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Home / DTC / B1964 — Transmission of high-end front / rear seat seat unit

B1964 — Transmission of high-end front / rear seat seat unit

Detailed page for trouble code B1964.

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Code

B1964

LAND ROVER B — Body

Transmission of high-end front / rear seat seat unit

Brand: LAND ROVER
Type: B — Body
Views: UK: 9 EN: 14 RU: 9
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Page language: EN

Causes

  • Broken, chafed or corroded wiring or connectors in seat harness
  • Poor power supply or ground to the seat control unit
  • Faulty seat control module (front or rear)
  • CAN / LIN bus fault (open, short, missing termination, high resistance)
  • Software mismatch, incomplete programming or corrupted module firmware
  • Intermittent connector contact (moisture, bent pins)

Symptoms

  • Seat functions partially or completely inoperative (adjustment, memory, heating, ventilation, massage)
  • Seat-related warning lamp or message on instrument cluster or infotainment
  • Other modules report related seat communication errors
  • Intermittent operation or loss of certain seat features
  • Unresponsive seat controls or incorrect seat position reporting

What to check

  • Read all stored and pending DTCs from all modules—note related communication codes
  • Check for manufacturer technical service bulletins or software updates for seat control modules
  • Visually inspect seat wiring, connectors and module for corrosion, water ingress or damaged insulation
  • Verify fuses and relays for seat power circuits
  • Confirm seat module is present and visible on the vehicle network with a diagnostic tool
  • Measure module supply voltage at the connector (should be ~11–14 V with ignition on)

Signal parameters

  • Seat module supply voltage: ~11–14 V with ignition on (nominal 12 V system)
  • Module ground: low resistance to chassis (
  • CAN bus idle voltages: CANH ≈ 2.5 V, CANL ≈ 2.5 V (recessive); differential ~0 V when idle, dominant state moves CANH higher and CANL lower (approx. CANH ~3.5 V, CANL ~1.5 V)
  • LIN bus (if used): 0–12 V pulsed communication; idle at battery voltage via pull‑up
  • Message frequency and IDs: verify expected seat module messages appear on the bus with scan tool (manufacturer-specific IDs and rates)

Diagnostic algorithm

  1. Use a good-quality diagnostic tool to read full DTC lists from all modules; record freeze frame and snapshot data.
  2. Check for related network codes (CAN/LIN) and other seat module codes. Clear codes and re-run test to confirm repeatability.
  3. Inspect connectors at the seat module and under‑seat area for corrosion, bent pins, water ingress and secure locking.
  4. Verify battery voltage at module connector with ignition on and engine off; check ground continuity to chassis.
  5. With an oscilloscope or high-quality multimeter, probe CANH/CANL (or LIN) at the seat module while operating seat controls—verify correct idle voltages and message activity. Look for noise, missing messages or bus shorts.
  6. Perform wiggle test on harness and connectors while monitoring network traffic and DTCs for intermittent faults.
  7. If wiring and network are good, try software/firmware reflash or module initialization per manufacturer procedure.
  8. If fault persists and all wiring and power/ground are confirmed good, consider replacing the seat control module. Reprogram/configure replacement module as required.
  9. After repair, clear codes and verify restoration of seat functions and no recurrence of B1964 under normal operating conditions.

Likely causes

  • Open/short or intermittent wiring in seat harness or network bus
  • Corroded or loose connector at the seat control unit
  • Seat control module internal failure
  • Loss of module supply voltage or poor ground
  • CAN/LIN bus termination problem or a short to battery/ground on the bus
  • Missing or incompatible software calibration for the seat module

Fault status

⚠️ Status
B1964 — Seat control unit communication/transmission fault detected for high‑end front/rear seat. Check wiring, power/ground, network bus and seat module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1960 B1961 B1962 B1963 B1965 B1966
160

Browse 160 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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