Code Definition

B1209 — EIC Switch-2 Assembly Circuit Failure

System: Body  |  Type: Manufacturer-Specific  |  Make: Generic

About B1209

B1209 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1209 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1209 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Electronic Integrated Control (EIC) module manages operation of a second integrated switch assembly, designated Switch 2, which typically handles a distinct cluster of buttons for climate, infotainment, or auxiliary vehicle functions depending on the platform. DTC B1209 sets when the module detects an electrical failure in the Switch 2 assembly circuit, covering any combination of open, short to ground, short to battery voltage, or out of range resistance on the switch input. The switches communicate with the module through a resistive ladder or multiplexed signal, and any disruption to th...

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