Pretensioner Squib Leakto Ground - Aston Martin DB7 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
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 0 0 8 0 0 0 0 0 0 0 0 0 0 '
0 0 0 ™ ^ ^ ^ ^ ^
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 w i l l be logged if the resistance of the
pretensioner squib feed or return line to ground
falls below I k f i .
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 0 0 8 o 0 0 0 0 0 0 0 0 0 '
0 0 0
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