OBD Guide
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B1694

Autolamp On Circuit Open

B1694 is an OBD-II diagnostic trouble code meaning: Autolamp On Circuit Open. Common causes: broken wire in the wiring harness, light sensor malfunction. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–111 (est.)

Symptoms

  • Automatic headlights don't work
  • Headlights do not turn on in low light conditions
  • Error message on the dashboard

Causes

  • Broken wire in the wiring harness
  • Light sensor malfunction
  • Problems with the headlight control module
  • Short circuit in the circuit
  • Faulty relay or fuse

How to Fix

  1. Check the integrity of the wiring harness
  2. Check light sensor
  3. Check the headlight control module
  4. Check relays and fuses
  5. Replace faulty components

Related codes

B1695B1696B1697

FAQ

What does the B1694 code mean?

B1694 is an OBD-II diagnostic trouble code that indicates: Autolamp On Circuit Open

What causes a B1694 error code?

The most common causes of B1694 include: Broken wire in the wiring harness; Light sensor malfunction; Problems with the headlight control module; Short circuit in the circuit.

How do I fix a B1694 diagnostic trouble code?

To fix B1694: Check the integrity of the wiring harness. Check light sensor. Check the headlight control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1694?

Limited driving only, diagnose soon

How much does it cost to fix B1694?

The estimated repair cost for B1694 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat