B1322: Driver Door Ajar Circuit Short to Ground
The B1322 code indicates that the vehicle's body control module (often the GEM or BCM) has detected a short to ground in the driver door ajar switch circuit. This circuit typically uses a reference signal that is pulled to ground when the door is open. A permanent short to ground causes the module to incorrectly interpret the door as always open, triggering a continuous or intermittent door ajar warning on the instrument panel.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or corroded driver door ajar switch
- Wiring insulation damage causing contact with chassis ground
- Moisture or corrosion in the door switch connector causing a short to ground
- Faulty GEM or body control module with internal detection circuit failure
- Damaged door harness due to friction or repeated flexing
3. Symptoms You Will Notice
- Door ajar warning light stays on or flashes intermittently
- Interior dome light stays on or behaves erratically
- Possible battery drain if light stays on
- Keyless entry or alarm system may malfunction
4. Step-by-Step Diagnosis
Scan for codes and verify B1322 is present
Visually inspect driver door switch and connector for corrosion or damage
Test switch operation with multimeter: check for continuity when door is open and closed
Check wiring between switch and BCM for shorts to ground or opens
If wiring and switch are good, test BCM output or replace module as last resort
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but the door ajar warning may be distracting and the interior light may stay on, which can drain the battery if left unattended.
How much does it cost to fix?▼
Repair costs typically range from $50 to $200 for switch replacement, $100 to $300 for wiring repair, and $200 to $600 for BCM replacement, depending on labor rates and parts.