B2655

Code

LAND ROVER B — Body

The switch control module and display are faulty

Brand: LAND ROVER

Type: B — Body

Views: UK: 14 EN: 26 RU: 18

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Page language: EN

Causes

Blown fuse or poor power supply to the switch control module/display
Poor ground or corroded connector(s)
Intermittent or open wiring between module and display
Internal failure of the switch control module or display unit
Faults on vehicle communication buses (CAN/LIN) or lost communication
Incorrect software calibration, corrupted module software or missing coding

Symptoms

Switches on the affected panel non-responsive or intermittent
Module display blank, frozen, flickering or showing errors
Malfunction indicator or message on dash regarding switch/display
Related functions (lights, windows, mirrors, etc.) may not operate
DTC stored in control modules and possible loss of communication with other modules

What to check

Scan all control modules for stored and pending codes; record freeze frame/live data
Inspect relevant fuses and relays for continuity and correct ratings
Visually inspect connectors and wiring harness for corrosion, damage, or pin push-out
Check battery voltage (key on and cranking) and module power/ground circuits
Verify CAN/LIN communication on the module connectors with a scope or scan tool
Check for applicable Technical Service Bulletins (TSBs) or software updates

Signal parameters

Battery voltage at module: nominal 12–14.5 V (key on), no excessive voltage drop
Module ground resistance:
CAN High/CAN Low idle voltages: approx. 2.5 V on each line; differential ~0 V (with bus idle the lines sit near 2.5 V)
CAN bus activity: message traffic present when system awake
LIN bus idle level: per vehicle specification (typically near battery or ground depending on implementation)
Switch input signals: toggle/change on actuation observable on scope or scan data

Diagnostic algorithm

Retrieve all stored DTCs from all modules and note freeze-frame/live data. Attempt to reproduce symptom while monitoring.
Check battery state and main power fuses. Verify stable supply voltage to the switch control module and display connector with key on and during operation.
Inspect and secure grounds and connector pins at the module/display. Repair any corrosion, bent pins, or poor contacts.
Verify wiring continuity between module, display and gateway/ECU(s). Perform wiggle test while watching live data/communications for intermittent failures.
Monitor CAN/LIN bus using a diagnostic tool or oscilloscope for expected idle voltages and message traffic. Isolate bus wiring if no communication present.
Clear codes, reinitialise modules if possible, then recheck. If codes return, compare to freeze-frame and signal measurements.
Check for and apply any available software updates or module reprogramming per OEM procedures. Re-code or adapt modules if required after replacement.
If wiring, power and communications are confirmed good and software is current, consider replacing the faulty switch control module or display assembly and program new unit per manufacturer instructions.
After repairs, clear codes and perform full system test to confirm repair and that no related faults remain.

Likely causes

Power/ground fault at the switch control module/display (fuse, connector, wiring)
Loss of communication on CAN/LIN between module and instrument/display
Internal module or display electronics fault requiring replacement or reflash

Fault status

⚠️ Status

B2655 — Switch Control Module / Display Fault: power, communication, or internal failure detected

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

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Repair manuals

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346

Browse 346 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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