B1BA1

Code

LAND ROVER B — Body

Reserved

Brand: LAND ROVER

Type: B — Body

Views: UK: 14 EN: 25 RU: 16

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Manufacturer-reserved code—specific root cause not published in generic sources
Intermittent or permanent loss of communication with a body/control module
Low battery voltage or poor battery connection during control module operation
Corroded or loose connectors, damaged harness, or water ingress
Corrupted software/calibration or failed module hardware

Symptoms

One or more vehicle body functions inoperative or intermittent (locks, lights, wipers, HVAC controls)
Malfunction indicator(s) or message(s) related to body systems
Modules not present or not responding when scanned with a diagnostic tool
Multiple related or network communication fault codes stored
Unexpected module reboots or erratic behavior of accessories

What to check

Read full vehicle scan with a JLR-approved diagnostic tool and save freeze-frame/vehicle status
Check for related/preceding U- or B-class codes (communications and module-specific codes)
Verify battery state-of-charge and voltage while key on/engine running
Inspect fuses, fusible links and module power/ground points for corrosion or damage
Visually inspect connectors and wiring to the suspected module for corrosion, moisture, chafing or rodent damage
Confirm module software/calibration level and check for open technical bulletins (TSBs) or manufacturer service notes

Signal parameters

CAN bus: message arbitration IDs for body module, expected periodic message rate (consult factory data)
CAN physical layer voltages: CAN_H and CAN_L differential behaviour (approx. 2.5 V idle; differential ~2 V when active)
Module supply voltage: battery positive at module connector with ignition on (typically ~11–14.5 V)
Ground resistance: low-ohm connection to chassis ground (
LIN/serial signals (if applicable): expected idle levels and wake-up timing per factory documentation

Diagnostic algorithm

Retrieve full system scan and note any accompanying fault codes and freeze-frame data; record conditions when code set.
Check battery condition and charging system; ensure battery voltage is within specification during diagnostics.
Inspect relevant fuses, relays and main power/ground connections for the affected body module(s). Repair any issues found.
Visually inspect wiring harness and connectors at the module for corrosion, water ingress, bent pins or damage; repair as needed.
Using a JLR factory diagnostic tool, attempt to communicate with the indicated module. If the module is not present, trace CAN/LIN network to locate the break or short.
Monitor CAN traffic while exercising related functions; look for missing or repeating messages and error frames.
If communication is present but erratic, check supply and ground while operating the system (voltage drop/wiggle test).
Check for and apply any required software updates or reflash the module per factory procedures; follow exact programming steps to avoid corruption.
If module hardware is confirmed faulty after checks and programming, replace the module and reprogram/configure according to manufacturer instructions.
Clear codes and perform a full system recheck and functional test to confirm repair. Document steps and any replaced components.

Likely causes

Faulty body control module (intermittent hardware fault)
CAN bus or LIN bus communication fault between modules
Poor power/ground to the affected module (fuse, fusible link, ground strap)
Recent software update or programming interrupted/corrupted
Environmental damage (moisture, rodents) to wiring or connectors

Fault status

⚠️ Status

Reserved manufacturer-specific code. Consult Land Rover factory diagnostic documentation (IDS/SDD/partner tools) and technical service information for precise definition and repair procedures.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

Repair manuals

Manual library for LAND ROVER

320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

Your experience will help others

+100 karma for a short comment :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email