OBD Guide
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B1398

Driver Power Window One Touch Window Relay Circuit Failure

B1398 is an OBD-II diagnostic trouble code meaning: Driver Power Window One Touch Window Relay Circuit Failure. Common causes: faulty instantaneous lowering relay, damage to the door wiring harness. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–167 (est.)

Symptoms

  • Lack of instantaneous lowering of the driver's door window
  • Power window operation only when the button is held down
  • Clicking or no sound when the relay operates
  • May be accompanied by other window lift errors

Causes

  • Faulty instantaneous lowering relay
  • Damage to the door wiring harness
  • Oxidation of contacts in connectors
  • Malfunction of the power window control module
  • Circuit power problems
  • Mechanical faults of the window lift mechanism

How to Fix

  1. Check the serviceability of the instantaneous lowering relay (replace if necessary)
  2. Check the integrity of the wiring harness in the door and between the door and the body
  3. Check the condition of the contacts in the system connectors
  4. Measure the voltage in the relay control circuit
  5. If necessary, replace the power window control module
  6. Check the window lift mechanism for jamming

Related codes

B1397B1399B1401

FAQ

What does the B1398 code mean?

B1398 is an OBD-II diagnostic trouble code that indicates: Driver Power Window One Touch Window Relay Circuit Failure

What causes a B1398 error code?

The most common causes of B1398 include: Faulty instantaneous lowering relay; Damage to the door wiring harness; Oxidation of contacts in connectors; Malfunction of the power window control module.

How do I fix a B1398 diagnostic trouble code?

To fix B1398: Check the serviceability of the instantaneous lowering relay (replace if necessary). Check the integrity of the wiring harness in the door and between the door and the body. Check the condition of the contacts in the system connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1398?

Do not drive — repair immediately

How much does it cost to fix B1398?

The estimated repair cost for B1398 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat