B2204 — Left Rear Window Switch Stuck in Up Position

Causes

• Failed/shorted left rear window switch (mechanical contact stuck)
• Corroded, bent, or damaged switch connector or wiring (short to power or ground)
• Window regulator or motor mechanically jammed causing feedback anomaly
• Water intrusion or debris inside switch assembly
• Faulty body control module (BCM) or module software/firmware fault
• Poor ground or power supply to switch or BCM

Symptoms

• Left rear window will not move down (may be stuck closed)
• Switch feels stuck, loose, or does not click normally
• Window moves only in one direction or only with held manual input
• Other door/window functions may be affected if BCM input/output fault exists
• Possible blown fuse or repeated electrical faults when operating window

What to check

• Read and record DTC with a scan tool; capture freeze frame/live data while attempting operation
• Visually inspect left rear door switch for contamination, broken actuator, and secure mounting
• Inspect connector at switch and door harness for corrosion, bent pins, water, or damage
• Operate switch while probing for voltage and ground at switch terminals with a multimeter or oscilloscope
• Check for power (12 V) feed and good ground at switch with ignition on
• Unplug switch and measure continuity/ohms of internal switch positions (up/down) per service manual

Signal parameters

• Battery supply to switch: ≈ battery voltage (12–14 V) with ignition/DRL as required
• Switch ground: near 0 V with good chassis ground
• Switch up-output: toggles to ~12 V (or to ground depending on design) only when pressed; B2204 will show constant up-command state
• Resistance between switch terminals: open when not pressed, low ohms when pressed (refer to service spec)
• CAN/BUS message: door switch input bit should change state when operated (compare to right-side switch)

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