C1981

Code

LAND ROVER C — Chassis

Failure in the driver's seat position switch circuit

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 13 EN: 25 RU: 14

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Page language: EN

Causes

Broken or chafed wiring in the seat harness (often under the seat or through the carpet)
Loose, corroded, or contaminated connector at the seat switch or seat module
Failed seat position switch or potentiometer (mechanical/electrical wear)
Faulty seat control module or related body control module
Blown fuse or poor power/ground to the seat switch circuit
Water ingress or mechanical damage to seat components

Symptoms

Driver seat does not adjust or adjusts only in some directions
Seat memory functions fail or do not store/recall positions
Seat adjustment switches are unresponsive or intermittent
Warning or message on instrument cluster related to seat or memory system
Related system faults (e.g., passenger sensing or airbag/occupant detection messages) in some vehicles

What to check

Read and record all stored codes and freeze-frame with a diagnostic scan tool; clear codes and attempt to re-create the fault
Visually inspect seat wiring harness, connectors, and grommets for chafing, corrosion, damage, or foreign material (especially under the seat and at the seat rail)
Check fuses and relays supplying the seat control module and switches
With connector disconnected, inspect pins for corrosion, bent or backed-out terminals
Wiggle test: move seat while monitoring the fault and the switch signal to reproduce intermittent failure
Check module grounds and supply voltages at the seat control module and at the switch connector

Signal parameters

Supply voltage to seat switch: typically vehicle battery voltage (approx. 10–14 V when key on) — verify against vehicle wiring diagram
Position/sensor signal output: commonly a low-voltage analog signal (0–5 V) or switched ground depending on design — compare to expected range from factory manual
Resistance of a potentiometer-style switch will vary smoothly when adjusted — look for dead spots or open circuit
Intermittent signals or rapid fluctuations when moving the seat indicate wiring or mechanical wear

Diagnostic algorithm

Use a compatible diagnostic scanner to read C1981 and any related codes; record module information and live data for the seat position signal.
Clear codes and attempt to re-create the fault while observing live data (operate switches and move the seat through its full travel).
Perform a careful visual inspection of the seat harness, connectors and seat track area for damage, corrosion or pinched wires. Repair visible damage.
Verify power and ground to the seat switch: with key on, measure supply voltage at the switch connector and good ground continuity to chassis.
Probe the position/signal wire while operating the switch/seat. Confirm the signal changes smoothly and remains within expected voltage or resistance range. Note any open circuit or short to ground/battery.
If wiring and connector tests are good, measure resistance or output of the seat position switch/potentiometer per manufacturer's procedure. Replace the switch if out of spec or erratic.
Check continuity between the switch connector and the seat control module connector. Repair any open or high-resistance circuits found.
If wiring and switch are confirmed good, update/flash or re-calibrate the seat control module if service information recommends; if fault persists, consider replacing the seat control module.
After repairs, clear codes and perform full function test including seat memory learn/calibration procedure where applicable.
Document repairs and verify no recurrence of C1981 in final scan.

Likely causes

Wiring damage at seat rail or connector caused by seat movement
Connector pins corroded or pushed out under seat
Failed position potentiometer inside the seat switch
Open/short to ground or battery on the switch supply or signal wire
Seat control module fault after wiring and switch tests pass

Fault status

⚠️ Status

Driver's seat position switch circuit fault detected — open/short/implausible signal reported by seat control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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C1981 — Failure in the driver's seat position switch circuit