Code Definition

B1343 — Heated Backlite Input Circuit Failure

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

About B1343

B1343 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1343 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.

B1343 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 heated backlite input circuit is the wire that carries the rear defroster switch request signal from the heated backlite switch on the dash to the Body Control Module (BCM) on Ford vehicles. When the driver presses the rear defroster switch the input is pulled low, which prompts the BCM to energise the heated backlite relay or to send a network message commanding the rear glass heating element on for the timed defrost cycle. DTC B1343 sets when the BCM detects an electrical failure of this input circuit, including an open circuit, a short to ground that holds the request continuously activ...

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