Mitsubishi Galant. Manual - part 602
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM(SRS)
52B-49
CIRCUIT OPERATION
•
The SRS-ECU judges how severe a collision is
by detecting signals from the side impact sensor
and the analog G-sensor. If the impact is over a
predetermined level, the SRS-ECU outputs an
ignition signal. At this time, if the safing G-sensor
is on, the SRS air bag will inflate.
DTC SET CONDITIONS
•
This DTC is output if a poor connection at the
SRS-ECU is detected. However, if the vehicle
condition returns to normal, DTC number 34 will
be automatically erased, and the SRS warning
light will go out.
TROUBLESHOOTING HINTS
•
Damaged connectors
•
Malfunction of the side air bag module (LH)
(squib)
•
Malfunction of the SRS-ECU
DIAGNOSIS
Required Special Tools:
•
MB991502: Scan Tool (MUT-II)
•
MB991223 (MB991222): Harness set (Probe)
STEP 1. Check the side impact sensor (LH) line at the SRS-
ECU connector C-45 by backprobing.
(1)Do disconnect the side impact sensor (LH) connector D-20.
(2)Connect the negative battery terminal.
(3)Turn the ignition switch to "ON" position.
(4)Measure the voltage between terminal 1 and the ground by
backprobing.
•
Voltage should be 9 volts or more
(5)Check the continuity between terminal 3 and the ground by
backprobing.
•
Should be less than 2 ohm.
Q: Does the voltage meet the specifications or is the
resistance less than 2 ohm?
YES : Replace the side impact sensor (LH). Refer to
NO : Go to Step 2.
AC003696AB
D-20 CONNECTOR
HARNESS SIDE VIEW
AC003697AB
D-20 CONNECTOR
HARNESS SIDE VIEW