B1314

Code

LAND ROVER B — Body

Battery saving relay coil - open circuit

Brand: LAND ROVER

Type: B — Body

Views: UK: 19 EN: 26 RU: 16

AI status

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Page language: EN

Causes

Failed battery saving relay (open coil)
Broken or disconnected wiring in the relay coil circuit
Corroded or loose relay connector/pins
Blown fuse supplying the relay/BCM
Poor ground at the relay or BCM
Faulty Body Control Module (BCM) or driver output

Symptoms

Battery saving/isolation function will not operate
Battery may not be isolated when vehicle is off (possible parasitic drain)
Battery warning or body electrical system warning lamp/message
Certain accessory circuits not powered or behaving erratically
Stored DTC(s) related to body/BCM circuits

What to check

Read and record all stored codes and freeze frame data with a diagnostic scanner
Visual inspection of relay, connector, wiring harness and fuses for damage or corrosion
Check battery voltage and health before and during diagnosis
Verify fuse(s) supplying relay/BCM are intact
Backprobe relay coil pins and measure for control voltage when BCM commands relay
Measure coil resistance with relay disconnected

Signal parameters

Expected coil voltage at relay when commanded: ~12 V (battery voltage level)
Coil resistance (typical range): approx. 20–120 ohms (varies by relay design)
Coil current when energized: roughly 0.1–0.6 A (dependent on coil resistance)
No continuity (open) between coil terminals indicates an open coil

Diagnostic algorithm

Connect a diagnostic scanner, record B1314 and any other codes, then clear codes and attempt to re-create.
Visually inspect the battery saving relay, its socket, wiring and related fuses for damage, corrosion or loose connections.
Verify the fuse(s) that feed the relay and BCM. Replace any blown fuses and retest.
With ignition off, disconnect the relay and measure coil resistance across the coil pins. An open (infinite) reading indicates a failed relay.
With the relay disconnected, check continuity between the BCM/relay driver pin and the relay socket pin. Repair any open wiring or poor connections.
With a backprobe and an assistant, command the battery saving function via scanner and measure voltage at the relay coil supply and driver pin. Confirm ~12 V on supply and driver output when commanded.
If supply and driver signals are present but relay coil is open, replace the relay and retest.
If driver output is absent or intermittent, inspect ground(s) and wiring; if wiring is good, consider BCM driver fault and consult manufacturer procedures before replacing BCM.
After repairs, clear codes and verify proper operation over key cycles and after vehicle shutdown to confirm no recurrence.

Likely causes

Failed relay
Open or damaged wire between BCM and relay coil
Corroded/loose connector on relay
Blown fuse or fusible link
BCM output fault (less common)

Fault status

⚠️ Status

Battery saving relay coil - open circuit detected. Relay may fail to energize; inspect relay, connectors, wiring, fuses and BCM driver output.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Repair manuals

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B1314 — Battery saving relay coil - open circuit