B1725

Code

LAND ROVER B — Body

Rear seat switch of the driver - short circuit to the battery

Brand: LAND ROVER

Type: B — Body

Views: UK: 14 EN: 31 RU: 14

AI status

Completed

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Completed 100%

Page language: EN

Causes

Damaged or chafed wiring shorting to a constant +12V feed
Failed rear seat switch with internal short
Water ingress or corrosion in switch or connector creating conductive path to battery
Incorrect aftermarket wiring or modification tied into the circuit
Faulty connector pin (stuck/bridged) or terminal corrosion
Body control module (BCM) input fault (less common)

Symptoms

Rear seat switch (driver) not responding or operates incorrectly
Seat motor runs unexpectedly or remains powered
Parasitic battery drain when vehicle is off
Relevant fuse may blow or show heat damage
DTC B1725 stored and possibly other related body codes

What to check

Read and record freeze frame/data with a diagnostic scan tool; confirm B1725 is active and note any related codes
Visually inspect switch, connector and wiring loom for damage, pin corrosion, signs of water ingress or aftermarket splices
Inspect fuses and relays for the seat circuit for signs of overheating or failure
With ignition off, measure voltage at the switch connector terminals to see if battery +12V is present when switch is not actuated
Perform a continuity/resistance check between switch signal wire and +12V and between signal wire and ground
Disconnect the switch connector and verify whether the fault clears (helps isolate switch vs. wiring/BCM)

Signal parameters

Battery voltage at vehicle: ~12.0–14.5 V (when engine running or charger connected)
Switch signal terminal (expected): ~0 V (or open) when OFF, ~12 V when ON if circuit is +12V-switched
Resistance across switch contacts: very low when closed (~0–2 Ω), very high/open when open (OL or >1 MΩ)
Insulation/ground leakage: >1 MΩ recommended between switch wiring and chassis ground
BCM input pin: should toggle between ~0 V and ~12 V per switch operation; constant ~12 V indicates short to battery

Diagnostic algorithm

Connect a diagnostic scanner, read DTCs and live data. Note whether the switch input shows constant battery voltage.
Visually inspect switch and surrounding area for contaminants, water or damage. Remove trim to access switch and wiring.
With ignition off, disconnect the switch connector. Clear the code and check if B1725 returns with the connector disconnected. If it does not return, suspect switch or wiring downstream of connector.
Probe the switch connector with a multimeter: measure voltage on the switch signal pin with switch in OFF and ON. If ~12 V present with switch OFF, locate short to battery.
If voltage present with connector disconnected, isolate wiring by inspecting harness along routing for chafes where it parallels constant +12V circuits (lights, heated seats, etc.). Use backprobe and wiggle tests while observing voltage.
Perform resistance/continuity checks: with battery disconnected, measure continuity between signal wire and +12V feed; short or low resistance indicates short. Also check continuity to ground if applicable.
If wiring appears intact, bench-test or replace the switch assembly and re-test. If replacing switch cures fault, repair is complete.
If fault persists after replacing switch and repairing visible wiring, suspect BCM input fault; verify wiring and pin voltages at the BCM connector and consult manufacturer wiring diagram before replacing module.
After repairs, clear codes and perform functional test of seat switch and related circuits; re-scan to confirm no recurrence and check for parasitic draw if battery drain was reported.

Likely causes

Wiring harness damage where the switch signal wire contacts a fused constant +12V conductor
Failed/shorted switch assembly
Corroded/contaminated connector causing battery feed on the switch line

Fault status

⚠️ Status

Rear seat driver switch circuit: short to battery detected. BCM senses permanent battery voltage on the switch input when circuit should be open.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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B1725 — Rear seat switch of the driver - short circuit to the battery