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Mirror Switch Assembly Circuit Short to Battery

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Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

Read the door module codes and watch the switch inputs in live data with nobody touching the switch to see which one is stuck active.

  • BBody
  • 2Manufacturer-specific
  • 3Body
  • 38Sequence number

What does it mean?

B2338 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Horn Control Circuit Open .

Symptoms

  • A mirror keeps driving in one direction whenever the ignition is on, without anyone touching the switch.
  • The mirror motor buzzes or strains at its end stop and can eventually be damaged.
  • Mirror memory recall and reverse tilt are locked out while the switch input is considered stuck.
  • Other functions in the same switch pack behave abnormally.
  • Battery drain because the door module stays awake with an input permanently active.

Likely causes

  • Liquid spilled into the switch assembly bridging a switch contact to the switch supply.
  • Switch contacts worn or welded closed after long use, keeping the input active.
  • Chafed wiring inside the door panel where a switch wire touches a permanently live conductor.
  • Water and corrosion inside the switch or door module connector bridging pins.
  • Aftermarket wiring for lamps, speakers or alarm sensors spliced into the door switch loom.
  • Bent or pushed back terminal in the connector contacting a powered pin.
  • Door module input stage failure.

How to fix it

  1. Read the door module codes and watch the switch inputs in live data with nobody touching the switch to see which one is stuck active.
  2. Unplug the mirror switch assembly and check whether the input goes inactive; if it does, the switch is at fault.
  3. If the input stays active with the switch unplugged, measure that wire from the harness side for battery voltage to confirm a short to power.
  4. Inspect the switch for spilled liquid, residue, burnt contacts and corroded pins, and check the door connector for water.
  5. Trace the door harness for chafing, crushed sections and non factory splices, particularly around the armrest and the door boot.
  6. Repair the wiring with sealed crimped joints, replace damaged terminals and remove any accessory wiring tapped into the switch circuits.
  7. Fit a new switch assembly or door module once the wiring is proven, then check every mirror function and reprogram the memory positions.

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.