B1046

Code

LAND ROVER B — Body

Switch of

Brand: LAND ROVER

Type: B — Body

Views: UK: 27 EN: 31 RU: 19

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Defective or worn switch (contacts not closing)
Open or shorted wiring in the switch circuit
Poor or corroded connector pins or harness damage
Poor ground or battery supply to the circuit
Intermittent contact due to moisture/contamination
Body Control Module (BCM) software glitch or internal fault

Symptoms

Associated function(s) controlled by the switch fail to operate
Intermittent operation or loss of function for that circuit
Related dash indicator or stored fault present
No change when the switch is operated (remains 'off')

What to check

Read freeze frame and full trouble code data with a Land Rover-compatible scan tool
Visually inspect switch, connector, and wiring for damage, corrosion, or moisture
Operate the switch while monitoring live data to see if status changes
Check for related codes that indicate wiring or BCM issues
Verify battery voltage and ground integrity at the switch circuit

Signal parameters

Switch expected states: closed (ON) = continuity to reference (ground or supply), open (OFF) = high resistance/open circuit
Typical voltage at switch terminal: ~0 V (grounded) or battery voltage (~11–14 V) depending on circuit design
Resistance closed: near 0 Ω; resistance open: >>1 MΩ (or OL on meter)
No pulsed/frequency signal expected for a simple on/off switch

Diagnostic algorithm

Use a compatible diagnostic tool to confirm B1046 and note any related codes and freeze frame data.
Identify the specific switch/function associated with the code from manufacturer wiring/repair information.
Visually inspect switch and harness for damage, corrosion, or water ingress; repair as needed.
With ignition on, monitor the switch input in live data while operating the switch; note if the BCM sees the change.
Measure voltage at the switch connector: with switch ON expect supply/reference; with switch OFF expect open or ground per circuit design.
Perform continuity/resistance check from the switch connector to the BCM pin to rule out open circuits.
Wiggle test harness while monitoring live data to find intermittent faults.
If wiring and switch test good, check BCM grounds and power feeds; retest.
If all wiring and switch checks pass, update/reflash BCM software if available and retest; consider BCM replacement only after confirming internal fault.

Likely causes

Broken or chafed wire to the switch (open circuit)
Connector pushed out, corroded, or with bent pins
Switch internal failure (stuck open, dirty contacts)
BCM not reading switch due to internal failure or programming issue

Fault status

⚠️ Status

Switch input reported 'off' (open) by the body control module; circuit not presenting expected ON state.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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LAND ROVER

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