Code Definition

B1356 — Ignition Run Circuit Open

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

About B1356

B1356 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 B1356 is stored, the module has detected an open (broken or disconnected) electrical path 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.

B1356 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 ignition run circuit, which provides switched battery voltage to the BCM whenever the ignition switch is rotated to the RUN position. The BCM relies on this voltage to enable accessories, illuminate dash warning lamps, and authorise starter operation through the immobiliser strategy. DTC B1356 sets when the BCM measures an open or near zero voltage condition on the ignition run input while the key is commanded to RUN, indicating the supply path from the ignition switch has been interrupted somewhere between the switch contacts, the protection fuse, an...

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