What Does B1826 Mean?
This manufacturer-specific body control module (BCM) code indicates that the rear wiper system has detected a circuit voltage or signal that exceeds the normal operating range (high limit exceeded). The BCM monitors the rear wiper motor circuit and has identified an abnormally high input voltage or current draw, which could indicate a short to voltage, faulty motor, or control module issue. This fault prevents proper rear wiper operation and is stored when the BCM detects the out-of-range condition.
Common Causes
35%
Rear wiper motor internal short or seized mechanism causing excessive current draw
30%
Wiring harness short to voltage between BCM and rear wiper motor
20%
Corroded or damaged connector pins at wiper motor or BCM causing resistance and voltage spikes
10%
Faulty body control module with internal relay or driver circuit failure
5%
Rear wiper switch or multifunction switch sending incorrect high signal
Diagnostic Steps
1
Step 1: Perform visual inspection of rear wiper motor and linkage for physical binding, ice accumulation, or mechanical obstruction. Manually move wiper arm to verify free movement without resistance.
2
Step 2: Disconnect rear wiper motor connector and use multimeter to measure resistance across motor terminals (typically 3-8 ohms). Check for short to ground or open circuit conditions.
3
Step 3: With motor disconnected, inspect wiring harness and connector pins for corrosion, pushed-back pins, or damaged insulation. Check for continuity between BCM connector and motor connector, and test for short to voltage (B+) on motor supply circuit with ignition on.
4
Step 4: Reconnect motor and use multimeter to measure current draw during wiper operation (typical draw 2-5 amps). If current exceeds specifications or motor does not operate, replace rear wiper motor.
5
Step 5: If wiring and motor test normally, access BCM connector and measure voltage at wiper control circuit with wiper activated. Compare readings to manufacturer specifications (typically 0-14V range depending on vehicle).
6
Step 6: Clear codes, operate rear wiper through all modes, and verify code does not return. If fault persists with known-good motor and wiring, BCM replacement may be required.
Estimated Repair Cost
$120 - $650
Parts + labor, varies by vehicle and location
This manufacturer-specific body control module (BCM) code indicates that the rear wiper system has detected a circuit voltage or signal that exceeds the normal operating range (high limit exceeded). The BCM monitors the rear wiper motor circuit and has identified an abnormally high input voltage or ...
The most common cause of B1826 (Wiper Rear High Limit Input Circuit Failure) is: Rear wiper motor internal short or seized mechanism causing excessive current draw
Typical repair costs for B1826 range from $120 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects rear window visibility enhancement. Repair at convenience, though reduced rear visibility in inclement weather may compromise safe operation in poor conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1826 to identify the root cause.
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Quick Info
Category
Body
System
Body Control / Wiper System
Difficulty
Type
Manufacturer
Recommended Tools
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