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Window Passenger Rear Remote Down Switch Short to Battery

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Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

Try the other key before touching any wiring, an identity mismatch is often just a key problem.

  • BBody
  • 2Manufacturer-specific
  • 1Body
  • 94Sequence number

What does it mean?

B2194 is a Body (airbags, seat belts, body electronics) fault code. It indicates: ID Discord - IMMU-I-KEY . This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.

Symptoms

  • Engine cranks but will not start, or starts and stalls within a couple of seconds
  • Security or immobiliser indicator flashing instead of going out
  • Only one of the keys works, the other is rejected
  • Intermittent no start that comes and goes without a pattern
  • Rear passenger window drops on its own or will not respond, on the window variant
  • Message in the display about the key not being recognised

Likely causes

  • Key never programmed to this vehicle, or a cloned or aftermarket transponder that the system will not accept
  • Transponder chip in the key damaged by impact or water
  • Other transponder keys or heavy metal items on the same key ring confusing the antenna
  • Weak antenna amplifier signal so the identity is read incompletely
  • Immobiliser unit lost its stored key data after a low voltage event or a failed write
  • Control unit replaced without carrying out the key registration procedure
  • Liquid spilled into the master switch bridging the window down input to a supply pin, on the window variant
  • Wiring chafed in the door boot touching a live conductor

How to fix it

  1. Confirm the manufacturer definition for this vehicle
  2. Start with the spare key, if the vehicle starts normally the first key or its programming is at fault
  3. Remove all other transponders and metal objects from the key ring and retry
  4. Test the battery, low voltage disturbs both the transponder read and the immobiliser memory
  5. Inspect and reseat the antenna ring connector at the ignition lock
  6. Read the immobiliser data with a capable tool and check how many keys are registered
  7. Re register the keys following the manufacturer procedure, then check every key works
  8. For the window variant, unplug the master switch and measure the down input for voltage, then repair the switch or harness as proven

Codes From the Same System

All Fault Codes

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This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.