Diagnostic Trouble Codes; Seat Beit Pretensioner Diagnostics; Pretensioner Squib Leak To Battery Positive - Aston Martin DB7 Workshop Manual

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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 w i l l 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 o o o o o o o o o '
I o o o
Inserr cheater here
September 1996
6-105