B1695 Autolamp Circuit Short to Battery
The B1695 code indicates a short-to-battery fault in the autolamp (automatic headlight) circuit. The body control module (BCM) detects an abnormally high voltage on the autolamp circuit, exceeding the manufacturer's specified operating range. This can cause the automatic lighting system to behave erratically, such as turning on when ambient light is sufficient or failing to turn off.
1. Commonly Affected Makes
2. Most Common Causes
- Short to voltage in the autolamp circuit harness
- Damaged or internally shorted ambient light sensor
- Faulty body control module (BCM)
- Worn insulation causing contact with a power line
- Corroded or bent pins in the electrical connector creating a voltage bridge
3. Symptoms You Will Notice
- Automatic headlights turn on unexpectedly in bright conditions
- Headlights remain on continuously even when the vehicle is off
- Autolamp system fails to respond to ambient light changes
4. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to the autolamp system
Inspect the autolamp circuit wiring and connectors for damage, corrosion, or short circuits
Test the ambient light sensor for proper resistance and voltage output
Verify BCM operation and check for other related fault codes
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive with this code, but the automatic headlights may not function correctly. You can manually operate the headlights as needed.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the issue is a simple wiring repair or requires replacing the ambient light sensor or BCM.