B1823

Code

LAND ROVER B — Body

Rear windshield wiper switch time limit

Brand: LAND ROVER

Type: B — Body

Views: UK: 17 EN: 35 RU: 21

AI status

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Page language: EN

Causes

Stuck or shorted rear wiper switch
Corroded, damaged or loose connector at switch or BCM
Short to battery or ground in switch wiring
High resistance/opens in wiring harness
Faulty rear wiper motor or park/limit switch causing extended run
BCM software or internal fault

Symptoms

Rear wiper runs continuously or does not stop when switch released
Rear wiper does not respond or only operates intermittently
DTC B1823 stored and possible related rear wiper faults
Fuse for rear wiper may blow or show signs of overheating
Possible unusual clicking or abnormal wiper motor noise

What to check

Read and record all stored DTCs and freeze frame data with a diagnostic tool
Attempt to reproduce the fault (operate rear wiper/switch while monitoring)
Visual inspection of rear wiper switch, wiring, connectors and rear hatch area for water ingress/corrosion
Check related fuses and power/ground at the rear wiper circuit
Scan for related BCM or body network communication errors

Signal parameters

Switch closed: expected low resistance (10 kΩ)
Control voltage: 0 V (ground) or battery voltage (~11–14 V) depending on circuit design when activated
Wiper motor run current typically 1–6 A during operation (measure with clamp meter)
BCM input should show a stable/expected state change when switch is pressed and release within OEM time limits (no prolonged continuous active state)
Intermittent or constant active signal on the BCM input is indicative of fault

Diagnostic algorithm

Safety: Park vehicle, key off, and follow battery disconnect procedures if required for testing. Use appropriate PPE.
Retrieve trouble codes and live data with a Land Rover-compatible scan tool. Note any related codes (BCM, wiper motor, body network).
Clear the code, then reproduce the complaint by operating the rear wiper switch while monitoring the switch input channel in live data. Observe whether the input remains active beyond normal operation.
Perform a visual inspection of the rear wiper switch and connector for corrosion, water ingress, broken pins, or damage. Wiggle harness while monitoring live data for intermittent changes.
With ignition on, backprobe the switch connector and measure voltage/resistance: confirm correct activation voltage or ground and check continuity to the BCM input. Compare against expected signal parameters.
Inspect wiring from switch to BCM for chafing, pinched sections, or evidence of short to battery/ground. Repair any damaged wiring.
Check the rear wiper motor and park/limit switch: verify motor parking operation and measure motor current. A failed park sensor can make the BCM see a continuous active condition.
If wiring and motor are good, check BCM grounds and power supplies. Perform a module self-test and reflash/update BCM software if an applicable TSB exists.
If switch is mechanically faulty or shows out-of-spec resistance, replace the rear wiper switch. If evidence points to BCM input failure after wiring and switch verified, consider BCM repair or replacement per service instructions.
After repairs, clear codes and verify repair by cycling the wiper through all modes and confirming no reappearance of B1823 in scan tool memory.

Likely causes

Failed rear wiper switch (mechanical contacts stuck or welded)
Corroded connector or poor grounding at rear door/hatch switch
Shorted wiring conductor feeding the switch (constant voltage applied)
Faulty wiper motor park sensor causing BCM to see continuous active input

Fault status

⚠️ Status

Rear wiper switch signal exceeded allowed time limit. Possible stuck switch, wiring fault, motor park sensor issue, or BCM input fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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