Code Definition

B1350 — Heated Backlite Relay Short To Ground

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

About B1350

B1350 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 B1350 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.

B1350 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) controls the heated backlite (rear defroster) by commanding a relay that switches battery voltage to the high current heater grid bonded to the rear glass. DTC B1350 sets when the BCM detects that the relay control circuit is shorted to ground while the relay should be off, indicating the control line is being pulled low by an external fault rather than by the BCM driver. The BCM monitors the voltage on the relay control terminal and compares it against the commanded state, flagging a short to ground when the line stays low at the wrong time. With this code presen...

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