Code Definition

B1302 — Accessory Delay Relay Coil Circuit Failure

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

About B1302

B1302 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 B1302 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1302 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 accessory delay relay coil circuit, which controls retained accessory power to systems such as power windows, sunroof, and radio for a short period after the ignition is switched off. DTC B1302 is set when the BCM detects an electrical fault in the relay coil control circuit, such as an open circuit, short to ground, or short to battery voltage. The BCM typically supplies a ground signal to energize the relay coil, which then closes the contacts and supplies battery voltage to the accessory loads. When this code is set, the retained accessory power fe...

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