B1822 Rear Wiper Park Switch Circuit
The B1822 code indicates that the Body Control Module (BCM) or rear wiper module has detected a fault in the park switch circuit of the rear wiper. This sensor, typically integrated into the wiper motor, signals when the wiper blade reaches its parked position. A failure in this circuit prevents the system from knowing the blade's position, disabling automatic parking and potentially causing the wiper to stop in the wrong spot or not work at all.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty park switch inside the rear wiper motor
- Open or short to ground/battery in the wiring between the BCM/module and the rear wiper motor
- Corroded, loose, or damaged connector at the rear wiper motor
- Internal failure of the BCM or rear wiper control module
3. Symptoms You Will Notice
- Rear wiper does not park in the correct position
- Rear wiper operates erratically or stops mid-cycle
- Rear wiper may not work at all
4. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to the rear wiper system
Inspect the rear wiper motor connector for corrosion, damage, or loose terminals
Test the park switch circuit for continuity and shorts using a multimeter
If wiring and connector are good, replace the rear wiper motor assembly
If the issue persists, test the BCM or rear wiper module for proper output signals
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but the rear wiper may not function properly, which could reduce visibility in rain or snow. Have it repaired soon.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on whether the wiper motor or module needs replacement and labor rates.