Code Definition

B1353 — Ignition Key-In Circuit Open

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

About B1353

B1353 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 B1353 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.

B1353 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 an ignition key in circuit through a switch inside the lock cylinder that completes the circuit when the key is inserted. The BCM uses this signal to drive the key reminder chime, manage interior illumination timing, and coordinate with related theft and convenience features. DTC B1353 sets when the BCM detects an open in the key in circuit, meaning the input cannot reach a closed state when the key is physically present in the cylinder. This is most commonly an electrical fault between the lock cylinder switch and the BCM, or a failed switch that no long...

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