B1723

Code

LAND ROVER B — Body

Driver seat rear switch - circuit short to battery

Brand: LAND ROVER

Type: B — Body

Views: UK: 15 EN: 27 RU: 18

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Page language: EN

Causes

Short to battery (positive) on driver seat rear switch wiring
Damaged, pinched or chafed harness where conductor contacts battery-positive
Faulty rear seat switch with internal short
Corroded or bridged connector pins
Aftermarket accessories or repairs that connected power to the circuit
Faulty seat control module or internal module short

Symptoms

DTC B1723 stored; possible related seat functions inoperative or erratic
Seat rear adjustment (or related rear seat functions) stuck or non-responsive
Blown fuse(s) on seat power circuits
Intermittent operation that may change with seat position or vibration

What to check

Read/record fault details and freeze frame with a capable scan tool; clear and attempt to re-run to confirm repeatability
Inspect fuses and relays for seat circuits
Visually inspect seat harness, connectors and switch for damage, corrosion or foreign material
Back-probe switch connector and measure voltage relative to chassis ground with ignition ON and switch operated and released
Disconnect switch and observe whether fault clears or changes
Perform wiggle tests on harness while monitoring live data/voltage for intermittent shorts

Signal parameters

Expected: With ignition ON and switch in inactive position: near 0 V (low) or open depending on design
Expected: With switch commanded to supply: approx battery voltage (11–14 V)
Fault condition: permanent battery voltage present when switch should be low (shows ≈11–14 V at rest)
Expected continuity: when switch closed, continuity to seat module/control input; when open, high resistance or open circuit

Diagnostic algorithm

Obtain the vehicle-specific wiring diagram and identify the driver seat rear switch circuit, power feed, ground, fuses and seat control module pins.
Record DTC and live data with a scan tool. Note whether other seat/comfort module codes are present.
Visually inspect switch, connector and harness routing for pinched wires, abrasion at frame contacts or water entry. Repair obvious damage.
Check related fuses and relays; replace any blown fuses and re-test to see if code returns.
With ignition ON, back-probe the switch connector. Measure voltage on the circuit pin relative to chassis ground with the switch released and actuated. A high voltage at rest indicates a short to battery.
Disconnect the switch connector. If the DTC clears or the voltage at the module end is no longer high, the switch or immediate wiring is the likely cause. If voltage remains high at the module connector, the short is upstream toward the battery or inside the module.
If short persists, isolate sections of wiring: unplug intermediate connectors or remove seat control module connector and measure for battery positive at harness pins to locate the short location.
Perform continuity and resistance checks (battery disconnected when doing resistance checks). Check for continuity to battery positive on the suspect circuit with all connectors disconnected to isolate shorted conductor.
If switch is identified as faulty, replace switch and any damaged wiring or connector pins. If harness is damaged, repair with proper OEM-quality crimps, heat shrink, or replace harness section per manual.
If short is internal to seat control module, consider module replacement or professional module repair. After repairs, clear codes and verify functionality and that code does not return.

Likely causes

Wire insulation abrasion at harness routing points (seat frame, door sill)
Connector water ingress or corrosion causing positive bleed
Switch contacts welded/shorted or internal PCB failure
Incorrect repair or splice connecting constant 12V to the switch feed
Short inside seat module or connector pin shorted to battery feed

Fault status

⚠️ Status

Driver seat rear switch circuit short to battery detected — high voltage present on the rear switch circuit when it should be low. Fault stored.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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B1723 — Driver seat rear switch - circuit short to battery