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Home / DTC / B2655 — The switch control module and display are faulty

B2655 — The switch control module and display are faulty

Detailed page for trouble code B2655.

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Code

B2655

LAND ROVER B — Body

The switch control module and display are faulty

Brand: LAND ROVER
Type: B — Body
Views: UK: 6 EN: 9 RU: 6
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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

  1. Retrieve all stored DTCs from all modules and note freeze-frame/live data. Attempt to reproduce symptom while monitoring.
  2. 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.
  3. Inspect and secure grounds and connector pins at the module/display. Repair any corrosion, bent pins, or poor contacts.
  4. Verify wiring continuity between module, display and gateway/ECU(s). Perform wiggle test while watching live data/communications for intermittent failures.
  5. Monitor CAN/LIN bus using a diagnostic tool or oscilloscope for expected idle voltages and message traffic. Isolate bus wiring if no communication present.
  6. Clear codes, reinitialise modules if possible, then recheck. If codes return, compare to freeze-frame and signal measurements.
  7. Check for and apply any available software updates or module reprogramming per OEM procedures. Re-code or adapt modules if required after replacement.
  8. 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.
  9. 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

Similar codes

B2654 B2656 B2600 U0100 U0121
Workshop Manuals

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3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

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Defender Years: 1999–2002 Manual in English 7.6 MB
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Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
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  • - Used engine oil precautions
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  • - Wheels and tyres
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

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Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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