Code
B1611
Other
B — Body
Wiper Rear Mode Select Switch Circuit Failure
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the rear wiper mode switch circuit
- Corroded or loose connector at the switch or BCM
- Failed rear wiper mode select switch
- Faulty BCM or wiper control module (rare)
- Blown fuse or failed relay in related circuit
- Water intrusion or mechanical damage to switch assembly
Symptoms
- Rear wiper modes (intermittent/low/high/park) do not change or are unresponsive
- Rear wiper stuck in one mode or fails to park correctly
- Intermittent rear wiper operation or erratic behavior
- Instrument cluster or message alert indicating switch/circuit fault
- No rear wiper function when other wipers operate normally
What to check
- Read DTCs and freeze frame data with a scan tool; note whether B1611 is current or intermittent
- Attempt to reproduce the fault by cycling the rear wiper switch through all positions
- Visual inspection of switch, connector, and wiring harness for damage, corrosion, or water intrusion
- Check related fuses and any wiper relays (replace if blown or suspect)
- Wiggle test wiring and connectors while observing switch operation or scan tool data
Signal parameters
- Switch OFF position: expected open/neutral signal or reference voltage per vehicle wiring (scan tool should show OFF state)
- Switch ON/mode positions: each mode should present a distinct, stable signal to BCM (voltage or resistance change) when selected
- No-load voltage at switch connector: approximate battery voltage (~11–14V) where applicable
- Continuity/Resistance: internal switch contacts should change resistance when toggled; infinite/open when expected and low ohms when closed (manufacturer values vary)
- Intermittent readings or floating voltages indicate broken wires, poor grounds, corroded pins, or internal switch failure
Diagnostic algorithm
- Connect a scan tool and confirm B1611; record freeze frame and any related codes; clear codes and attempt to reproduce
- Perform a visual inspection of the rear wiper mode switch, its connector, and wiring harness for damage, corrosion, or water ingress
- Check fuses and relays for the wiper circuit; replace if faulty and retest
- Backprobe switch connector while cycling modes: verify reference voltage, signal voltage changes or resistance changes for each position per vehicle wiring diagram
- If signals are missing or erratic, perform continuity checks between the switch and BCM connector pins; repair any opens/shorts
- Inspect and clean connectors and terminals; apply dielectric grease after repair to prevent corrosion
- If switch wiring and connectors are good, bench-test or substitute a known-good switch to verify operation
- If good switch and wiring persistently show correct signals but code remains, check BCM inputs and grounds; test for proper grounds and supply voltages at BCM
- If BCM or wiper control module malfunction is suspected, consult manufacturer diagnostics before replacement; program or reinitialize modules as required
- After repairs, clear codes and road-test to confirm proper operation and that B1611 does not return
Likely causes
- Damaged/shorted harness between switch and BCM
- Corroded pins or poor mating at the switch connector
- Internal failure of the rear wiper mode select switch
- Faulty ground at switch or BCM
- Intermittent connector due to moisture or vibration
Fault status
Status
B1611 — Rear wiper mode select switch circuit failure: signal out of range or intermittent
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Brands with available manuals
7,761
The library contains 7,761 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email