B0265 Driver Door Lock/Unlock Switch Circuit

Nothing in the publicly available J2012 sources or carmaker literature mentions B0265, so it is unverifiable; related codes are B0270 and B0272. The lock/unlock button in the driver's door tells the body or door module to run all lock motors, as HELLA's overview of central locking describes. In the Sumitomo patent US6365986B1 the switch pulls one of two inputs, each held high by a pull-up, to ground, and the module acts on the high-to-low edge rather than the level; after a reset it assumes the switch is pressed so that no second, false lock cycle follows. A circuit fault therefore means a line stuck low, which can block other lock commands or cycle the locks, or an open line that makes the button dead.

Likely causes

Symptoms

• Doors cannot be locked or unlocked with the interior button
• Locks cycle on their own or ignore the remote key

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: hella.com, patents.google.com.