B101E

Code

LAND ROVER B — Body

Air Conditioner Switch

Brand: LAND ROVER

Type: B — Body

Views: UK: 18 EN: 31 RU: 23

AI status

Completed

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Page language: EN

Causes

Open or short in the A/C switch wiring or connector
Corroded, loose, or damaged A/C switch connector or terminals
Failed or intermittent A/C switch (mechanical or electrical)
Faulty climate control / body control module input circuit
Water ingress or contamination at switch or connector
Software or CAN/communications fault reporting incorrect state

Symptoms

A/C or climate control not responding correctly to switch input
A/C compressor not engaging when switch is selected
Intermittent operation of A/C or blower controls
Malfunction indicator or message for climate system on dash
No change when pressing A/C switch or inconsistent A/C status

What to check

Scan for additional climate or body control codes and live data
Visual inspection of A/C switch, bezel and connector for damage or moisture
Wiggle test the switch and wiring while observing live data or A/C operation
Check fuse(s) and power/ground feeding the switch and related module
Measure continuity and resistance of switch contacts with multimeter
Check harness for chafed areas, pinched sections, or signs of overheating

Signal parameters

Expected switch signal: two-state (on/off) logic — typical signal reference is either battery voltage when closed and ~0 V when open, or a low-voltage logic level per factory data
Typical closed-circuit resistance: very low (near 0 ohms) across switch contacts; open-circuit = OL
Connector voltage supply: approx. battery voltage (~12 V) on fused feed; verify with key on
Controller input may be a pulled-to-ground or pulled-to-VREF circuit — consult manufacturer wiring diagram for exact levels

Diagnostic algorithm

Retrieve all related DTCs and freeze-frame data; record A/C switch live status in scan tool.
Attempt to reproduce fault: toggle A/C switch while monitoring live input in climate or body control module data.
Perform visual inspection of the switch assembly and adjacent harness for damage, corrosion, or water ingress.
With ignition on, back-probe the switch connector and measure supply, signal and ground voltage while operating the switch. Compare to factory values.
Check switch continuity with multimeter: verify open/closed resistance changes when operated. Replace switch if contacts do not switch reliably.
If switch tests good, disconnect switch and check continuity/resistance between switch connector and control module input pin. Repair any open or high-resistance wiring.
Inspect and clean connector pins; apply dielectric grease after repair if appropriate.
If wiring and switch are good, inspect/bench-test or substitute the climate/body control module input (if serviceable) or check for software updates and communication faults on CAN bus.
Clear the code and retest under normal operating conditions to confirm repair.

Likely causes

Broken wire between switch and control module (chafing, pinched)
Corrosion in switch connector causing intermittent contact
Plastic switch contacts worn or stuck from dirt
Poor ground or battery feed to switch circuit
Connector pushed out or pins bent during prior servicing

Fault status

⚠️ Status

Air conditioner switch circuit fault: signal missing, open or short detected between A/C switch and control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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