Code Definition

B1836 — Door Unlock Disarm Output Circuit Short To Battery

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

About B1836

B1836 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1836 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.

B1836 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

DTC B1836 is set when the Body Control Module (BCM) detects the Door Unlock Disarm output circuit is shorted to battery voltage on Ford vehicles equipped with the Passive Anti-Theft System (PATS). The disarm output is the BCM driven command line that releases the antitheft state and triggers the unlock sequence after a valid disarm event. With the output at rest the BCM expects the wire to sit at a defined low or pulled state, and a constant battery voltage on this line indicates either a chafe to a 12V supply, an internally damaged downstream module pulling the line high, or a fault in the BC...

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