1997 ASTON MARTIN DB7 heater

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Page 131 of 421

ASTON MARTIN DB7 1997 Workshop Manual
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 (R

Page 178 of 421

ASTON MARTIN DB7 1997 Workshop Manual
NO
COLOUR
2173
B

606
NG

EI2
BK

2175
B
603
NK
PIN
1 ? 3 4 5 6
7
8 9 10 II 12

AREA 23.A3
23.86
23X6
23.A3 23.66
RQ

SEAT HEATER
sw NO COLOUt 2166 R eii ou
2176
0
2177
OR

Page 180 of 421

ASTON MARTIN DB7 1997 Workshop Manual
NO
COLOUR
ms 8
909
NG

999
BK

2160
B
995
NK
PIN
1 ? i 4
5
7
S 9 10 tl 12

AREA
A3
86
06
A3 86
RQ

SEAT HEATER

SWITC

NO
COLOUf
2155
R
749
OU
2161
0
2162
OR
2159
B

Page 184 of 421

ASTON MARTIN DB7 1997 Workshop Manual
NO COLOUR
PIN
823
8 1
824
R
2
826 RB
3
825 RO
4

AREA
A5 A5 A5 AS
SEAT HEATER
CUSHION
ELEMENT
NO COLOUR
PIN
2193
e 1
2194
R 2
2195
RB 3
2196
RO 4

AREA 26.A2 26.A2 26.A2 26.

Page 217 of 421

ASTON MARTIN DB7 1997 Workshop Manual
5^^?
Electrics
Seat Belt Pretensioner
The Seat Belt Pretensioner System (where fitted)
Description
The DB7 seat belt pretensioner system operates the drivers seat belt pretensioner in conjunctio

5^^?
Electrics
Seat Belt Pretensioner
The Seat Belt Pretensioner System (where fitted)
Description
The DB7 seat belt pretensioner system operates the drivers seat belt pretensioner in conjunction with the Airbag

system.
The seat belt pretensioner control module is located under the right hand seat, beside the right hand seat
control module.
The pretensioner control module calculates changes in vehicle speed using an input signal from an accelerometer.
When a collision is detected (Rapid reduction in vehicle speed) and the safing sensor in the airbag system is also

activated,
the pretensioner charge
is
fi red usingelectrical energy stored in a capacitor within the pretensioner control
module. Firing of the pretensioner charge applies additional tension to the drivers seat belt.
The airbag and seat belt pretensioner systems share the SRS (Airbag) warning lamp. Any fault detected by the
pretensioner control module is indicated by constant illumination ofthe
SRS
(Airbag) warning lamp. Flashing of the
SRS warning lamp indicates a fault in the airbag system.
Should both systems develop faults, the pretensioner system will permanently illuminate the warning lamp. This
would mask the airbag system warning indication. Therefore, rectify the pretensioner fault and then retest for faults
in the airbag system
The pretensioner control module can log up to 10 diagnostic trouble codes together with a time since each fault was
alerted to the driver. Each
fau It
wi
11
be identified as 'Permanent' or 'Intermittent' on the PDU diagnostic trouble codes

screen.

System Connections
DB7 is fitted with an Autoliv ECS or RC5 Pretensioner Control Module. The Pretensioner Control Module has an 18
pin connector featuring six shorting bridges. The mating halves of the connector may be securely locked using a
double mechanical locking system.
The following pins on the control module connector are used in the Aston Martin seat belt pretensioner system:
Pin 1 Ground
' ' "L Pin 2 Airbag Warning Lamp
Pin 11 Drivers airbag positive
Pin 12 Drivers airbag negative
Pin 14 Serial communications
Pin 15 12 volt positive feed
Case Ground

15.
rrj ^
ooooooooooooooo
16 illn
^
Note: Pins
1
-2, 3 -4, 5 -6, 7 -8,9 -
10
and 11-12
are
shorted
together
by internal shorting links within the connector when
it
is
disconnected.
The
short circuits may
be
temporarily
overcome
for fault analysis
purposes
by inserting
a
suitable non-metallic

cheater
(the
sBfTiG
size
3s
the
p€gs
in the controller connector) into the rectsngul^r hole opposite the relevsnt p3ir of pins.
September 1996 6-101

Page 221 of 421

ASTON MARTIN DB7 1997 Workshop Manual
^^
Electrics
Seat Belt Pretensioner
Diagnostic Trouble Codes
050A Pretensioner squib leak to battery positive
050B Pretensioner squib leak to ground
050C Pretensioner squib high resistance
050

^^
Electrics
Seat Belt Pretensioner
Diagnostic Trouble Codes
050A Pretensioner squib leak to battery positive
050B Pretensioner squib leak to ground
050C Pretensioner squib high resistance
050D Pretensioner squib low resistance
0D13 Capacitor voltage error
0D14 Capacitor capacitance
0D09 Energy reserve sv^^itch
0D1
E
Energy shutdown switch
050E Seatbelt pretensioner switch error
0109 Accelerometer function
01OA Acceleration out of range

01 OB
Accelerometer offset
0209 Safing sensor error
030A Temperature sensor error
060C Warning lamp short circuit
060D Warning lamp open circuit
060E Warning lamp driver error
OAOC Analogue voltage error
0A09 Communications error
090A EEPROM not programmed
0909 EEPROM checksum
OAOA External watchdog error
OAOB External watchdog time out
020A Safing sensor not closed
090C RAM check error
Seat Beit Pretensioner Diagnostics
WARNING: To avoid the possibility of personal
injury caused by accidental deployment of the
pretensioner, disconnect the vehicle battery and
iva/f at least 10 minutes for all voltages to fully
discharge before working on the pretensioner
system. This covers the possibility of the normal
capacitor discharge circuits being inoperative and
failing to discharge the capacitor when instructed
to do
so.

WARNING: Do not make any electrical
measurements on the pretensioner
squib.
Electrical
measurement devices
can
induce sufficient voltage
to cause unintentional firing of the pretensioner
assembly
050 A Pretensioner Squib Leak to Battery
Positive
050A will be logged if the resistance of the
pretensioner squib feed or return line to a positive
potential falls below
1
k£2.
Procedure

1.
Read the warnings given at the start of this
pretensioner diagnostics section.

2.
Connect the PDU to the lower diagnostic socket
and access the pretensioner control module. Verify
that an 050A code is logged and note if the fault is
shown as intermittent. Note any other codes in the
DTC log and then clear all codes.
3. Switch off the ignition and wait at least 10 minutes
for the pretensioner squib firing capacitors to fully
discharge before continuing with this procedure.

4.
Disconnect the pretensioner squib connector at the
rearward harness. Disconnect the pretensioner
control module and temporarily cheat the squib
shorting link.
Note: The control module harness connector has a

shorting
link which short circuits
the
squib
lines together

when the connector is displaced. Carefully insert a

suitable non-metallic cheater to remove the short
circuit
between pins 11 and 12 before continuing with fault
diagnosis.

i"o
o o b 6 o ooooooooo'
I
ooo
Inserr cheater here
September 1996 6-105

Page 222 of 421

ASTON MARTIN DB7 1997 Workshop Manual
Electrics
Seat Belt Pretensioner 5^^?
Switch on the ignition and check for a positive
potential on the squib feed or return lines at the two
pins of the squib harness connector (activating
circu

Electrics
Seat Belt Pretensioner 5^^?
Switch on the ignition and check for a positive
potential on the squib feed or return lines at the two
pins of the squib harness connector (activating
circuits in the rearward harness in turn may assist in
identifyingthe voltage
source).
Ifa positive potential
is detected, switch off and repair the circuit fault.
If no short circuit is detected in the rearward
harness, go to step 6.
With the ignition switched off and the pretensioner
squib disconnected, check the squib harness for
physical damage.
If any damage is detected, replace the complete
pretensioner squib assembly.
If no damage is detected, the fault is possibly in the
pretensioner control module. Replace the control
module.
Remove the cheater from the control module
connector.
'o o 0080 000000000' 000 ™ ^^ ^^^
ir Insert cheater here
Reconnect all components. Switch on the ignition
and test the vehicle to ensure that the problem is

resolved.

050B Pretensioner
Squib
Leakto Ground
050B will be logged if the resistance of the
pretensioner squib feed or return line to ground
falls below
Ikfi.

Procedure

1.
Read the warnings given at the start of this
pretensioner diagnostics section.

2.
Connect the PDU to the lower diagnostic socket
and access the pretensioner control module. Verify
that an 050B code is logged and note if the fault is
shown as intermittent. Note any other codes in the
DTC log and then clear all codes.
3. Switch offthe ignition and wait at least 10 minutes
for the pretensioner squib firing capacitors to fully
discharge before continuing with this procedure.

4.
Disconnect the pretensioner squib connector at the
rearward harness. Disconnect the pretensioner
control module and temporarily cheat the squib
shorting link.
Note: The control module harness connector has a
shorting link which
short
circuits
the squib lines together

when the connector is displaced. Carefully insert a

suitable non-metallic cheater to remove the
short circuit
between pins 11 and 12 before continuing with fault
diagnosis.

'o
o 00 8 o 000000000' 000
Insert cheater here
Check for a short circuit to vehicle ground on the
squib feed or return lines at the two pins of the squib
harness connector. If a short circuit is detected,
switch off and repair the circuit fault.
If no short circuit is detected in the rearward
harness, go to step 6.
With the ignition switched off and the pretensioner
squib disconnected, check the squib harness for
physical damage.
If any damage is detected, replace the complete
pretensioner squib assembly.
If no damage is detected, the fault is possibly in the
pretensioner control module. Replace the control
module.
Remove the cheater from the control module
connector. Reconnect all components. Switch on
the ignition and test the vehicle to ensure that the
problem is resolved.
6-106 September 1996

Page 223 of 421

ASTON MARTIN DB7 1997 Workshop Manual
D=27
Electrics
Seat Belt Pretensioner
050C Pretensioner Squib High Resistance 050D Pretensioner squib low resistance
050C will be logged if the resistance of the
pretensioner squib circuit rises

D=27
Electrics
Seat Belt Pretensioner
050C Pretensioner Squib High Resistance 050D Pretensioner squib low resistance
050C will be logged if the resistance of the
pretensioner squib circuit rises above 4.5 ±0.5C2
050D will be logged if the resistance of the
pretensioner squib circuit falls below 1.4 ±0.4Q
Procedure
Read the warnings given at the start of this
pretensioner diagnostics section.
Connect the PDU to the lower diagnostic socket
and access the pretensioner control module. Verify
that an 050C code is logged and note if the fault is
shown as internnittent. Note any other codes in the
DTC log and then clear ail codes.
Switch off the ignition and wait at least 10 minutes
for the pretensioner squib firing capacitors to fully
discharge before continuing with this procedure.
Disconnect the pretensioner squib connector at the
rearward harness. Disconnect the pretensioner
control module and temporarily cheat the squib
shorting link.
3.
Procedure
Read the warnings given at the start of this
pretensioner diagnostics section.
Connect the PDU to the lower diagnostic socket
and accessthe pretensioner control module. Verify
that an 050D code is logged and note if the fault is
shown as intermittent. Note any other codes in the
DTC log and then clear all codes.
Switch off the ignition and wait at least 10 minutes
for the pretensioner squib firing capacitors to fully
discharge before continuing with this procedure.
Disconnect the pretensioner squib connector atthe
rearward harness. Disconnect the pretensioner
control module and temporarily cheat the squib
shorting link.
Note: The control module harness connector has a
shorting link which
short
circuits the squib
lines together

when the connector is displaced. Carefully insert a
suitable non-metallic
cheater to
remove
the short
circuit
between pins 11 and 12 before continuing with fault
diagnosis.
.j^ 'o o ob bo oooooooo
O O O
iV ^3 ^3 ^3 ^3 ^3 ^
lU Insert cheater here
Check the continuity of the squib feed and return

lines.
If any significant resistance is measured,
service the wiring as necessary.
Also check the condition of the connector pins for
damage or lack of tension and service
as
necessary.
If the circuit resistance is acceptable and the
connector pins are good, go to step 6.
If any defects are identified and serviced, go to step
7.
If the checks in step 4 are good, the high circuit
resistance must be in the pretensioner squib or in
thecontrol module. Replace the pretensioner squib
and reconnect all components.
Clearall logged DTCs from the pretensioner control
module and then test the vehicle.
If the 050C code is logged again, replace the
control module.
Note: The control module harness connector has a
shorting link which
short
circuits the squib
lines together

when the connector is displaced. Carefully insert a
suitable non-metallic
cheater to remove the
short circuit
between pins 11 and 12 before continuing with fault
diagnosis.
Insert cheater here
Check the continuity from the squib feed line to the
squib return line. With the shorting link cheated,
the resistance should be more than lOkQ. If the
resistance is less than 10kQ, service the wiring as
necessary.
Also check the connector pins for any damage
which could cause an unintentional short circuit.
If the checks in step 5 are good, the low circuit
resistance must be in the pretensioner squib or in
thecontrol module. Replace the pretensioner squib
and reconnect all components.
Clearall logged DTCs from the pretensioner control
module and then test the vehicle.
If the 050D code is logged again, replace the
control module.
September 1996 6-107

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