B1A52

Code

LAND ROVER B — Body

SRS Airbag Control Module Internal Fault

Brand: LAND ROVER

Type: B — Body

Views: UK: 18 EN: 27 RU: 22

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Page language: EN

Causes

Internal airbag control module hardware failure (processor, memory, internal power supply)
Corrupted or failed module software/firmware
Intermittent or low supply voltage to the SRS module
Poor ground or connector/cable corrosion at the module
Water ingress or physical damage to the module (previous crash or exposure)
Loss of CAN/serial communication to other restraint or vehicle modules

Symptoms

SRS/Airbag warning light illuminated or flashing on dash
Supplemental restraint systems (airbags, pretensioners) disabled or flagged as inoperative
Fault codes stored in airbag control module
Intermittent or permanent loss of SRS module communication on diagnostic scanner
Possible failure to pass safety/inspection checks

What to check

Read and record all stored SRS codes and freeze frame data with a capable scanner
Verify battery state-of-charge and charging system voltage (with ignition on ~11–14 V typical)
Check for loss of CAN or databus communication to the SRS module
Visually inspect SRS module connectors for corrosion, bent pins, moisture or damage
Inspect wiring harness for physical damage, rubbing, or previous repair splices near module
Check vehicle history for prior airbag deployment or module replacement

Signal parameters

SRS module supply voltage: stable ~11–14 V with ignition ON (voltage dips or spikes are abnormal)
Chassis ground continuity to module: near 0 Ω (no high resistance)
CAN/databus: module should transmit periodic status messages; absence indicates comms fault
Internal module self-test flags / error counters as reported by diagnostic tool
Squib circuit resistance/status: shows open, short, or within expected range (measure only after SRS safety precautions)

Diagnostic algorithm

Capture all SRS codes and freeze-frame data using a manufacturer-capable scan tool and save the session.
Check battery voltage and charging system; ensure stable supply. Recharge or replace battery if low and re-test.
Visually inspect the SRS module area and connectors for corrosion, water ingress, loose pins or damage.
Verify good ground and power at the module connector with ignition ON. Repair any wiring faults.
Confirm CAN/bus communications: check for other modules on the same bus and attempt communication. Repair bus faults if present.
If wiring, power and communications are confirmed good, attempt a module software/firmware reflash or reinitialisation only with approved manufacturer tools.
If reflash/initialisation fails or the module still reports internal errors, replace the SRS control module with a correct OEM unit and program/configure per manufacturer procedure.
After any repair or replacement, clear codes and carry out SRS system self-tests and any required calibrations (steering angle/clock spring, seat/occupant sensors) per manufacturer instructions.
If replacement is performed, ensure the new module is coded/programmed to vehicle VIN and options; verify all restraints function and no new codes are present.
Safety note: follow vehicle manufacturer SRS disabling and grounding procedures before performing any tests on airbag circuits or disconnecting connectors; improper handling can cause accidental deployment and injury.

Likely causes

Failed internal electronics or corrupted firmware inside the SRS control module
Battery/ignition supply or ground problem to the SRS module (voltage spikes, low voltage)
Damaged/corroded connector or wiring harness at the SRS module
Module compromised by water or impact (prior crash/repair)

Fault status

⚠️ Status

SRS Airbag Control Module — Internal fault detected. Module self-test failure; internal hardware or memory error. Communication or deployment functions may be inhibited.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.5-4.0 hours

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