How is fault code B1270 fixed?

- Cycle the left rear seat heater through low and high and note which indicators respond - Reseat and inspect the switch and rear seat harness connectors for corrosion and backed-out pins - Measure continuity of the high indicator control wire from the switch back to the module - Check the wire for unexpected battery voltage, which indicates a short to power - Repair the open or shorted wiring, or replace the switch panel if the indicator itself is open - Clear the code and confirm indicator and heating operation on the high setting

Servo Motor Potentiometer Defrost Circuit Short To Battery

Jump to the fix

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

Cycle the left rear seat heater through low and high and note which indicators respond

BBody
1Manufacturer-specific
2Body
70Sequence number

What does it mean?

B1270 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Left Rear Heated Seat Hi Indicator Control Circuit High .

Symptoms

The high setting indicator on the left rear seat heater switch never lights
The high heat setting may not be selectable
The seat heater may drop back to a lower setting or shut off by itself
Other indicators on the same panel can still work normally
The fault may appear only when the seat is occupied or adjusted

Likely causes

Open circuit in the high setting indicator control wire for the left rear seat heater
Indicator lamp inside the switch burnt out, leaving the circuit open
Switch connector unplugged or a terminal pushed out under the rear seat
Indicator wire shorted to battery voltage from a neighbouring circuit in the same loom
Corroded terminals after moisture soaked into the rear carpet
Failed indicator driver output inside the seat heater control module

How to fix it

Cycle the left rear seat heater through low and high and note which indicators respond
Reseat and inspect the switch and rear seat harness connectors for corrosion and backed-out pins
Measure continuity of the high indicator control wire from the switch back to the module
Check the wire for unexpected battery voltage, which indicates a short to power
Repair the open or shorted wiring, or replace the switch panel if the indicator itself is open
Clear the code and confirm indicator and heating operation on the high setting

Codes From the Same System

All Fault Codes

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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.