B1A98

Code

LAND ROVER B — Body

Local interconnection network bus circuit 1

Brand: LAND ROVER

Type: B — Body

Views: UK: 23 EN: 42 RU: 22

AI status

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Page language: EN

Causes

Open or short in the local interconnection (LIN/CAN) wiring harness
Damaged or corroded connector or pins at a module or junction
Failed or electrically noisy module driving the bus
Improper termination or missing termination resistor (CAN)
Water ingress or mechanical damage to harness or connector
Software/configuration error, module programming mismatch

Symptoms

Warning lamp(s) on dashboard or stored multiple communication DTCs
Loss or intermittent operation of features controlled on that local bus (e.g. mirrors, seats, door modules, HVAC functions)
Certain modules not responding to diagnostics or scan tool
Random or multiple unrelated module errors that clear/reappear

What to check

Read and record all stored DTCs and freeze-frame data from all modules with a capable scan tool
Identify which modules report communication loss or errors on the same bus
Visually inspect wiring harnesses, junctions and connectors for corrosion, damage or water ingress
Check battery voltage and grounds for the affected modules and bus master
Measure bus signal with a multimeter and/or oscilloscope at suspect module connectors
Check termination resistance across CAN high to CAN low (should be ~60 Ω total)

Signal parameters

LIN (single-wire) typical idle: near battery voltage (approx. VBATT). Dominant: pulled low toward 0 V by master.
CAN (differential) typical recessive: ~2.5 V on each CAN_H and CAN_L. Dominant: CAN_H rises and CAN_L falls (differential ~1.5 V).
CAN termination: approx. 60 Ω measured between CAN_H and CAN_L with power off (two 120 Ω resistors in parallel).
Look for clean waveform edges and consistent bit timing on oscilloscope; noise, repeated spikes or flat line indicates wiring or module failure.

Diagnostic algorithm

Connect a manufacturer-capable scan tool; record B1A98 and any other network/communication codes. Note which modules show comms loss.
Confirm whether the fault is present in key-on and engine-running states and whether it is intermittent or permanent.
Visually inspect connectors, harnesses and nearby areas for corrosion, moisture, or physical damage; repair any obvious defects.
Verify supply voltage and ground at the bus master and affected modules (compare to known-good values).
Backprobe the bus at the affected module connector and observe the signal with a meter/oscilloscope. Compare waveforms/voltages to expected signal_params and manufacturer references.
Measure termination resistance on CAN segments (vehicle off) and check for unexpected shorts to chassis or battery.
If a module is suspected, disconnect it (one at a time) and re-check the bus to see if the fault clears; this isolates a misbehaving node.
If wiring is damaged, repair (splice with proper solder/joints or replace harness) and replace corroded connectors. Replace faulty module(s) if confirmed.
After repair, clear codes and perform functional tests and a road test to confirm communications are restored and no further faults set.
If fault persists and wiring checks out, consult manufacturer wiring diagrams and software/reprogramming bulletins; perform module reprogramming if recommended.

Likely causes

Connector corrosion or bent pins at a module on the local bus
Frayed harness chafe shorting to ground or battery voltage
Failed slave module pulling the bus to an incorrect level
Missing/failed termination resistor in a CAN segment
Low or intermittent supply/ground to the bus master (controller)

Fault status

⚠️ Status

Local interconnection network bus circuit 1 - communication fault detected on local vehicle bus. One or more modules may not be communicating correctly.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

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