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Pinpoint Test AI: DTC B272F




Seats

Pinpoint Test AI: DTC B272F



Normal Operation

The passenger climate controlled seat blowers are located within the backrest and cushion Thermo-Electric Devices (TEDs). The Dual Climate Controlled Seat Module (DCSM) supplies voltage and ground to both blowers. The blowers are independently controlled by separate speed control circuits from the DCSM (Dual Climate Controlled Seat Module).

- DTC B272F (Passenger Ignition Run/Blower Circuit Short to Ground)- If either the blower voltage supply or return circuits are open (to both cushion and backrest blowers) or shorted to voltage, the DTC is set and after 4-6 seconds the DCSM (Dual Climate Controlled Seat Module) disables outputs to the passenger seat. The DTC also sets if the blower voltage supply or return circuit is open to only one blower when DCSM (Dual Climate Controlled Seat Module) supply voltage is less than 12 volts.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- HVAC module

- Backrest or cushion TED (Thermo-Electric Device)

- DCSM (Dual Climate Controlled Seat Module)

PINPOINT TEST AI : DTC B272F

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTICE: When taking measurements at Dual Climate Controlled Seat Module (DCSM) harness connectors, do not insert the electrical probes into the female connector pins. Inserting the probes into connector pins can cause intermittent or open electrical connections after reassembly resulting in Diagnostic Trouble Codes (DTCs) and system failure. Touching the tip of these connector pins is recommended instead.

AI1 CHECK THE TED (Thermo-Electric Device) BLOWER MOTOR CIRCUITS FOR A SHORT TO VOLTAGE

NOTE: If a seat equipped with a seat mounted side air bag is being serviced, the Supplemental Restraint System (SRS) must be depowered. Refer to Restraints and Safety Systems &/or Air Bag Systems.

NOTE: The air bag warning lamp illuminates when the Restraints Control Module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate an SRS (Supplemental Restraint System) fault.

NOTE: The SRS (Supplemental Restraint System) must be fully operational and free of faults before releasing the vehicle to the customer.

- Ignition OFF.

- WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.

For vehicles equipped with seat side air bags, carry out the following:
- Depower the SRS (Supplemental Restraint System). Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Restraints and Safety Systems &/or Air Bag Systems.

- Disconnect the passenger seat side air bag module C339.

- Connect the battery ground cable.

- Disconnect: DCSM (Dual Climate Controlled Seat Module) C3265C.

- Disconnect: Passenger Cushion TED (Thermo-Electric Device) C3040.

- Disconnect: Passenger Backrest TED (Thermo-Electric Device) C3039.

- Ignition ON.

- Measure the voltage between DCSM (Dual Climate Controlled Seat Module) C3265C, harness side and ground using the following chart.

DCSM (Dual Climate Controlled Seat Module) Connector Circuit C3265C-7 RHS08 (VT/WH) C3265C-8 CHS08 (BN/YE)






Is any voltage present on either circuit?

Yes
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C339. REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

No
GO to AI2.

AI2 CHECK THE PASSENGER TED (Thermo-Electric Device) BLOWER MOTOR CIRCUITS FOR AN OPEN

- Ignition OFF.

- Measure the resistance between DCSM (Dual Climate Controlled Seat Module) C3265C pins, harness side and cushion TED (Thermo-Electric Device) C3040 pins, harness side using the following chart.

DCSM (Dual Climate Controlled Seat Module) Connector Circuit Cushion TED (Thermo-Electric Device) Connector C3265C-7 RHS08 (VT/WH) C3040-4 C3265C-8 CHS08 (BN/YE) C3040-2






Are the resistances less than 5 ohms?

Yes
GO to AI3.

No
REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C339. REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

AI3 CHECK THE RESISTANCE OF THE PASSENGER CUSHION AND BACKREST TED (Thermo-Electric Device) BLOWER MOTORS

- NOTE: The ohmmeter must be connected with the positive lead to pin 2 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected can result in false readings and lead to incorrect identification of components that are not faulty.
Measure the resistance between:
- passenger cushion TED (Thermo-Electric Device) C3040 pins 2 and 4, component side.

- passenger backrest TED (Thermo-Electric Device) C3039 pins 2 and 4, component side.






Are the resistances between 4,000 and 10,000 ohms?

Yes
GO to AI4.

No
If the passenger cushion TED (Thermo-Electric Device) resistance is not between 4,000 and 10,000 ohms, INSTALL a new passenger cushion TED (Thermo-Electric Device). REFER to Seat Cushion - Front, Bucket Seat . CLEAR the DTCs. REPEAT the self-test.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C339. REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

If the passenger backrest TED (Thermo-Electric Device) resistance is not between 4,000 and 10,000 ohms, INSTALL a new passenger backrest TED (Thermo-Electric Device). REFER to Seat Backrest - Front, Bucket Seat . CLEAR the DTCs. REPEAT the self-test.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. CONNECT passenger seat side air bag module C339. REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

AI4 CHECK FOR CORRECT DCSM (Dual Climate Controlled Seat Module) OPERATION

- Disconnect all the DCSM (Dual Climate Controlled Seat Module) electrical connectors.

- Check the harness and component side connectors for the following:
- corrosion.
- damaged pins.
- pushed-out pins.

- Connect all the DCSM (Dual Climate Controlled Seat Module) electrical connectors and make sure they seat correctly.

- Start the engine.

- Operate the climate controlled seats and verify system operation.

- CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes).

- Enter the following diagnostic mode on the scan tool: Self Test- DCSM (Dual Climate Controlled Seat Module).

Is DTC B272F still present?

Yes
INSTALL a new DCSM (Dual Climate Controlled Seat Module). REFER to Dual Climate Controlled Seat Module (DCSM) . CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the self-test.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C339. REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all CMDTCs (Continuous Memory Diagnostic Trouble Codes). REPEAT the self-test.

For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. CONNECT driver seat side air bag module C3051 and passenger seat side air bag module C339. REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems.

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