B1067

Code

Generic B — Body

Restraint Control Module Internal Fault

Brand: Generic

Type: B — Body

Views: UK: 16 EN: 17 RU: 16

AI status

Completed

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Page language: EN

Causes

Internal RCM hardware failure (processor, memory, solder joints)
Corrupted or failed RCM firmware/software
Loss or intermittent power supply to the RCM
Poor or high-resistance ground at the RCM
Connector corrosion, loose pins or wiring harness damage near the module
Water intrusion, impact damage, or prior improper repairs

Symptoms

SRS/airbag warning lamp illuminated on instrument panel
Possible seatbelt pretensioner or airbag system faults logged
Inability to clear the warning light or DTC returns immediately after clearing
Loss of communication with RCM on diagnostic scanner (no response)
Vehicle fails safety inspection related to SRS faults

What to check

Retrieve all stored DTCs and freeze-frame data with a capable scanner (OEM or SRS-capable tool)
Check for additional SRS or network (CAN) codes that may indicate related faults
Inspect battery state-of-charge and measure vehicle voltage (key on, engine off) — acceptable ~12.4–12.8 V; running ~13.5–14.8 V
Visually inspect RCM connector(s) and wiring for corrosion, bent pins, water entry, rodent damage, or corrosion
Verify good ground(s) at RCM and measure resistance to chassis (should be low,
Check for CAN bus activity and ability to communicate with other modules (use a scan tool to view live CAN frames)

Signal parameters

RCM supply voltage (Key ON): ~11–15 V — stable, no fast drops
Ground resistance to chassis:
RCM CAN bus bit rate and frame activity: normal active traffic vs. silence
Presence/contents of crash event data or internal fault counters (stored in RCM memory)
DTC occurrence count and time since event (freeze frame)
Module firmware/software part number and calibration ID (for comparison with OEM data)

Diagnostic algorithm

Use an OEM-capable diagnostic tool to read and record all SRS/RCM DTCs and freeze-frame data. Note any additional codes on other modules.
Verify battery condition and recharge or connect a stable battery charger if voltage low. Re-run scan after stable voltage reached.
Visually inspect RCM connector, wiring harness and mounting area for damage, corrosion or water. Repair any wiring faults found.
With service manual wiring diagrams, backprobe and verify power and ground at the RCM connector (Key ON). If power or ground absent or intermittent, trace and repair the circuit.
Check CAN bus continuity and communication: confirm other nodes can see the RCM and the RCM responds to the scan tool. If no comms but power/ground are good, suspect internal RCM fault.
If communications are present but DTC indicates internal memory/firmware error, attempt OEM-recommended reflash/reprogram of RCM per factory procedure. Only perform software updates with correct tool and calibration files.
If reprogram fails or internal faults persist after power/ground/wiring verified and reflash attempted, replace the RCM with a properly programmed unit. Follow manufacturer immobilizer/VIN-encoding and SRS pairing procedures as required.
After repair, clear codes, perform required SRS self-tests and full system checks, and confirm SRS lamp extinguishes and no new DTCs return. Record completion and confirm vehicle readiness.
Safety note: Always follow manufacturer SRS safety procedures: disconnect battery and wait specified time before servicing, use recommended tools, and avoid unnecessary handling of airbag components. If unsure, refer to dealer or qualified SRS technician.

Likely causes

Failed RCM unit requiring reflashing or replacement
Battery voltage low or transient event damaged module memory
Corroded connector or bent pin at the RCM harness
Damaged CAN bus wiring causing the module to lose comms
Water ingress or physical damage to the module housing

Fault status

⚠️ Status

Permanent internal fault detected in Restraint Control Module. SRS warning lamp active; module internal diagnostics indicate failure or corrupted memory. Power, ground and communication checks recommended.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.5-3.0 hours

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