OBD Guide
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B1608

Illuminated Entry Input Open Circuit

B1608 is an OBD-II diagnostic trouble code meaning: Illuminated Entry Input Open Circuit. Common causes: broken or damaged wiring harness, input light sensor malfunction. Estimated repair cost: $22–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Interior lighting does not work when doors are opened
  • The backlight turns on/off randomly
  • The backlight system does not respond to the key fob

Causes

  • Broken or damaged wiring harness
  • Input light sensor malfunction
  • Problems with the control unit
  • Corrosion or oxidation of contacts

How to Fix

  1. Check the integrity of the wiring harness
  2. Inspect connectors and contacts for damage
  3. Check the operation of the input backlight sensor
  4. Diagnose the control unit for errors
  5. Replace damaged components

Related codes

B1607B1609B1610

FAQ

What does the B1608 code mean?

B1608 is an OBD-II diagnostic trouble code that indicates: Illuminated Entry Input Open Circuit

What causes a B1608 error code?

The most common causes of B1608 include: Broken or damaged wiring harness; Input light sensor malfunction; Problems with the control unit; Corrosion or oxidation of contacts.

How do I fix a B1608 diagnostic trouble code?

To fix B1608: Check the integrity of the wiring harness. Inspect connectors and contacts for damage. Check the operation of the input backlight sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1608?

Limited driving only, diagnose soon

How much does it cost to fix B1608?

The estimated repair cost for B1608 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat