SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-291
STEP 2. Using scan tool MB991958, read the audio
diagnostic trouble code
Check if the DTC is set to the audio.
Q: Is the DTC set?
YES : Diagnose the radio and CD player.
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the SRS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace the SRS-ECU.
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to use Troubleshooting/inspection
Service Points
P.00-15
).
DTC U0195: Satellite Radio Tuner CAN Timeout
CAUTION
• If the DTC U0195 is set, be sure to diagnose
the CAN main bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
.
TROUBLE JUDGMENT
If the signal from satellite radio tuner cannot be
received, the SRS-ECU sets the DTC U0195.
.
JUDGMENT CRITERIA
Because of the CAN-B bus circuit malfunction, if
SRS-ECU becomes unable to perform the normal
data transmission, SRS-ECU determines that an
abnormality is present.
.
TROUBLESHOOTING HINTS
• The CAN bus may be defective.
• The satellite radio tuner may be defective.
• The SRS-ECU may be defective.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicles Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A (Vehicles with
CAN communication system)