SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS
52Bb-129
CIRCUIT OPERATION
The side impact sensor includes an analog G sensor
and CPU, etc. The CPU monitors the analog G sen-
sor output signal. If the CPU judges that the side-air-
bags should be deployed, it sends a fire signal to the
SRS-ECU to deploy the side-airbags. Besides that,
the CPU diagnoses the internal components of the
side impact sensor. If a malfunction occurs, it
requests the SRS-ECU to set a diagnostic trouble
code.
.
DTC SET CONDITIONS
These DTC are set if communication between the
side impact sensor (LH) and the SRS-ECU is not
possible or communication is faulty.
.
TROUBLESHOOTING HINTS
• Damaged wiring harnesses or connectors
• Malfunction of the side impact sensor (LH)
• Malfunction of the SRS-ECU
.
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
STEP 1. Check the side impact sensor (LH).
(1) Disconnect the negative battery terminal.
(2) Replace the side impact sensor (LH) with the side impact
sensor (RH).
(3) Connect the negative battery terminal.
(4) Erase diagnostic trouble code memory, and then check the
diagnostic trouble code.
Q: Is DTC 89 or 96 set?
YES : Replace the side impact sensor (LH) with a new one.
(Refer to
P.52Ba-42
.) Then go to Step 3.
NO : Go to Step 2.
STEP 2. Check the harness wires for open circuit or short
circuit between SRS-ECU connector E-07 (terminal No.34
and 36) and side impact sensor (LH) connector F-13
(terminal No.1 and 2).
NOTE: After inspecting intermediate connector E-19 inspect
the wiring harness. If the intermediate connector E-19 is dam-
aged, repair or replace it. (Refer to GROUP 00E, Harness Con-
nector Inspection
P.00E-2
.) Then go to Step 3. If harness wires
are in good condition, go to Step 3. If any harness wires
between SRS-ECU connector E-07 and side impact sensor
(LH) connector F-13 are damaged, repair them or install the
sensor cable. Refer to
P.52Ba-42
. Then go to Step 3.
AC204603AC
CONNECTOR: E-19
FLOOR
CONSOLE
E-19
2
1
4
3
E-19