B1011

Code

LAND ROVER B — Body

Power output provided by the control module Heated windshield switch rear demisting of the heater

Brand: LAND ROVER

Type: B — Body

Views: UK: 18 EN: 45 RU: 27

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Page language: EN

Causes

Open circuit in output wiring between control module and heated-windshield/rear demist switch
Short to battery or short to ground on the output circuit
Corroded or poorly seated connector at the switch or control module
Faulty heated-windshield / rear demist switch
Faulty control module output driver
Intermittent wiring damage (chafing, pinched, water ingress)

Symptoms

Heated windshield / rear demist function does not work or is intermittent
Switch illumination or feedback behaves abnormally
Related ancillary functions may be inoperative or show warnings
DTC B1011 stored, possibly with other body electrical faults

What to check

Visual inspection of switch, connector and wiring for damage, corrosion, water ingress
Check for other stored DTCs that may point to common supply/ground issues
Verify fuse(s) and relays for the heated windshield / rear demist circuit
Inspect connector pins for bent/pushed out or pushed in terminals

Signal parameters

Supply voltage to switch: battery voltage approx. 11–14 V with ignition on
Expected output continuity: low resistance path (
Open-circuit: infinite/OL resistance between control module output pin and switch output pin
Short-to-ground: near 0 Ω between output pin and chassis ground
Short-to-battery: near 0 Ω between output pin and battery positive

Diagnostic algorithm

Retrieve freeze frame and related DTCs. Note conditions when code set (ignition state, temperature).
Visually inspect switch and harness connectors at the heated-windshield/rear demist switch and at the control module for corrosion, water, damaged insulation and secure pin fitment.
Check fuses and power supply to the switch and control module. Repair any blown fuses and retest.
With connector disconnected, measure supply voltage at the switch power pin with ignition on — should be ~11–14 V. If missing, trace back to fuse/relay/power feed.
Measure resistance/continuity between the control module output pin and the switch output pin. Expect low resistance when circuit closed; open indicates broken wiring. Wiggle wiring to check for intermittent faults.
Check for shorts: with battery disconnected, measure resistance from output pin to ground and to battery positive to detect short circuits. Repair as needed.
If wiring and connectors check good, bench-test or substitute known-good heated-windshield/rear demist switch if available.
If switch substitution does not clear fault, test control module output driver using scope or manufacturer test procedures. Replace or reprogram control module only after confirming module failure.
Clear DTCs and perform functional test of heated windshield / rear demist function and road test to verify repair.

Likely causes

Poor connector contact or corrosion at the heated-windshield/rear demist switch
Open or high-resistance wire in the output circuit
Failed output transistor/driver inside the body control module

Fault status

⚠️ Status

Control module output to heated windshield / rear demist switch circuit fault detected (open/short/intermittent).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-1.5 hours

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