B0370 — SRS Airbag Control Module Fault

Causes

• Faulty or internally damaged airbag control module (ACM)
• Low or intermittent battery voltage/power supply to ACM
• Poor ground connection for ACM
• Corroded, loose or damaged wiring/connectors at the ACM or airbag circuits
• Loss of CAN/diagnostic bus communication with other control modules
• Damaged clock spring, seatbelt pretensioner or airbag squib short/open

Symptoms

• SRS/Airbag warning lamp illuminated or flashing on instrument panel
• Possible seatbelt pretensioner warning or other safety-system lights
• Airbag system disabled or reduced functionality (may be logged in vehicle data)
• Adaptive restraints or seatbelt pretensioners may not arm
• Stored DTC B0370 and possibly related SRS or communication codes

What to check

• Retrieve all SRS and network codes with a capable scan tool and record freeze-frame data.
• Verify battery voltage is within nominal range (engine off and cranking conditions) and inspect battery terminals.
• Inspect ACM connector(s) for corrosion, bent pins, pushed-out terminals or water damage.
• Check for proper ground(s) and power supply at the module connector pins.
• Verify CAN/SRS bus communication — check that the module responds to scan tool queries.
• Inspect airbag circuit wiring to front/rear modules, clock spring, seatbelt pretensioners and squibs for damage or shorts.

Signal parameters

• Module supply voltage: nominal ~12 V (should be stable; falling below ~9–10 V can cause faults).
• Ground continuity: low-ohm connection between ACM ground pin and chassis.
• CAN/SRS bus activity: module should transmit/respond to diagnostic frames when queried by scan tool.
• Airbag squib/pretensioner resistance: typically low-ohm circuits (refer to vehicle spec; open or short conditions indicate wiring or component failure).
• Self-test status: module internal self-check passes (no internal fault flags) when healthy.

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