OBD Guide
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B1402

Driver Power Window Down Switch Circuit Failure

B1402 is an OBD-II diagnostic trouble code meaning: Driver Power Window Down Switch Circuit Failure. Common causes: open or short circuit in wiring harness, oxidation of switch contacts. Estimated repair cost: $11–111.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–111 (est.)

Symptoms

  • Driver's side window down switch not working
  • Intermittent operation of the window regulator
  • The glass goes down only with other switches

Causes

  • Open or short circuit in wiring harness
  • Oxidation of switch contacts
  • Mechanical wear on the switch
  • Problems with the power window control unit

How to Fix

  1. Check the condition of the switch connectors and contacts
  2. Check the integrity of the wiring harness with a multimeter
  3. Replace the faulty switch if necessary
  4. Check the operation of the power window control unit

Related codes

B1401B1403B1404

FAQ

What does the B1402 code mean?

B1402 is an OBD-II diagnostic trouble code that indicates: Driver Power Window Down Switch Circuit Failure

What causes a B1402 error code?

The most common causes of B1402 include: Open or short circuit in wiring harness; Oxidation of switch contacts; Mechanical wear on the switch; Problems with the power window control unit.

How do I fix a B1402 diagnostic trouble code?

To fix B1402: Check the condition of the switch connectors and contacts. Check the integrity of the wiring harness with a multimeter. Replace the faulty switch if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1402?

Limited driving only, diagnose soon

How much does it cost to fix B1402?

The estimated repair cost for B1402 is $11–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat