Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 539

52B-8
CONNECTOR FOR SRS AIR BAG
The SRS air bag system connector is yellow or red.
To enhance system reliability, a connector lock switch is adopted for the SRS-ECU connector, and each
air bag module and clock spring connector, each seat belt with pre-tensioner <the connector A in the
following illustration (black)>).
SRS-ECU
SQUIB CIRCUIT CONNECTOR LOCK SWITCH
Mechanism to automatically short-circuit the power supply terminal and the earth terminal of the air bag squib
circuit when the connector is disconnected. The short spring inside the connector allows to short-circuit the
power supply terminal and the earth terminal of the squib (no difference in voltage occurs between the
terminals) to prevent the squib from getting charged with static electricity.
CAUTION
When the connector is disconnected, it is normal for short-circuiting to occur between the connector
terminals.
When connector is connected
Squib
<Connector lock switch structure (Example: SRS-ECU connector)>
ECU side connector
Terminal
(Male)
Partition panel
Section A - A
Terminal
(Male)
Partition
panel
SRS -
A
Clock
spring
A
OFF
ON
SRS-ECU
OFF
ON
Harness side connector
A
Terminal
(Female)
Short spring
A
Section B - B
Terminal
(Female)
Short spring
Troubleshooting
Driver's seat belt pre-tensioner
A
Driver's air bag module
Front passenger's air bag module
A
Front passenger's seat belt pre-tensioner
When connector is disconnected
Squib
B
Terminal
B
(Male)
Partition panel
OFF
ON
SRS-ECU
OFF
ON
When connector is connected
Short spring
Terminal
(Female)