What Does B1611 Mean?
This diagnostic trouble code indicates that the Body Control Module (BCM) has detected an electrical fault in the rear wiper mode select switch circuit. The switch, which allows the driver to select different rear wiper operating modes (intermittent, low, high, etc.), is either sending an invalid signal, no signal at all, or experiencing a short or open circuit condition. The BCM monitors this circuit continuously and sets this code when voltage readings fall outside expected parameters.
Common Causes
45%
Faulty rear wiper mode select switch with internal contact wear or failure
30%
Damaged or corroded wiring harness and connectors between switch and BCM
15%
Poor ground connection in rear wiper switch circuit
10%
Failed Body Control Module with internal circuit damage
Diagnostic Steps
1
Step 1: Perform visual inspection of the rear wiper switch and all associated wiring harnesses for obvious damage, corrosion, water intrusion, or loose connections. Check connector pins for bent, backed-out, or corroded terminals.
2
Step 2: Using a digital multimeter, check for battery voltage (typically 12V) at the switch input terminal with ignition on. Verify proper ground continuity (less than 1 ohm resistance) at the switch ground circuit.
3
Step 3: Test the rear wiper mode select switch operation by measuring resistance across switch terminals while cycling through all switch positions. Compare readings to manufacturer specifications (typically ranging from 0 ohms to several thousand ohms depending on mode selected).
4
Step 4: If switch tests good, measure voltage and continuity on all wires between the switch connector and BCM connector using wiring diagram reference. Check for opens (infinite resistance), shorts to ground (0 ohms to ground), or shorts to power (unexpected voltage present).
5
Step 5: If all wiring and switch test within specifications, suspect BCM internal fault. Verify BCM connector terminals are clean and tight, then consider BCM replacement or professional-level diagnostics with factory scan tool to test BCM internal circuits.
6
Step 6: After repairs, clear codes, cycle rear wiper through all modes multiple times, and road test to verify fault does not return. Monitor live data for proper switch signal recognition by BCM.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This diagnostic trouble code indicates that the Body Control Module (BCM) has detected an electrical fault in the rear wiper mode select switch circuit. The switch, which allows the driver to select different rear wiper operating modes (intermittent, low, high, etc.), is either sending an invalid si...
The most common cause of B1611 (Wiper Rear Mode Select Switch Circuit Failure) is: Faulty rear wiper mode select switch with internal contact wear or failure
Typical repair costs for B1611 range from $75 to $450, 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 and does not impact vehicle safety systems or driveability. Repair at convenience, though rear visibility in inclement weather may be compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1611 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System - Wiper/Washer Controls
Difficulty
Type
Manufacturer
Recommended Tools
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