1997 ASTON MARTIN DB7 fuse box

wiring tires keyless winter tyres spare wheel torque

Page 166 of 421

ASTON MARTIN DB7 1997 Workshop Manual
STOP LAMP
NO COLOUR 807
CB
1097
G
1098
GP

1099
G

RELAY
PIN AREA 85 I4.CI 86 I7.D2 87 I6.B5-I74
87A
30
17X2

REVERSE LAMP RELAY FUEL PUMP RELAY 1

NO COLOUR 803
SLG
1100
W
IIOI
G

STOP LAMP
NO COLOUR 807
CB
1097
G
1098
GP

1099
G

RELAY
PIN AREA 85 I4.CI 86 I7.D2 87 I6.B5-I74
87A
30
17X2

REVERSE LAMP RELAY FUEL PUMP RELAY 1

NO COLOUR 803
SLG
1100
W
IIOI
GN

1102
NP
PIN 85 88
8/
R7A 30
AREA M.CI 17.02 I6.B3-I7I
I6B5-I75
NO COLOUfl 335 OR 1103 KB 1087 UG 337 RN 1104 NP
PIN BS R6 87 R7A 30
AREA I4.CI I7.B3-I79 I6.A5 14.01 17.02
FUEL PUMP RELAY 2
NO COLOUR 336 0 1105 KB 1089 UR 809 YN 1106 NP
PIN AREA 85 I4.CI 86 I7.B3-I79 87 le.AG 87A I4.CI 30 I7.C2
TILT SENSOR RELAY
NO COLOUfl 1109 B 1110 WK
nil BO 1112 B
PIN AREA 85 17.84-183 S6 I7.B4-I82 87 87A I4.B4-I58 30 I7.B4-I83

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12 13
AREA 17.83-180 16.86-177 16.86-177 I7.B3-I8I I7.B3-I80 14.84-155 14.84-155 16.86-177 17.83-180 I6.B6-I77 I7.B3-I8I I7.B3-I8I
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BOOT FUSEBOX HARNESS
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AREA I7.A3 I7.AI I7.AI 16.83-168 I7.C4 I6.B5-I76 I6.C3-I70 17.84-182 I7.B5-I84 I7.A2 16.85-175 I7.A2

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NO COLOUR AREA 1115
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1123
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SYSTEM
PIN 1 ? 3 4 5 6
7 8 9 10
II II 12 13
14 15
16
17 18 19 20 ?l
22 23 24 25 2b

AREA I6.C2 I4.B6 16.84-172 16.86-178 14 .C6 I4.CI 14.06
17.84-182 M.BI I7.B5 I5.B1-163 17.84-183 I6.82-I67A
I4.C4 I4.CI
I5.BI
I4.CI ie.C4 16.81-167 17.85 17.85-184
'^7
Wiring Diagram

Model
- Aston Martin DB7

Harness
Title - Rearward - 4

Part
No. - B37-84642

Revision
- 0
Sheet
17 of 26-97 MY

Page 182 of 421

$ASTON MARTIN DB7 1997 Workshop Manual \L^C=£ NO COLOUR 1106 HP 1099 G 1097 G 1129 NP 1115 NS 1131 RS 113? RG 1134 WK 1136 NS 1100 W 1139 H? 1104 NP PIN 1 2 3 4 5 6 t S 9 10 II 12 13 AREA 2T.a 2?.CI 27.CI 27.01 27.CI 27.CI 27.C$

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 201 of 421

ASTON MARTIN DB7 1997 Workshop Manual
^^?
Electrics
Airbag System
Airbag DM Fault Code 12
Low battery voltage
Normal Operation
The airbag diagnostic module (DM) monitors the
voltage at pin 1-7 which should be equal to the
battery

^^?
Electrics
Airbag System
Airbag DM Fault Code 12
Low battery voltage
Normal Operation
The airbag diagnostic module (DM) monitors the
voltage at pin 1-7 which should be equal to the
battery voltage. If a voltage lower than 9 volts is
detected at pin 1-7, the airbag warning lamp will be
illuminated and fault code 12 will be flashed.
Possible Causes
Drop in battery voltage to DM pin 1-7 caused by:
• Open circuit to pin
1
-7 from the battery
• Short circuit to ground on the battery feed
circuit
• Safing sensor feed shorted to ground
• Safing sensor internal short to ground
• Faulty charge system draining the battery
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.
Complete a battery voltage test as follows:
a) Measure the battery voltage at the battery under
KOEO and KOER conditions.
If the battery voltage is below 10.5 volts during
KOEO or below 12.5 volts during the KOER tests,
service the battery
and
charging system
as
necessary.
Retest for airbag system fau
It
code 12 and go to step
2 if the fault recurs.

2.
Complete a 12 volts supply check at the diagnostic
module:
a) Disarm the airbag system and fit airbag simulators
(6.4.21.4)
b) Disconnect the airbag diagnostic module.
c) Switch on the ignition.
d) Measurethevoltagebetween DM hamessconnector
pin 1-7 (+) and harness connector pin 1-3 (-).
e) If battery voltage is not present, go to step 3.
If battery voltage is present at pin 1-7, renew the
diagnostic module. Rearm and verify the airbag

system.

3. Check the supply fuse as follows:
a) Check fuse F16 in the passenger side fusebox RHD
(or F18 in passenger fusebox LHD).
If the fuse has not blown, check for an open circuit
between battery positive and diagnostic module
connector pin
1
-7.
If the fuse has blown. Renew the fuse and/or repair
the wiring and go to step 4.

4.
Check for a short circuit as follows:
a) Switch off the ignition. With the airbag diagnostic
module disconnected, measure the continuity to
earth from diagnostic module connector pin
1
-7 to

ground.

If no short circuit is detected, go to step 5.
Ifashortto ground isdetected, service the wiring as
necessary. Reconnect the diagnostic module and
retest to ensure that code 12 is cleared.
5. Check for a short circuit to ground on the safing
sensor wiring as follows:
a) Check for a short circuit to ground at diagnostic
module pin 1-9.
b) If a short is detected, disconnect the safing sensor
and repeat the check at diagnostic module pin
1
-9.
If a short is still detected, service the wiring from
diagnostic module pin
1
-9 to safing sensor pin 7.
c) If no short circuit is detected, change the airbag
diagnostic module. Reconnect the diagnostic
module and retest to ensure that code 12 does not
recur.
6. Rearm the airbags (6.4.21.4)
September 1996 6-85

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