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SRS AIR BAG DIAGNOSIS TSB Revision SUPPLEMENTAL RESTRAINT SYSTEM (SRS) 52B-179 CAUTION If DTC B1C27 is set in the SRS-ECU, always diag- . CIRCUIT OPERATION • The SRS-ECU judges how severe a collision is by detecting signals from the side impact sensor • The ignition signal is input to the side-air bag module to inflate the side-air bag. . DTC SET CONDITIONS This DTC is set if there is abnormal resistance . TROUBLESHOOTING HINTS • Damaged wiring harnesses or connectors • Short to ground in the left hand side-air bag mod- ule (squib) harness • Malfunction of the SRS-ECU DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (M.U.T.-III Sub Assembly) • MB991824: Vehicle 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) • MB991865: Dummy resistor • MB991866: Resister harness AC708951AD Connector: C-36 C-36 (Y) AC708954 AD Connector: D-34 D-34 (Y) |