
Be B6 B6 66 66
B6 B6 66
66
ce ce
C6 C6 C6
ce ce
C6
ce
C6
NO coLOuit
PIN
inti 569 U
U Al
570
U
W Al

I H>^ 1

NO COLOUR
Pm
AREA 571
RY U
B5-1I5 572
U
W Al

I M>^ 1

NO COLOUlt
Pl((
577
GR
1
578 GY
2
982 GU
5
583 GN
4

AREA
62 82 62 62
DIAGNOSTICS
SOCKET

1HH41

SHEET
II
AREA
6
<4
«

SPL
116 SPL 117

KEY SOLENOID
r-|

KEY-IN WARNING SWITCH
NO
COLOUR
PIN
iS5EA^
580 PG
I Bl
573 B
2 C6

449 WK
I
461
P 2
226
6N 5
577 GR
4
578 GY
5
6 579 B
7
580 6
581
RW
982 GU 583 GH
NO COLOUF 207
NB
914
R6
96
UW
584 GR 585 SW 176
KU
553 PS 222
OS
209 OK 986 LGO 587 WY
250 WS 489 UIN 484 RIN mm

NN
1 2 5 4 5 6 7 8 9 10 II 12 13 14 15
If

AREA
Al CI Al Al 06 Al Dl Al Al Al Al
Bl CI CI
P
_..
NO COLOUR
PIN
588 WS
U
483 LGK
W
589 LGK
W

AREA
Al CI
Bi
L
120 SPL 121
SPL
119

^VWv-
NO
COLOUR
PIN
AREA"
920
U
A CI
iSM
B C5

DE
ilD
OKD

NO tdliVK t>IN 541
YR
1
599 LGY
2
600 GB
3
601
B 4

AREA
01
84-18
Al
??
INSTRUMENT PACK GREEN
IGNITION SWITCH NO COLOUR
PIN
534
N
1
574 WK
2
575 WY
3
57GW
4

AREA
01 Al
A3-II6
Al

NO COLbUR t>IN 590 BS 591
RY
589 LGK 592
RU
593
GW
586 GO 551
WU
594
6W
253
UG
516
BLG
595 BY 173
66
596 OU 569 OU 597 OS 368 OS

1 2 3 4 9 6 7 8 9 10 II 12 15 14 15
,,.,lf
AREA
C6
B3-II3
C5
62-112
Al 61 Bl
C3-II5
61 01 Al Al
ce
61 C6 61

-2.
4

J
12

CRUISE DISABLE
AND
STOP LIGHT SWITCH

Qli
All
Oil

ID
cm;

ii

[[(Dfl)

IDO
Dlczr'

COLUMN SWITCHOEAR
N6
COLOUt
602 6 527
BK
603 NR 604 NB 998 U 65
UB
605 GW 457 LG 606 GR 422
LOR
607 LC 420 LCP
418
LGH
417
LGW
608 0 416
LGG
609 RW 140
PB

PIN 1 2 3 4 9 6 7
n
9 10 II 12 15 14 19 16 17 18 19

AREA
C6 Dl Al Al 69 Al C6 CI C6 CI
B4-II9
Bl
61
61 Al D6 66
NO
COLOUR
86
eK
97
GY
109
LGB
121
WR
131
YR
134
NT
136
UB
138
RN
140
PB
144
WY
149
BG 169 S
170
BS
171
NR
248 NS 295
G
258 KB
324 Y 325 IG 330 YO 331
YU
355
WR 377 BG
378
BS
423 BS 436 W 439 W 477 BW
478 B
495 OU 496 KB 500 BS 523
RW
924
B
926
BK
533 N 535 N 547 8 548 RC 549 GR
556 BK 557 PR 599 Y 968 R 973 B 579 B 580
6
581
RW
585 SW
590 66
596 OU
597 OS
601 6 602 6
605 GW 606 GR 609 RW
610
W
613
W
615
BU
616
P
617
PW

AREA
Al Al Al Al Al Al Al Al D9
B3-II6
Al Al Al Al
61 61 61 61 Bl Bl Bl 61
Al Al C2 B2 B2 82 C3 D3 05 D5 C9 C5 C5 C5 D5 Bl 81
NO
COLOUR
618
B
622 KB 629
RK 630 NR 654 RN 659 RU 645 GW 646 GR 649 P 655 N 657 W 658 LCY 659 N 660 N 661
N
662 N
G65P
664 WK 667 LG 668 WO 670 N 671
N
673 N
674
PN 675 N
678
WU
680 G 681
N
682 R 685 N 685 N 687 NY 688 OG 690 OW 699 P 699 NU 700 BP 701
RN
704
BP
709
WK 711
RW
715
W
716
PW
717
OU

AREA
61 Bl Bl
81
B9-I2I B2-II2
Bl Bl Bl Bl Bl
B4-II8
81 Bl Bl Bl

B3-II4
61 Bl 61 Bl Bl Bl
B4-II4
CI
CI CI
B4-II7
62-117
CI CI CI CI CI A9-I20 89-121 A5-I20 CI CI CI CI CI

I^:M^'^2?
Wiring Diagram
Model
-
Aston Martin
DB7
Coupe
Harness Title
-
Bulkhead
RHD
-
5

Part No.-837-81307
Revision
-
0
Sheet
12 of 29
-
Up to 97 MY

Page 109 of 421

ASTON MARTIN DB7 1997 Workshop Manual
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)
Do

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

Page 150 of 421

ASTON MARTIN DB7 1997 Workshop Manual
COLUMN SWITCHGEAR NO COLOUR
PIN
670
B
671
BK
572
NR
71
NB
673
U
80
UW
674
GW
615
G
675
GR
676
LOR
677
LC
678
LGP
679 BP 680 LGN 681
LGW
G82
0
683 LOG 139
WU
58
PB
13

COLUMN SWITCHGEAR NO COLOUR
PIN
670
B
671
BK
572
NR
71
NB
673
U
80
UW
674
GW
615
G
675
GR
676
LOR
677
LC
678
LGP
679 BP 680 LGN 681
LGW
G82
0
683 LOG 139
WU
58
PB
137
NU
1 7. 3 1 5 6 7 8 9 10 II 1? 1} 14 15 16 17 18 19 20

AREA
8.B4-67
I0.B2-9:
8.65-70
8.AI 9.A2 S.AI I0.B2-9I 8.C3
8.C2-79
II.B6 IO.BI-89 ILB6
9.83-81
II.B6
ii.Be
II.B4-I2I II.B6 8.CI 8.BI 8.BI
COURTESY LIGHT
ID
NO COLOUR PIN 684
PG
1 685
B
2 686 PW 3 687 P 4
AREA
8.B2-6I
8.B2-G2
9.01
8.B5-7I

SHEET 8 AREA B6
2K2 RESISTOR NO COLOUR PIN 692
U
A 673
U
6
AREA
9.83-83
9.AI 'AAAA-
lOL

ID]
(D

CRUISE DISABLE
8
STOP LAMP SWITCHES

[=r

NO COLOUR
PIN 693 8 I 694 LGY 2 127 YR 3 695
CB
4

AREA
8.B4-67
9.B5-82
8.BI IO.C3-I0I
DRIVERS AIRBAC
NO COLOUR
PIN 696 RP I 2 697
KN
3

AREA
II.C4-I20
NO COLOUR PIN AREA 688 U U
9.C2-76
689
U W
9.C5-86

NO COLOUR
PIN
690 RY
U
691
U W

AREA
9.C2-78
9.C5-86

^=^^1
[^1

SPL
77 SPL 79

I
I
INSTRUMENT PACK GREEN I T ,.
NO COLOUF 268 NB 726 RB 134 UW 727 GR 707 SW 196 KU 729 PS 264 OS 238 OK 752 LOO 733 W¥ 192 WS 325 WS 736 RIN 737 UIN 738 BRD
PIH 1 ? 3 4 5 6 7 8 9 10 II 12 13 14 15 16
AREA
12.
Al lO.CI 8.BI
9.C2-79
9.02 II.CI 1I.C3 I2.AI I2.AI
10.B2-97
9.B5-87
II.CI I2.A2 I0.C5 I0.C5 I2.C5-I03
INSTRUMENT PACK BLACK

-
SPL
83

-SPL
82

-SPL
81

NO COLOUR
PIN
AREA
720
GN
U
9.C4-85 721
OR W
9.C2-79

|F^

SPL
76 SPL 78

P.A.T.S. TRANSCEIVER DIMMER SWITCH

n
n/J D D II 11 II 11 II 11 D D II
1 1
u ul|,
NO COLOUf 739 BS 740 YW
741 GN 742 GW 743 GO 744 WU 745 BW 328 UG 747 BY
191 GB 611 OU 749 OU 610 OS 750 OS
PIN 1 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16
AREA II.B3-I16 IO.B2-92

9.C4-85
I0.B2-9I I2.A5 I2.B2
I0.B2-9'
I2.AI
9.A5-88

ILBI 8.03 I2.DE 8.03 12.06
INSTRUMENT PACK WHITE
D D D D
CB D D D D • D
^
Tl

NO COLOUf 751
WK
752
P

753
GR
754
GY

755
B

756
B
757
RW
758
GU
759
GN
PIN 1
2 3
4
5 6 7 8 9
10 II 12

AREA
8.B5-73
1I.B4-I22
9.C6 9.C6

8.B4-67

8.B2-63
8.B4-68
9.C6 9.C6
DIAGNOSTIC SOCKET
NATURAL BASE

J¥tL
87A 87A

nifl

NO COLOUR
PIN
709
W
1
710
B 2
7H
UW 3
712
OB 4

AREA I2.BI I2.BI
I2BI I2.BI
BLACK BASE
COURTESY HO COLOUR 698 6U 699 P 700
PW

686
PW

LIGHT RELAY PIN AREA 85 I1.B4-I27 86
8.B5-7I
87
8.83-65
87A 30 9.BI
AUX LOAD RELAY NO COLOUR 701 B 702
WK
703
WO

704
N

PIN 85 86 8/ 87A 30

AREA
8.B2-62
9.C2-77
8.B5-72

I0.A2
GEARBOX WARNING NO COLOUR 182
S
706
WK
"
707 SW 708
WK

PIN AREA 85 II.BI 86
8.85-73
87
87A
9.A4
30
8.B5-73

l>°
l>«'
l>»'
ll">'
l>-'
l>='

'
6
NO COLOUR PIN 1 2 3 629
K
4 627 0 5 628 R 6
AREA
8.C5 8.C5 8.C5
NO COLOUR PIN 753
GR
1 754 OY 2 758
GU
3 759
GN
4
AREA 9.B6 9.66 9.B6 9.B6
KEY SOLENOID KEY-IN WARNING SWITCH NO COLOUR PIN AREA
713
YN I 1LC3
714
YB 2
II.C3
NO COLOUR
PIN
AREA 715
PG I 12.A5
716
a 2
8.62-63

GNITION SWITCH NO COLOUR
717 718 84 719
N WK WY W
PIN 1 ? 3 4

AREA I0.A2
9.C2-77
8.AI
8.66-74

"^3? wiring Diagram
Model - Aston Martin DB7
Harness Title - Bulkhead LHD - 2
Part No. - 837-84634
Revision - 0 Sheet 9 of 26 - 97 MY

Page 199 of 421

ASTON MARTIN DB7 1997 Workshop Manual
"^p
Electrics
Airbag System
No Airbag Warning Lamp

I
noperative lamp, lamp ci rcu it or no ign ition voltage
to the diagnostics module
Normal Operation
The airbag warning lamp is designed to

"^p
Electrics
Airbag System
No Airbag Warning Lamp

I
noperative lamp, lamp ci rcu it or no ign ition voltage
to the diagnostics module
Normal Operation
The airbag warning lamp is designed to illuminate
for approximately six seconds when the ignition is
switched
on.
This period
is
allocated for satisfactory
performance of the airbag system self test.
Note: The a irbag warning lamp is
driven
by
the instrument

pack and not directly by the airbag diagnostic module.
The airbag diagnostic module requires an ignition
supply to pin
1
to energise the airbag warning lamp
circuit. If the warning lamp circuit is open, or the
diagnostic module does not receive an ignition
voltageatpini, the warning lamp will not illuminate.
Open circuit in the warning lamp supply, in
conjunction with another system fault, will cause
the diagnostic module to emit five tones every 30
minutes while the ignition is switched on. Repair
the faulty circuit before further diagnosis.
Note:
The
diagnostic module will not emit
the
five tone
signal if the warning lamp
is
open circuit and
there
is no

system
fault.

Possible Causes
Defective airbag warning lamp
Faulty wiring in the airbag warning lamp circuit
Loss of ignition voltage at diagnostic module pin 1.
Loss of ground at diagnostic module pin 3
Instrument pack fault
Fault Analysis
WARNING: Read and adhere to all warnings and
safety procedures at the start of this section when
working on the airbag
systent.

1.
Remove the instrument pack and check the airbag
warning lamp.
If the lamp is good, go to step 2.
If the lamp is defective, replace it, switch on the
ignition and check that the lamp is now on for
approximately six seconds after ignition on.

2.
Disarm the airbag system and fit airbag simulators
(6.4.21.4).
9.
Connect the PDU. Switch on the ignition. Measure
the 12V ignition supply voltage from airbag
diagnostic connector pin
1 -1
{+) to chassis ground.
If ignition voltage is present, go to step 6. If ignition
voltage is not present, go to step 4.
Checkfuse F15passengersidefuseboxRHDorF17
passenger side fusebox LHD (Ignition supply to the
diagnostic module pin
1
-1). If the fuse is good, go
to step 5. If the fuse is replaced, go to step 6.
Check for an open circuit on the YW wire from fuse
F15 passenger sidefusebox(F17 LHD)todiagnostic
module pin 1-1. If continuity is good, isolate the
fault in the 12V supply to fuse Fl 5 (Fl 7) and then
go to step 9.
Measure the voltage from diagnostic module pin
1
-
1 to diagnostic module pin 1-3. If 12V is not
present, isolate and service the open circuit in the
diagnostic module ground to pin 1-3. Then go to
step 7.
Switch the ignition off. Set up to measure the
voltage from DM pin
1
-4 to DM pin
1
-5 during the
first six seconds after ignition on.
Switch on the ignition, the warning light signal to
the instrument pack should switch for six seconds
after a brief delay.
If the signal does not switch, the diagnostic module

is
fau Ity. Replace the modu
le,
switch on the ign ition
and check that the airbag warning lamp does light
for six seconds after ignition on.
If the signal does switch for approx. six seconds
after ignition on, the fault is in the instrument pack
or wiring, go to step 8.
Check continuity of the YW wire from diagnostic
module pin
1
-4 to instrument pack 16 way plug pin

2.

If continuity is good, service the instrument pack
and then retesttoensure correct indication from the
airbag warning lamp at ignition on.
If continuity is defective, service the wire and then
retest to ensure correct indication from the airbag
warning lamp at ignition on.
Disconnect the PDU, and rearm the airbags
(6.4.21.4). Switch on the ignition and check for
correct indications from the airbag warning lamp.
September 1996 6-83

Page 200 of 421

ASTON MARTIN DB7 1997 Workshop Manual
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 desig

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

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