B1695 — Autolamp On Circuit Short To Battery #

The description of this Diagnostic Trouble Code (DTC) may vary by manufacturer. Always refer to your OEM (Original Equipment Manufacturer) documentation for exact definitions.

• Autolamp On Circuit Short To Battery (Ford, Lincoln, Mercury)
• Automatic Headlamp Control Circuit Short to Battery (Mazda)
• Headlamp Auto-On Input Short to Battery (Some GM models)

Summary of code B1695 #

The B1695 code indicates that the vehicle’s electronic control module (ECM) has detected a short circuit to battery voltage in the autolamp on circuit. The autolamp system automatically turns the exterior lights (typically headlights) on or off based on ambient light conditions. This DTC is commonly found in vehicles equipped with automatic headlamp features. When this circuit is shorted to battery voltage, it usually means the control wire is receiving voltage at times when it shouldn’t, which can cause the headlamps to behave erratically. The result may be headlights staying on constantly or not responding properly to lighting conditions. If left unresolved, this issue can drain your battery or compromise nighttime driving safety.

Frequent symptoms for code B1695 #

When B1695 is present, the most recognizable symptom is abnormal headlamp behavior. The vehicle’s lighting system may not respond to changes in ambient light, and the “auto” function may not work as intended. Other symptoms can affect convenience, safety, and battery life.

• Headlamps remain on regardless of ambient light or ignition status
• Headlamps fail to turn on automatically at dusk or in darkness
• Warning light or message on the dashboard related to exterior lighting
• Intermittent or unpredictable headlamp activation
• Possible battery drain if lights stay on after the vehicle is off

Probable causes for code B1695 #

The B1695 DTC is almost always the result of an electrical issue within the autolamp circuit. Although the root cause varies, most are related to wiring faults, connector issues, or component failures. Here’s how they typically rank by likelihood:

1. Damaged wiring harness (chafed, pinched, or melted wires causing direct battery voltage to reach the autolamp circuit)
2. Faulty autolamp sensor (sensor shorted internally to battery voltage)
3. Corroded or loose connectors (especially near the sensor, switch, or BCM—Body Control Module)
4. Malfunctioning headlamp switch or stalk (mechanical or internal electronic short)
5. Body Control Module (BCM) failure (less common, but possible if BCM internally shorts the circuit)
6. Previous aftermarket electrical modifications (incorrectly installed alarm, remote start, or lighting accessories)

Step-by-step diagnosis for code B1695 #

A systematic approach ensures you don’t miss hidden issues. Use a digital multimeter (DMM) and always disconnect the battery if manipulating wiring. Here’s a proven diagnostic path:

1. Verify code and clear DTCs. Rescan to see if B1695 reappears.
2. Inspect headlamp operation. Check if the autolamps respond to light changes. Note any dashboard warnings.
3. Visually inspect wiring and connectors. Look for damage, corrosion, or aftermarket modifications in the autolamp circuit, especially under the dash, near the headlamp sensor, and at the BCM.
4. Test for voltage at autolamp circuit. With the ignition off, use the DMM to check for battery voltage at the autolamp wire. Presence of voltage when it should be zero confirms the short.
5. Check the autolamp sensor (often mounted on dash or behind rearview mirror). Disconnect sensor, recheck for voltage to isolate source.
6. Test headlamp switch and BCM functions. Use scan tool (if available) for BCM input/output status. Replace suspected faulty parts only after confirming wiring is intact.

Possible repairs for code B1695 #

Once the culprit is found, repairs are generally straightforward. Always use OEM-approved components and ensure all connections are clean and secure.

• Replace or repair damaged wiring harness in the autolamp circuit
• Replace faulty autolamp sensor or ambient light sensor
• Clean, repair, or replace corroded/loose connectors
• Replace malfunctioning headlamp switch or stalk assembly
• Replace or reprogram Body Control Module (if verified faulty)
• Correct or remove improperly installed aftermarket accessories

Is it safe to drive with code B1695? #

Driving with B1695 is possible, but not recommended for extended periods. If your headlights are stuck on, you risk draining your battery and straining electrical components. If they won’t turn on automatically, you may lose a critical safety feature for nighttime or low-light driving. In both cases, address the issue promptly to avoid further complications or safety risks.

Vehicles most affected by code B1695 #

This DTC is most commonly reported on vehicles equipped with automatic headlamp systems, especially those from North American manufacturers. While possible on any model with autolamp features, certain platforms have a higher incidence:

• Ford F-Series (F-150, F-250, F-350, etc.)
• Ford Explorer, Edge, and Fusion
• Lincoln MKX, Navigator
• Mercury Mountaineer
• Mazda vehicles with automatic headlamp systems
• Some GM models with “auto-on” headlight controls

Common mistakes & best practices for code B1695 #

Misdiagnosis is frequent with B1695 due to overlooked wiring faults or assumptions that the problem lies with expensive modules. To avoid wasted time and money, follow these guidelines:

• Don’t replace the BCM without fully inspecting the wiring and connectors first
• Always check for aftermarket wiring or modifications that may have altered the circuit
• Use the correct wiring diagram for your vehicle’s year, make, and model
• Label and document any connectors or wires you disconnect to avoid confusion
• After repairs, always clear codes and retest the system

FAQ for code B1695 #

Here are quick answers to the most common questions about B1695 — Autolamp On Circuit Short To Battery:

• Q: Will my headlights still work if I have B1695?
  A: Usually yes, but the automatic “auto-on” feature may be disabled or the headlamps may remain on at all times.
• Q: Can I fix B1695 myself?
  A: If you are comfortable with basic electrical diagnosis and can read a wiring diagram, you may be able to track down and repair obvious wiring faults. For anything involving the BCM or complex connectors, professional help is advised.