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Servo Motor Potentiometer Defrost Circuit Failure

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Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

Test the left rear seat heater on each setting and note whether the low indicator lights

  • BBody
  • 1Manufacturer-specific
  • 2Body
  • 68Sequence number

What does it mean?

B1268 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Left Rear Heated Seat Lo Indicator Control Circuit High .

Symptoms

  • The low heat indicator on the left rear seat heater switch never lights
  • The low setting may be unavailable or the heater switches itself off
  • Other indicators on the same switch panel may still work
  • Right rear seat heating is normally unaffected
  • The fault can be intermittent and appear when driving over rough roads

Likely causes

  • Open circuit in the indicator control wire between the module and the left rear seat heater switch
  • Connector unplugged or a terminal backed out under the rear seat
  • Burnt out indicator lamp inside the switch assembly, leaving the circuit open
  • Indicator control wire shorted to battery voltage from an adjacent circuit
  • Corroded terminals in the rear seat harness after moisture reached the carpet
  • Fault in the module output that drives the seat heater indicators

How to fix it

  1. Test the left rear seat heater on each setting and note whether the low indicator lights
  2. Check that the switch and rear seat harness connectors are fully seated and free of corrosion
  3. Measure continuity of the indicator control wire from the switch back to the module connector
  4. Check for battery voltage on the control wire while the indicator is commanded off, which would indicate a short to power
  5. Repair the open or shorted wiring, or replace the switch panel if the indicator itself is open
  6. Clear the code and confirm that both the indicator and the heating element work

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.