Code Definition

B1103 — Ignition Power Failure

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

About B1103

B1103 is a manufacturer-specific body diagnostic trouble code recorded for Subaru vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

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.

B1103 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 Integrated Unit (BIU) monitors the ignition power feed circuit (IGN1) to verify proper voltage is present when the ignition switch is in the RUN or START position. DTC B1103 is logged when the BIU detects either an open circuit (no voltage) or a short to ground (voltage pulled low) on the ignition power feed for longer than the allowable detection time, indicating loss of ignition feed integrity. The IGN1 feed is used by the BIU to gate many body control functions based on key state, so a failure of this input can disable features that should only operate with the key in run. Typical ...

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