What Does B1829 Mean?
This code indicates the Body Control Module (BCM) has detected a short to ground condition in the rear wiper motor high limit input circuit. The high limit input typically monitors the wiper motor's park position or end-of-travel switch to ensure the wiper arm stops at the correct position. The BCM detected voltage on this circuit is lower than expected, consistent with an unintended ground connection in the wiring, switch, or motor assembly.
Common Causes
40%
Damaged or chafed wiring harness between BCM and rear wiper motor creating short to ground
30%
Failed rear wiper motor with internal short to ground in park position switch
20%
Corroded or water-damaged connector pins at rear wiper motor causing ground fault
10%
Faulty Body Control Module with internal circuit failure on wiper input channel
Diagnostic Steps
1
Step 1: Perform visual inspection of rear wiper motor and wiring harness for obvious damage, chafing, pinch points, or water intrusion. Check connector at wiper motor for corrosion, bent pins, or moisture.
2
Step 2: Disconnect rear wiper motor connector and use a digital multimeter to measure resistance between the high limit input circuit pin (consult wiring diagram) and ground with motor disconnected. Reading should be infinite (open circuit); any continuity indicates wiring harness short to ground.
3
Step 3: If wiring tests good, measure resistance of the high limit switch circuit within the wiper motor itself between the appropriate terminal and motor ground. Compare readings to manufacturer specifications; low or zero resistance indicates internal motor failure.
4
Step 4: Inspect wiring harness routing from liftgate/hatch area through body panels and grommets for pinch points or damage. Wiggle test harness while monitoring resistance to identify intermittent shorts.
5
Step 5: If all wiring and motor test within specifications, verify BCM input circuit by checking voltage supply and return circuits per service manual. BCM may require replacement if internal circuit fault is confirmed.
6
Step 6: After repair, clear codes, actuate rear wiper through all modes, and verify code does not return. Monitor wiper park position function to ensure proper operation.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to ground condition in the rear wiper motor high limit input circuit. The high limit input typically monitors the wiper motor's park position or end-of-travel switch to ensure the wiper arm stops at the correct position. The BCM ...
The most common cause of B1829 (Wiper Rear High Limit Input Circuit Short To Ground) is: Damaged or chafed wiring harness between BCM and rear wiper motor creating short to ground
Typical repair costs for B1829 range from $100 to $600, 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 operation. Rear visibility may be compromised in inclement weather if rear wiper is inoperative, but this is not a critical safety concern for most driving conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1829 to identify the root cause.
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Quick Info
Category
Body
System
Body Systems - Rear Wiper/Washer
Difficulty
Type
Manufacturer
Recommended Tools
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