SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-259
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Go to Step 3 .
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction
P.00-15
).
STEP 3. Check SRS-ECU connector C-27 and driver’s seat
belt pre-tensioner connector D-121. (Using scan tool
MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) While pushing the part "A" indicated in the figure of the
harness side connector, turn the lock lever to the direction
of the arrow to release the lock lever, and disconnect the
C-27 SRS-ECU connector. Then connect the connector.
(3) After disconnecting the D-121 harness side connectors,
connect the connectors again. For the D-121 connector
disconnection, use a flat-tipped screwdriver to unlock the
locking button at the harness side connector by withdrawing
it toward you in two stages, and then disconnect the
connector.
(4) Connector the negative battery terminal.
(5) Erase the diagnostic trouble code memory, and check the
diagnostic trouble code.
Q: Is DTC B1C3B set?
YES : Go to Step 4.
NO : The procedure is complete. It is assumed that DTC
B1C3B set because connector C-27 or D-121 was
engaged improperly.
ZC501967
AC404789
AC701411AB
MB991824
MB991827
MB991910
Data link
connector
AC507645
A
AC
Lock lever
AC507550AE
Seat belt
pre-tensioner
Harness side
connector
Locking
button
Flat-tipped
screwdriver