B1087

Code

LAND ROVER B — Body

Busbar LIN A

Brand: LAND ROVER

Type: B — Body

Views: UK: 29 EN: 131 RU: 92

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted LIN wiring (broken conductor, chafing, damaged insulation)
Poor connector contact or corrosion at busbar or module connectors
Failed LIN transceiver or module on the LIN bus
Short to battery or short to ground on the LIN line
Missing or failed pull-up/pull-down resistor or improper termination
Low battery or unstable vehicle supply voltage during diagnosis

Symptoms

One or more body systems controlled via LIN A not responding (windows, mirrors, seat motors, lighting, door modules)
Intermittent operation of features on affected bus
Multiple communication-related DTCs present (LIN/U-network codes)
Warning messages or caution lights related to body systems
No obvious mechanical fault with affected actuators

What to check

Read all stored and pending DTCs and note freeze-frame data and occurrence conditions
Check and record battery voltage (key on and engine off) to ensure stable supply
Visually inspect connectors and wiring at the busbar LIN A point and related modules for corrosion, damage, or water ingress
Check fuses and power/ground circuits for related modules
Measure LIN line voltage at the busbar connector with key ON: idle and during bus activity
Scan for other network codes (U-codes) that can help isolate the segment

Signal parameters

LIN is a single-wire low-speed serial bus (typical baud up to 20 kbps)
Idle/recessive voltage ≈ vehicle battery voltage (≈ 12 V) with small tolerance
Dominant/active pulse ≈ 0–1 V when driven low by a master or slave
Expected waveform: idle high with periodic dominant low frames; check with oscilloscope for clean, repeatable pulses
No more than one driver actively pulling the line low during a frame; presence of constant low or stuck high indicates fault
Typical pull-up resistor to battery present on bus; missing/shorted termination will change voltages and timing

Diagnostic algorithm

Connect a diagnostic scan tool. Read and record all DTCs and network status. Note when the fault set (conditions).
Verify vehicle battery voltage and charging system health. If voltage is low or fluctuating, restore to proper levels before further testing.
Visually inspect the busbar LIN A connector(s) and adjacent harness for corrosion, bent pins, damaged insulation, or evidence of water ingress. Repair as necessary.
With key ON (engine off), measure LIN line voltage at the suspect connector: expect battery voltage idle and pulsed low during activity. If line is stuck low or high, isolate by disconnecting modules one at a time to find the offending device or short.
Use an oscilloscope to verify LIN waveform quality during communication. Look for missing frames, noise, excessive reflections, or flat/stuck line.
Check continuity between modules and the busbar for opens or shorts to ground/battery. Repair damaged wiring or splices.
Inspect and test the pull-up resistor/termination at the bus master location per manufacturer data. Replace if missing or out of spec.
If wiring and connectors are good, suspect a faulty module transceiver. Isolate by disconnecting suspected modules and retest. Replace module only after confirming it is the cause.
After repairs, clear codes and perform functional tests and a road/operation test to confirm the fault does not return.
If intermittent faults persist, protect and secure harness routing, replace corroded connectors, and consider using dielectric grease or service-specific repair kits.

Likely causes

Corroded or loose connector at the busbar LIN A junction
Damaged LIN wiring harness near busbar or in door/seat areas
Failed body control module or local slave module on LIN A
Short to battery caused by pin pushed out of connector
Intermittent contact due to vibration or moisture

Fault status

⚠️ Status

LIN bus fault detected on Busbar LIN A — communication or electrical fault present on the LIN network associated with busbar A.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

Repair manuals

Manual library for LAND ROVER

413

Browse 413 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