B2194

Window Passenger Rear Remote Down Switch Short to Battery

Body Chassis/Safety Power Window Control 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

The passenger rear window's down switch is sending a constant "battery power" signal to the ECU instead of the normal variable signal, like a stuck light switch that's always on. This prevents the ECU from properly controlling the window motor.

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Symptoms You May Notice

3 known symptoms for this code
Passenger rear window won't operate via remote switch
Window may be stuck in one position or move erratically
No response when pressing down button on door or master switch
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the voltage signal from the passenger rear window down switch, expecting it to toggle between ground (0V) when pressed and battery voltage (12V) when released. A short to battery keeps the signal constantly at 12V, preventing the ECU from detecting button presses or releasing the motor.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Switch Signal Voltage 0V (pressed) to 12V (released) with transitions Constant 12V with no voltage transitions
Signal Continuity Intermittent changes based on switch input Stuck high voltage, no state changes
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Passenger rear door switch panel connector
Disconnect and reconnect the switch connector to reseat it, as loose connections often cause short-to-battery faults.
2
Passenger rear window down switch
Replace the faulty switch unit, which likely has internal wiring shorted to the battery contact.
3
Door wiring harness section
Inspect and repair any damaged or pinched wires in the passenger rear door harness that may be grounding to battery voltage.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B2194 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
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How to Clear Code B2194

What happens after you fix the fault

Once the fault is repaired, B2194 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When
  • Fault has been diagnosed and repaired
  • You want to confirm the repair worked
  • Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
  • Preparing for an emissions/PUC test
  • Root cause is still undiagnosed
  • Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.