What Does B1616 Mean?
B1616 indicates the Body Control Module (BCM) has detected an open circuit in the rear wiper disable switch circuit. This switch, typically located on the instrument panel or center console, allows the driver to manually disable the rear wiper function. The open circuit means the BCM is not receiving proper electrical continuity through the switch circuit, which could be due to wiring damage, a faulty switch, or poor connections.
Common Causes
45%
Open or damaged wiring between the rear wiper disable switch and BCM, including broken wires, corroded terminals, or damaged connectors
35%
Faulty or failed rear wiper disable switch with internal open circuit or mechanical failure
15%
Poor ground connection or corroded ground point in the rear wiper disable circuit
5%
BCM internal circuit failure or software corruption affecting the disable switch input
Diagnostic Steps
1
Step 1: Locate and visually inspect the rear wiper disable switch and its connector for physical damage, corrosion, or loose connections. Check for pushed-back pins or moisture intrusion in the connector.
2
Step 2: Using a digital multimeter, test the rear wiper disable switch for continuity across its terminals in both positions (enabled/disabled). The switch should show continuity in one position and open circuit in the other, or vice versa depending on design.
3
Step 3: With ignition on, measure voltage at the switch connector supply wire (reference manufacturer wiring diagram for pin identification). Verify proper reference voltage (typically 5V or 12V) is present from the BCM.
4
Step 4: Disconnect both ends of the circuit and perform continuity testing on the wiring harness between the switch and BCM connector. Check for open circuits, shorts to ground, or shorts to power. Also test ground circuit continuity.
5
Step 5: If all wiring and switch test normal, check BCM connector for corrosion, damage, or terminal issues. Verify proper seating and pin contact.
6
Step 6: Clear the code, operate the rear wiper disable switch through multiple cycles, and verify the code does not return. Monitor live data for switch status change in the BCM.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
B1616 indicates the Body Control Module (BCM) has detected an open circuit in the rear wiper disable switch circuit. This switch, typically located on the instrument panel or center console, allows the driver to manually disable the rear wiper function. The open circuit means the BCM is not receivin...
The most common cause of B1616 (Wiper Rear Disable Switch Circuit Open) is: Open or damaged wiring between the rear wiper disable switch and BCM, including broken wires, corroded terminals, or damaged connectors
Typical repair costs for B1616 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle safety or driveability. The rear wiper may remain constantly enabled or disabled depending on the failure mode. Repair can be scheduled at convenience, though rear visibility may be reduced in wet conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1616 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System
Difficulty
Type
Manufacturer
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