Code Definition

B1346 — Heated Backlite Input Circuit Short To Battery

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

About B1346

B1346 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 B1346 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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.

B1346 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 Body Control Module (BCM) monitors the heated backlite (rear defroster) request input circuit, which carries the activation signal from the dashboard switch to the BCM. DTC B1346 is set when the BCM detects that this input is shorted to battery voltage, holding the signal at a high state continuously regardless of switch position. The heated backlite system uses the BCM to receive the request and then commands a relay or internal driver that supplies high current to the conductive grid bonded to the rear glass. When this code is active the BCM may interpret the constant high signal as a pe...

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