Body and comfort

B1325 — Driver Door Ajar Circuit Fault

Severity: low Safe to drive

What B1325 means

The body control module (BCM) monitors the signal circuit of the driver door ajar switch. Normally the switch connects the circuit to ground or opens it, and the BCM uses that to control the dash lamp, dome light and door chimes. B1325 is set when the circuit shows a higher voltage than expected, such as a short to battery voltage or a fault in the switch circuit.

Symptoms

  • Door ajar lamp stays on with all doors closed
  • Door ajar lamp does not light when the door is open
  • Door warning lamp flickers or behaves erratically
  • Dome light stays on
  • Unwanted chimes or false door warnings
  • Alarm system problems
  • Battery drain while parked

Possible causes

  1. Short to battery or high voltage in the door ajar circuit wiring
  2. Faulty driver door ajar switch
  3. Corroded or damaged connectors
  4. Damaged wiring in the door jamb harness (chafed or broken wires)
  5. Misaligned door striker keeping the latch from closing fully
  6. Faulty BCM misreading the circuit voltage

How to diagnose

  1. Scan all modules, note the code, clear it and see whether B1325 returns
  2. Watch the door status in scan tool data while opening and closing the door
  3. Inspect the door switch and latch for dirt, moisture and corrosion
  4. Check the striker position and make sure the door latches fully
  5. Inspect the harness in the door boot for chafing, broken wires and shorts
  6. Check connectors for corrosion and test the circuit for continuity
  7. Measure the signal wire voltage with the door open and closed, following the wiring diagram
  8. If wiring and switch are good, verify BCM power and ground before suspecting the module

Common fixes

  • Repair or replace damaged wiring
  • Replace the faulty door ajar switch
  • Clean or replace corroded connectors
  • Adjust the door striker
  • Replace or reprogram the BCM if it is confirmed faulty

B1325 on different brands

Chevrolet · manuals
Some Chevrolet references list this code as a control module power circuit low or high voltage fault, so confirm the definition in the service information for your model and year.

Questions and answers

What does code B1325 mean?

It is a body electrical code: the BCM detected an incorrect, usually high, voltage in the driver door ajar circuit. The usual culprits are the door switch, wiring or a connector.

Can I drive with B1325?

Yes, it does not affect the engine or handling. Keep an eye on the battery, though, because a dome light or other loads staying on can drain it.

Why is the door ajar light on when the doors are closed?

The door switch is often stuck or dirty, or the circuit has a short or a poor connection. A misaligned striker that stops the door from latching fully can also cause it.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.