What does it mean?
B2215 is a Body (airbags, seat belts, body electronics) fault code. It indicates: FCM Internal (Totally Integrated Power Module) .
Symptoms
- The passenger front window drops on its own or keeps running down when the switch is released.
- The window will not go up from the master switch, or only works from the passenger door switch.
- One touch down operation stops working or triggers randomly.
- Window lockout and comfort open functions no longer respond.
- Battery drain because the door module stays awake with the input active.
Likely causes
- Liquid spilled into the driver master window switch, leaving a conductive bridge between the down contact and the switch supply.
- Worn or welded contacts inside the master switch that stay closed after use.
- Chafed harness in the driver door rubber boot where the wires flex, shorting the switch signal to a powered wire.
- Corrosion or water in the door module or switch connector.
- Aftermarket one touch or comfort closing modules wired into the window switch circuit.
- Internal driver or window module failure that misreads the input.
- On some vehicles this code number is used for an internal fault in the integrated power and fuse module instead, which then needs its own testing.
How to fix it
- Read and record the codes and clear them, then operate every window switch to see which action brings the code back.
- Remove the driver master switch and look for spilled liquid, sticky residue, corroded pins and heat damage on the down contact.
- Unplug the master switch and check whether the code still sets; if it does the fault is in the harness or module, not the switch.
- Backprobe the passenger down input and confirm it reads near ground or reference level at rest and only pulls up when the switch is pressed.
- With the switch disconnected, measure the input wire for battery voltage from the harness side to confirm a short to power.
- Flex the door boot loom while watching the reading to find broken or chafed conductors, then repair the harness properly.
- Replace the master switch or the door module only after the wiring tests clean, and relearn the window one touch positions afterwards.