OBD Guide
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B1594

Autolamp Delay Decrease Circuit Short To Ground

B1594 is an OBD-II diagnostic trouble code meaning: Autolamp Delay Decrease Circuit Short To Ground. Common causes: wiring harness damage, delay relay fault. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • No headlight delay
  • The headlights turn on immediately after the engine starts
  • Flashing headlights

Causes

  • Wiring harness damage
  • Delay relay fault
  • Short circuit in the circuit
  • Problems with the lighting control unit

How to Fix

  1. Check wiring harness for damage
  2. Check delay relay
  3. Check circuit for short circuit
  4. Replace faulty components

Related codes

B1593B1595

FAQ

What does the B1594 code mean?

B1594 is an OBD-II diagnostic trouble code that indicates: Autolamp Delay Decrease Circuit Short To Ground

What causes a B1594 error code?

The most common causes of B1594 include: Wiring harness damage; Delay relay fault; Short circuit in the circuit; Problems with the lighting control unit.

How do I fix a B1594 diagnostic trouble code?

To fix B1594: Check wiring harness for damage. Check delay relay. Check circuit for short circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1594?

Limited driving only, diagnose soon

How much does it cost to fix B1594?

The estimated repair cost for B1594 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat