B1B59

Code

LAND ROVER B — Body

rear Excessive continuous operation of the engine

Brand: LAND ROVER

Type: B — Body

Views: UK: 15 EN: 28 RU: 12

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Page language: EN

Causes

Stuck or welded relay in the rear circuit
Short to permanent battery supply (short to B+) on the rear component feed
Failed or stuck mechanical actuator/motor (rear blower, wiper motor, heater element, etc.)
Faulty or contaminated switch sending continuous ON command
Poor ground or open return causing incorrect sensing
Body Control Module (BCM) or rear control module internal fault or software issue

Symptoms

A rear-mounted component runs continuously (even with ignition OFF or switch OFF)
Battery drain / premature battery discharge
Inability to turn the component off from the cabin controls
Blown fuse(s) repeatedly on the rear circuit
Unusual noise from rear area (motor or actuator running)
Related fault warnings or messages on the instrument cluster

What to check

Connect a compatible diagnostic scanner and read all related DTCs and freeze frame data
Attempt to replicate the continuous operation condition with key on and off
Visually inspect rear area connectors, wiring harness and components for corrosion, damage or water ingress
Check fuses and relays for the rear circuit; inspect relay contacts for welding
Measure voltage at the component power feed and at the relay/connector with the fault present
Measure current draw of the component with an ammeter to verify continuous operation

Signal parameters

Battery voltage on power feed: ~12.0–14.5 V when ON; present when OFF indicates short to B+
Command output from BCM/rear module: switched power (0 V/13 V) or PWM signal depending on system
Switch input signal: expected change when switch toggled (open/closed or digital state change)
Component current draw: typical motor or heater-specific current (measure against spec) — continuous high current indicates stuck device
Ground resistance: low resistance to chassis ground (

Diagnostic algorithm

Read and record B1B59 and any associated codes; clear codes and attempt to re-create the fault to confirm persistence.
With ignition ON and/or OFF as appropriate, verify which rear component is running and note behavior (runs with key off, only with key on, runs only after certain inputs).
Visually inspect rear wiring harnesses, connectors and components for obvious damage or corrosion; repair any found.
Locate and inspect fuses and relays for the rear circuit. Swap the relay with a known-good identical relay and re-test.
Measure voltage at the component feed and at the relay output. If voltage present with relay de-energized or ignition OFF, suspect short to B+ or welded relay.
Disconnect the rear component connector while monitoring current/voltage. If the component stops running when disconnected, test the component separately for internal short or mechanical seizure.
If the component is not the cause, trace wiring for short to battery using back-probing and isolation techniques (remove fuses, disconnect connectors progressively to locate short).
Check BCM/rear module outputs with a scope or multimeter while commanding the component on/off from a scan tool. If BCM is commanding OFF but output is still powered, suspect module hardware fault.
If wiring and component check good and BCM appears faulty, consult manufacturer service procedures for module replacement or software reflash before replacement.
After repair, clear codes and verify normal operation and that B1B59 does not return. Record findings and repairs.

Likely causes

Stuck relay or welded contacts applying constant power to the rear component
Short to battery on the component power feed
Faulty rear control module output transistor or software error
Failed switch or stuck mechanical component that draws/currently conducts continuously

Fault status

⚠️ Status

B1B59 — Rear subsystem detected excessive continuous operation. The rear circuit/component is running continuously when it should not. Possible causes include stuck relay, short to battery, failed component, wiring fault, or control module error.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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