B1822

Code

Other B — Body

Wiper Rear Park Sense Input Circuit Failure

Brand: Other

Type: B — Body

Views: UK: 31 EN: 39 RU: 24

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Page language: EN

Causes

Open or shorted wiring in the rear wiper park sense circuit
Corroded, loose or damaged connector(s) at the rear wiper motor or module
Faulty park switch inside the rear wiper motor assembly
Poor or missing ground for the motor or module
Blown fuse or power supply issue to the wiper motor/module
Water intrusion into the motor connector or harness

Symptoms

Rear wiper will not park (stops in wrong position) or will not stop
Rear wiper does not operate or is intermittent
DTC B1822 stored; possible related dash indicator or service message
Wiper may run continuously or take wrong park position after turning off

What to check

Retrieve codes and freeze-frame data with scan tool; note conditions when code set
Visually inspect the rear wiper motor connector, pins and wiring for corrosion, damage, or water intrusion
Check related fuses and power feeds for the rear wiper circuit
Backprobe the park sense pin at the module and at the motor while operating wiper (observe voltage changes)
Perform wiggle test on harness while monitoring park sense signal for intermittent faults
Measure resistance/continuity between module input and rear wiper motor park switch (with ignition off)

Signal parameters

Park sense input is typically a switched digital signal referenced to ground or battery—expect either near 0 V (logic low/ground) when at park or battery voltage/open (logic high) when not parked—consult OEM wiring for exact behavior
When wiper runs, motor supply should switch to ~12 V and return to 0 V when stopped
Continuity: low resistance between park switch contacts when in park; open when not in park (exact ohms vary by design)
No-load supply voltage to motor circuit: ~11–14 V when powered

Diagnostic algorithm

Safety: Park vehicle, key off, wear eye protection. Retrieve B1822 and any related codes; record freeze-frame data.
Visual inspection: Inspect rear wiper motor connector, pins, and harness for corrosion, bent pins, damage, or water. Repair any obvious damage.
Verify power/ground: Check fuses and battery feed to the rear wiper motor and module. Verify good ground at motor and module harness ground point.
With a scan tool monitor/command: Use a scan tool to monitor the rear wiper park input PID while operating the wiper. Note signal state at park vs non-park.
Backprobe tests: Backprobe the park sense wire at both the motor connector and the module with connector connected. Confirm expected voltage levels (see Signal Parameters).
Wiggle test: While monitoring the park sense signal, gently wiggle the harness from motor to module to detect intermittent changes; inspect for chafe points.
Continuity/isolation: With ignition off and connector disconnected, measure continuity/resistance of park switch circuit between motor and module. Repair open or short to ground/battery as found.
Direct motor test: If wiring checks good, bench-test or apply known good power/ground to the wiper motor to verify motor and internal park switch operation. Replace motor assembly if internal park switch fails.
Module verification: If motor and wiring test good but input remains invalid at the module, verify module grounds and inputs; consider module replacement only after wiring and motor verified.
Clear codes and road/test to verify repair: Confirm DTC does not return and rear wiper parks correctly after several cycles.