What Does B1828 Mean?
This code indicates the Body Control Module (BCM) has detected that the rear wiper high limit input circuit has an abnormal voltage condition consistent with a short to battery voltage. The high limit input is typically a park position switch or end-of-travel sensor that signals when the wiper has reached its maximum position. The BCM detected voltage on this circuit when it should be at ground or a lower reference voltage, indicating an electrical short to positive battery voltage somewhere in the circuit.
Common Causes
45%
Damaged or chafed wiring harness between BCM and rear wiper motor causing short to battery voltage
30%
Failed rear wiper motor assembly with internal short in position sensor circuit
15%
Water intrusion or corrosion in rear wiper motor connector causing cross-circuit short
10%
Failed or shorted Body Control Module internal circuitry
Diagnostic Steps
1
Step 1: Perform visual inspection of rear wiper motor connector and wiring harness for obvious damage, chafing against liftgate hinges, water intrusion, corrosion, or pinched wires. Pay special attention to areas where harness flexes during liftgate operation.
2
Step 2: Disconnect rear wiper motor connector and use a digital multimeter to measure voltage on the high limit input circuit pin at the harness side connector with ignition on. Reading should be 0-1 volt; if 12+ volts present, short exists in harness between motor and BCM.
3
Step 3: If voltage is present at harness connector, disconnect BCM connector and re-measure circuit. If voltage disappears, BCM is faulty. If voltage remains, inspect and ohm test the wiring harness for short to power using continuity mode between suspect circuit and known power sources.
4
Step 4: If harness tests good, reconnect harness and measure resistance across high limit sensor terminals at motor connector with motor disconnected. Resistance should vary with manual wiper arm movement; constant low resistance or direct continuity to power pin indicates failed motor assembly.
5
Step 5: Repair or replace identified faulty component, clear codes, and cycle rear wiper through full range of operation multiple times while monitoring live data for proper high limit signal voltage transitions to verify repair.
Estimated Repair Cost
$120 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected that the rear wiper high limit input circuit has an abnormal voltage condition consistent with a short to battery voltage. The high limit input is typically a park position switch or end-of-travel sensor that signals when the wiper has r...
The most common cause of B1828 (Wiper Rear High Limit Input Circuit Short To Battery) is: Damaged or chafed wiring harness between BCM and rear wiper motor causing short to battery voltage
Typical repair costs for B1828 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 wiper park position functionality. Rear wiper may not park correctly or may become inoperative, reducing rear visibility in inclement weather. Repair at next convenient opportunity.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1828 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System - Rear Wiper
Difficulty
Type
Manufacturer
Recommended Tools
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