B1554
DTC B1554: SG BY-PASS Circuit MalfunctionDTC SET CONDITIONS
- These DTC are set when a fault is detected in the SRS-ECU. The most likely causes for this code to be set are shown in the table:
TROUBLESHOOTING HINTS
Part 1:
Part 2:
- Malfunction of the SRS-ECU
DIAGNOSIS
Required Special Tool:
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A (Vehicles with CAN communication)
Recheck for diagnostic trouble code.
Check again if the DTC is set.
1. Erase the DTC.
2. Turn the ignition switch to the "ON" position.
3. Check if the DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTCs set?
YES: Replace the SRS-ECU.
NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to How to Cope with Intermittent Malfunction).