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System Operation Check

Supplemental Restraint System (SRS) warning light indicates air bag and seat belt Emergency Tensioning Retractor (ETR) system readiness. Turn ignition on. SRS warning light will come on, and then go out after about 4 seconds (5 seconds on ML320/430/55) indicating system is functioning properly.

If SRS warning light does not come on, comes on while driving, or is on all the time (for crash related faults), there is a system fault.

Some vehicles may be equipped with passenger child safety seat air bag deactivation system (BabySmart). System requires a special child safety seat and a specially designed passenger front seat. When child seat is installed in passenger seat, the front passenger air bag is disabled.

When child seat IS properly installed, AIRBAG OFF indicator light (on center console) will come and stay on when ignition is in ON or RUN position. When child seat is NOT installed and ignition is turned on, AIRBAG OFF indicator light will come on for about 6 seconds and then go out.

NOTE: When the air bag control module is replaced, the SRS warning light will blink or stay on until new module is reprogrammed to match vehicle. Reprogramming is done using the Mercedes-Benz Hand-Held Tester (HHT) factory scan tool.
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