OBD Guide
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B1689

Autolamp Delay Circuit Failure

B1689 is an OBD-II diagnostic trouble code meaning: Autolamp Delay Circuit Failure. Common causes: open or short circuit in wiring harness, faulty delay relay. Estimated repair cost: $11–56.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • No headlight turn-off delay
  • Headlights do not turn on automatically
  • Incorrect operation of the automatic lighting system

Causes

  • Open or short circuit in wiring harness
  • Faulty delay relay
  • Problems with the lighting control unit
  • Contact corrosion

How to Fix

  1. Check wiring harness for damage
  2. Check delay relay
  3. Diagnose the lighting control unit
  4. Clean or replace corroded contacts

Related codes

B1688B1690

FAQ

What does the B1689 code mean?

B1689 is an OBD-II diagnostic trouble code that indicates: Autolamp Delay Circuit Failure

What causes a B1689 error code?

The most common causes of B1689 include: Open or short circuit in wiring harness; Faulty delay relay; Problems with the lighting control unit; Contact corrosion.

How do I fix a B1689 diagnostic trouble code?

To fix B1689: Check wiring harness for damage. Check delay relay. Diagnose the lighting control unit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1689?

Limited driving only, diagnose soon

How much does it cost to fix B1689?

The estimated repair cost for B1689 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat