OBD Guide
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B318A

Left Rear Window Switch

B318A is an OBD-II diagnostic trouble code meaning: Left Rear Window Switch. Common causes: left rear window switch malfunction, problems with the door wiring harness. Estimated repair cost: $22–111.

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

Symptoms

  • Left rear window lift does not respond to commands
  • Intermittent operation of the glass lift
  • Using a switch may cause other electrical problems

Causes

  • Left rear window switch malfunction
  • Problems with the door wiring harness
  • Switch contact corrosion
  • Door control unit malfunction

How to Fix

  1. Check the switch for physical damage or corrosion
  2. Inspect the door wiring harness for damage.
  3. Check the switch contacts and clean them if necessary
  4. Replace the switch if it is faulty
  5. Check and replace the door control unit if necessary

Related codes

B318BB318C

Error B318A by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the B318A code mean?

B318A is an OBD-II diagnostic trouble code that indicates: Left Rear Window Switch

What causes a B318A error code?

The most common causes of B318A include: Left rear window switch malfunction; Problems with the door wiring harness; Switch contact corrosion; Door control unit malfunction.

How do I fix a B318A diagnostic trouble code?

To fix B318A: Check the switch for physical damage or corrosion. Inspect the door wiring harness for damage.. Check the switch contacts and clean them if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B318A?

Limited driving only, diagnose soon

How much does it cost to fix B318A?

The estimated repair cost for B318A is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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