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AutoCodes - Generic - B272D

B272D Code - Passenger Differential Temperature Fault

- Code Popularity: 1,875 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC B272D?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Restricted Passenger Cushion or Backrest Blower Motor Filter
  • Faulty Passenger Cushion or Backrest Blower Motor
  • Passenger Cushion or Backrest Blower Motor harness is open or shorted
  • Passenger Cushion or Backrest Blower Motor circuit poor electrical connection
  • Faulty Seat Control Module E (SCME)
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How to Fix the DTC B272D?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B272D code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code B272D Description

The Seat Control Module E (SCME) is supplied voltage at all times, but the climate controlled seat system only operates with the engine running. The system can be operated with the ignition ON engine OFF by using a scan tool to bypass the climate controlled seat buttons on the touchscreen interface. When commanding a heat or cool mode operation in this manner, the climate controlled seat system only operates in 15 second intervals. Both voltage supply circuits are spliced together internal to the SCME, so if one circuit becomes open, both seats can still be operated. However, if a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat is disabled by the SCME.
Cabin air is drawn through and distributed to each of the blower motors located in the seat cushion and backrest. The blower motors then heat or cool the air. The air is then directed into the foam pad where it is distributed along the surface of the cushion and backrest of the seat. Once the system is activated, the SCME uses a set of flexible algorithms to control the heating/cooling modes and the blower speed dependant on the commanded climate controlled seat settings.
A differential fault occurs when the cushion and backrest blower motors on an affected seat are reporting very different temperatures to the SCME. This may result from an airflow restriction or a circuit fault of either blower motor area. If a blower motor is clear of obstruction and is operational, check the other blower motor and circuitry on the seat. It is important to note that a blower motor with a higher temperature may be operating correctly and not the area of concern. The other blower motor may be indicating a much lower temperature, causing the Diagnostic Trouble Code (DTC) to set.
If there is a temperature differential between the passenger backrest and cushion blower motor of 60 ° C (108 ° F) or more for more than 4 seconds, the blower motor is disconnected or the duct is blocked, this DTC sets. When this happens the first time in a key cycle, the SCME puts the passenger seat system into recovery mode (see principles of operation). If the system is able to recover, it functions normally. If the system is able to recover and it occurs a second time in the same key cycle, the SCME shuts down the passenger seat system.

OBDII Code B272D - Passenger Differential Temperature Fault - AutoCodes.com
B272D Code - Passenger Differential Temperature Fault

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