B1826

Code

Other B — Body

Wiper Rear High Limit Input Circuit Failure

Brand: Other

Type: B — Body

Views: UK: 27 EN: 37 RU: 33

AI status

Completed

ready

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Page language: EN

Causes

Open or short in rear wiper high-limit switch wiring
Corroded or loose connector at rear wiper motor/switch
Faulty high-limit switch inside the rear wiper motor assembly
Faulty rear wiper motor or integrated park/switch module
Poor ground or battery supply to the wiper motor/control module
Water intrusion or corrosion in connector or motor assembly

Symptoms

Rear wiper does not park correctly (stops in wrong position)
Rear wiper intermittently fails or does not move
Rear wiper sweeps beyond expected stop or stalls
DTC stored in body/control module; possible warning/message in vehicle
Erratic rear wiper behavior or inability to complete a park cycle

What to check

Read and record freeze frame/related codes and data with a scan tool
Visually inspect fuse(s) for rear wiper motor and related wiring
Inspect connector at rear wiper motor for corrosion, bent pins, or water entry
Operate rear wiper while observing connector/motor for obvious faults
Check for TSBs or software updates affecting rear wiper park/high-limit logic

Signal parameters

Expected: a discrete switch-type signal that changes state when the wiper reaches the high-limit (park) position
Voltage: signal typically changes between ~0 V (ground) and vehicle battery voltage (~12 V) or between 0 V and a pull‑up reference — consult vehicle wiring diagram for exact reference
Continuity: high-limit switch should show near 0 Ω (closed) when actuated and open (OL) when not actuated — verify with motor removed or access to switch pins
Watch for intermittent changes in the signal while moving the wiper through the high-limit position

Diagnostic algorithm

Verify complaint and retrieve DTCs with a capable scan tool. Note any related codes (wiper motor, supply, ground).
Perform a visual inspection: fuses, wiring harness to rear hatch/tailgate, and connector condition at rear wiper motor. Repair obvious damage.
With connector disconnected, check for power and ground at the motor connector with key on and wiper command active. Verify proper battery feed and ground continuity.
Backprobe the high-limit switch signal wire at the motor connector. Have an assistant operate the rear wiper and observe the signal: it should change state when the wiper reaches the high stop. Record voltages/behavior.
If the signal does not change or is intermittent, check continuity of the signal wire to the control module and inspect splice/connectors (including through the hatch harness). Repair any open/shorts.
If wiring and connectors are good but switch signal still incorrect, bench-test or remove the rear wiper motor and verify the internal high-limit/switch assembly. Replace motor or internal switch assembly if faulty.
If motor and wiring test good, check the body/control module input circuit and grounds. Compare measured voltages to wiring diagram and consider module replacement only after confirming wiring/motor are serviceable.
Clear codes and perform several full park cycles to confirm correct operation and that the DTC does not return.

Likely causes

Broken/disconnected wire between rear wiper motor and control module
Corroded pin or connector at the motor causing intermittent contact
Failed high-limit (park) switch inside rear wiper motor
Blown fuse or poor battery connection feeding the motor/control circuit

Fault status

⚠️ Status

Stored when the rear wiper high-limit (park) input signal is out of expected range, intermittent, open, or shorted, preventing the control module from confirming the rear wiper high stop position.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours