B1D76

Code

LAND ROVER B — Body

Left rollover protection system

Brand: LAND ROVER

Type: B — Body

Views: UK: 8 EN: 16 RU: 10

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Page language: EN

Causes

Poor electrical connection at rollover protection module or left-side sensors/actuators
Damaged wiring harness (open, short to ground, short to battery, or corrosion)
Faulty left rollover sensor or actuator (mechanical/hydraulic/pyrotechnic device)
Rollover protection control module internal fault
Loss of CAN/communication between modules (airbag/BCM/ABS/ESP)
Blown fuse or faulty relay supplying power to the ROPS circuit

Symptoms

Airbag / SRS warning light illuminated; rollover or ROPS warning/message in instrument cluster
Left rollover protection may not deploy or may be disabled
Possible related faults stored for airbags, stability control or communication
Vehicle may refuse to enter certain safety modes until fault cleared/diagnosed

What to check

Read all SRS/airbag and body control module codes and freeze-frame data with a dealer-level scan tool
Visual inspection: left-side rollover hardware, wiring harnesses, connectors and mounting points for damage or water ingress
Check fuses/relays for the ROPS/airbag power supply
Verify battery voltage (stable 12V+) during testing and module wake-up
Check CAN bus health (bus voltages, termination, other modules reporting)
Do not attempt to deploy or physically test pyrotechnic actuators — follow OEM safety procedures

Signal parameters

Module supply: battery voltage present at module supply pins (approx. 11–14 V with engine off/on)
Reference / sensor supply: factory reference (commonly 5 V or specified vehicle reference) present and stable
Ground continuity:
CAN bus idle voltages: approx. 2.5 V on CAN High and CAN Low (verify with service data)
Sensor outputs: rollover/accel/gyroscope outputs reported via module/CAN (refer to service manual for expected mV/V or g outputs)
Squib/actuator resistance (if applicable): consult service data before measuring; many deployment devices require specific handling

Diagnostic algorithm

Connect OEM-level diagnostic tool and read all fault codes in the SRS, ABS/ESP and body modules. Note freeze-frame and related codes.
Inspect left-side rollover hardware, harness, connectors and grounding points for corrosion, damage, water ingress or loose pins.
Verify primary power and ground to the rollover/airbag control module and check relevant fuses/relays. Record voltages.
Check CAN communication: verify module appears on network and compare live data/telemetry for rollover sensor inputs (roll rate, lateral accel, wake/sleep states).
Perform wiring continuity and short tests between the module and left-side sensors/actuators (power, signal, ground). Repair any open/short circuits.
If wiring and connectors are good but the module or sensor shows out-of-range/absent data, consult service procedures for module/sensor replacement or repair. Confirm part numbers and recall/TSB info.
After repair or replacement, clear codes and perform required initialization, calibration or module programming with OEM tool. Re-run diagnostics and road test per service manual.
If intermittent or unexplained communications faults remain, check for software updates, perform full network scan, and escalate to manufacturer-level support if needed.

Likely causes

Connector corrosion or loose connector at left rollover module/sensor
Wiring damage (pinched/chewed/abraded harness on left side)
Faulty left-side rollover sensor/module
CAN bus communication fault between airbag/vehicle dynamic control modules

Fault status

⚠️ Status

Left rollover protection system fault — system may be disabled; service recommended.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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