OBD Guide

B318A

Left Rear Window Switch

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

Error B318A by Vehicle Brand