OBD Guide
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B1605

Lamp Anti-Theft Indicator Circuit Short To Battery

B1605 is an OBD-II diagnostic trouble code meaning: Lamp Anti-Theft Indicator Circuit Short To Battery. Common causes: damage to wire insulation in the indicator circuit, short circuit in control lamp. Estimated repair cost: $33–111.

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

Symptoms

  • The anti-theft system indicator flashes or stays on
  • Problems starting the engine (in some cases)
  • Activating immobilizer emergency mode

Causes

  • Damage to wire insulation in the indicator circuit
  • Short circuit in control lamp
  • Wiring harness damage
  • Malfunction of the immobilizer control unit
  • Corrosion or oxidation of contacts

How to Fix

  1. Check the condition of the control lamp and its circuit
  2. Inspect the wiring harness for damage
  3. Check resistance and continuity
  4. If necessary, replace damaged wires or lamp
  5. Check the operation of the immobilizer control unit

Related codes

B1600B1601B1602

FAQ

What does the B1605 code mean?

B1605 is an OBD-II diagnostic trouble code that indicates: Lamp Anti-Theft Indicator Circuit Short To Battery

What causes a B1605 error code?

The most common causes of B1605 include: Damage to wire insulation in the indicator circuit; Short circuit in control lamp; Wiring harness damage; Malfunction of the immobilizer control unit.

How do I fix a B1605 diagnostic trouble code?

To fix B1605: Check the condition of the control lamp and its circuit. Inspect the wiring harness for damage. Check resistance and continuity. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1605?

Limited driving only, diagnose soon

How much does it cost to fix B1605?

The estimated repair cost for B1605 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat