Pinpoint Test Ag : DTC B272D
WARNING: This page is about a different car, the 2015 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
- AG1 CHECK THE SCME (FRONT SEAT CLIMATE CONTROL MODULE) FOR ON-DEMAND DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, perform the SCME self-test.
Was DTC B272A or B272B, retrieved on-demand during the self-test?
Yes For DTC B272A, GO to Pinpoint Test AD For DTC B272B, GO to Pinpoint Test AE No GO to AG2 - AG2 MONITOR SCME (FRONT SEAT CLIMATE CONTROL MODULE) BLOWER MOTOR TEMPERATURE PARAMETER IDENTIFICATIONS (PIDS)
- Using a diagnostic scan tool, monitor the following SCME Parameter Identifications (PIDs):
- Passenger Cushion Thermal Electric Device (TED) Temperature (PCSHTMP)
- Passenger Back (TED) Temperature (PBKTMP)
- Seat cushion thermal electric device temperature (CSHTEMP)
- Seat back thermal electric device temperature (BKTMP)
- Monitor blower motor temperature Parameter Identifications (PIDs) with the climate controlled seats OFF. Compare the PID values of the driver seat to those of the front passenger seat, this can help identify if there is a concern with the passenger seat cushion or backrest PID value readings.
NOTE: Make sure the temperature of the climate controlled seats has stabilized before monitoring the Parameter Identifications (PIDs). Not allowing stabilization can cause incorrect readings and lead to incorrect identification of components that are not faulty.Are both passenger seat blower motor temperature Parameter Identifications (PIDs) within 10 ° C (18 ° F) of the ambient temperature?
Yes GO to AG3 No If the passenger seat cushion PID varies 10 ° C (18 ° F) or more from ambient temperature, GO to AG16 If the passenger seat backrest PID varies 10 ° C (18 ° F) or more from ambient temperature, GO to AG32 - Using a diagnostic scan tool, monitor the following SCME Parameter Identifications (PIDs):
- AG3 CONFIRM THE FAULT IS IN THE SEAT CUSHION OR THE BACKREST
- Ignition OFF.
- Start the engine.
- After cycling the ignition and with the engine running, set the passenger seat to high heat. Allow the seat to heat for at least 15 minutes while monitoring the blower motor temperature Parameter Identifications (PIDs) of the passenger seat.
NOTE: A crushed seat cushion foam pad may be the cause of the fault. It may be necessary to sit on the seat or place something of reasonable size and weight on the seat to recreate the fault.Do the passenger seat cushion blower motor and backrest blower motor Parameter Identifications (PIDs) vary more than 60 ° C (108 ° F) from each other?
Yes If the passenger seat cushion PID is 60 ° C (108 ° F) hotter than the backrest PID, GO to AG5 If the passenger seat backrest PID is 60 ° C (108 ° F) hotter than the cushion PID, GO to AG20 No GO to AG4 - AG4 CHECK THE BLOWER MOTOR COOLING PERFORMANCE
- Check the blower motor cooling performance on the affected seat. Refer to Component Test - Blower Motor Cooling Performance .
Did the blower motors pass the component test?
Yes The DTC may have been set by extreme cabin temperatures or excessive sunload on the seat causing the system to enter recovery mode. Occupant size and weight characteristics can also be a factor. CLEAR the Diagnostic Trouble Codes (DTCs). REPEAT the self-test. TEST the system for normal operation. If a concern cannot be found or duplicated, RETURN the vehicle to the customer. No CHECK the affected seat cushion or backrest for correct installation of the climate controlled seat components (blower motor, air ducts and foam pad). CHECK for airflow restrictions (blower motor inlets and outlets, filters and ducts) and REPAIR as needed. CHECK for an intermittent wiring fault. REPAIR as needed. CLEAR the Diagnostic Trouble Codes (DTCs). REPEAT the self-test. - AG5 CHECK FOR CORRECT BLOWER MOTOR INSTALLATION AND FOR CRUSHED FOAM
- Ignition OFF.
- Remove the seat. REFER to: Front Seat .
- Remove the seat cushion trim cover. REFER to: Front Seat Cushion Cover .
- Inspect the seat cushion for the following:
- Cushion blower obstructed
- Blower filter restricted or plugged
- Blower motor correctly installed
- Seat cushion foam pad crushed or restricted
Is the blower motor correctly installed and the foam pad OK?
Yes GO to AG6 No Correctly INSTALL the cushion blower motor or INSTALL a new seat cushion foam pad. - AG6 CHECK BACKREST BLOWER MOTOR RETURN CIRCUIT FOR A SHORT TO VOLTAGE
- REFER to: Supplemental Restraint System (SRS) Depowering .
- Disconnect: Passenger Side Airbag In-line C3053 .
- Position the passenger seat in the vehicle and connect the seat-to-floor connectors.
- Disconnect: SCME C3265A .
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C3265A-D Ground
Is any voltage present?
Yes REPAIR the circuit. GO to AG36 No GO to AG7 - AG7 CHECK BACKREST BLOWER MOTOR FEED CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Measure:
Positive Lead Measurement / Action Negative Lead C3265A-C Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to AG8 No REPAIR the circuit. GO to AG36 - AG8 CHECK THE RESISTANCE OF THE BACKREST BLOWER MOTOR AND WIRING
Are the resistances between 0.9 and 10 ohms?
Yes GO to AG10 No GO to AG9 - AG9 CHECK THE RESISTANCE OF THE BACKREST BLOWER MOTOR
- Disconnect: Passenger Backrest Blower Motor C3039 .
- Measure the component side resistance
between:
Positive Lead Measurement / Action Negative Lead
C3039-1, Component Side
C3039-2, Component Side
Are the resistances between 0.9 and 10 ohms?
Yes REPAIR circuit CHS06 (BU/BN) or RHS06 (WH) for an open or high resistance. GO to AG36 No INSTALL a new backrest blower motor. REFER to: Front Seat Backrest Blower Motor . GO to AG36 - AG10 CHECK BLOWER CIRCUIT AND SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: SCME C3265C .
- Ignition ON.
Is any voltage present?
Yes REPAIR the circuit in question. GO to AG36 No GO to AG11 - AG11 CHECK BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
Are the resistances greater than 10, 000 ohms?
Yes GO to AG12 No REPAIR the circuit in question. GO to AG36 - AG12 CHECK THE BLOWER AND WIRING
- Measure:
Positive Lead Measurement / Action Negative Lead C3265C-8 C3265C-7
NOTE: The ohmmeter must be connected with the positive lead to pin 8 and the negative lead to pin 7 when measuring. Ohmmeter leads incorrectly connected results in false readings and leads to incorrect identification of components that are not faulty.Is the resistance between 4, 000 and 10, 000 ohms?
Yes GO to AG14 No GO to AG13 - Measure:
- AG13 CHECK THE BLOWER RESISTANCE
- Disconnect: Passenger Cushion Blower Motor C3040 .
- Measure the component side resistance
between:
Positive Lead Measurement / Action Negative Lead
C3040-3, Component Side
C3040-4, Component Side
NOTE: The ohmmeter must be connected with the positive lead to pin 3 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected results in false readings and leads to incorrect identification of components that are not faulty.Is the resistance between 4, 000 and 10, 000 ohms?
Yes REPAIR the circuit in question. GO to AG36 No INSTALL a new passenger seat cushion blower motor. REFER to: Front Seat Cushion Blower Motor . GO to AG36 - AG14 CHECK THE BLOWER SPEED CONTROL AND CIRCUIT RESISTANCE
- Measure:
Positive Lead Measurement / Action Negative Lead C3265C-3 C3265C-7
NOTE: The ohmmeter must be connected with the positive lead to pin 3 and the negative lead to pin 7 when measuring. Ohmmeter leads incorrectly connected results in false readings and leads to incorrect identification of components that are not faulty.Is the resistance between 240K and 400K ohms?
Yes GO to AG16 No GO to AG15 - Measure:
- AG15 CHECK THE BLOWER SPEED CONTROL RESISTANCE
- Disconnect: Passenger Cushion Blower Motor C3040 .
- Measure the component side resistance
between:
Positive Lead Measurement / Action Negative Lead
C3040-7, Component Side
C3040-4, Component Side
NOTE: The ohmmeter must be connected with the positive lead to pin 7 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected results in false readings and leads to incorrect identification of components that are not faulty.Is the resistance between 240K and 400K ohms?
Yes REPAIR the circuit in question. GO to AG36 No INSTALL a new passenger seat cushion blower motor. REFER to: Front Seat Cushion Blower Motor . GO to AG36 - AG16 CHECK THERMISTOR CIRCUIT FOR A SHORT TO VOLTAGE
- REFER to: Supplemental Restraint System (SRS) Depowering .
- Disconnect: Passenger Side Airbag In-line C3053 .
- Disconnect: SCME C3265B .
- Measure:
Positive Lead Measurement / Action Negative Lead C3265B-2 Ground
Is any voltage present?
Yes REPAIR the circuit. GO to AG36 No GO to AG17 - AG17 CHECK THERMISTOR CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Measure:
Positive Lead Measurement / Action Negative Lead C3265B-2 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to AG18 No REPAIR the circuit. GO to AG36 - AG18 CHECK THE BLOWER MOTOR THERMISTOR AND WIRING RESISTANCE AT THE SCME (FRONT SEAT CLIMATE CONTROL MODULE)
- Compare the measured resistance value with the following table:
Ambient Temperature Resistance 0-10 ° C (32-50 ° F) 2, 782-1, 663 ohms 10-20 ° C (50-68 ° F) 1, 837-1, 140 ohms 20-30 ° C (68-86 ° F) 1, 260-806 ohms 30-40 ° C (86-104 ° F) 893-570 ohms 40-50 ° C (104-122 ° F) 630-428 ohms
Is the resistance within the limits indicated?
Yes GO to AG35 No GO to AG19 - Compare the measured resistance value with the following table:
- AG19 CHECK THE BLOWER MOTOR THERMISTOR RESISTANCE
- Disconnect: Passenger Cushion Blower Motor C3040 .
- Measure the component side resistance
between:
Positive Lead Measurement / Action Negative Lead
C3040-5, Component Side
C3040-8, Component Side
- Compare the measured resistance value with the following table:
Ambient Temperature Resistance 0-10 ° C (32-50 ° F) 2, 782-1, 663 ohms 10-20 ° C (50-68 ° F) 1, 837-1, 140 ohms 20-30 ° C (68-86 ° F) 1, 260-806 ohms 30-40 ° C (86-104 ° F) 893-570 ohms 40-50 ° C (104-122 ° F) 630-428 ohms
Is the resistance within the limits indicated?
Yes REPAIR circuit VHS27 (WH/OG) or RHS10 (BU/OG) for an open or high resistance. GO to AG36 No INSTALL a new passenger seat cushion blower motor. REFER to: Front Seat Cushion Blower Motor . GO to AG36 - AG20 CHECK FOR CORRECT BLOWER MOTOR INSTALLATION AND FOR CRUSHED FOAM
- Ignition OFF.
- Remove the passenger seat. REFER to: Front Seat .
- Remove the passenger seat backrest cover. REFER to: Front Seat Backrest Cover .
- Inspect the passenger seat backrest for the following:
- Backrest blower obstructed
- Blower filter restricted or plugged
- Blower motor correctly installed
- Seat backrest foam pad crushed or restricted
Is the blower motor correctly installed and the foam pad OK?
Yes GO to AG21 No Correctly INSTALL the backrest blower motor or INSTALL a new seat backrest foam pad. INSTALL the seat. GO to AG36 - AG21 CHECK CUSHION BLOWER MOTOR CIRCUIT FOR A SHORT TO VOLTAGE
- REFER to: Supplemental Restraint System (SRS) Depowering .
- Disconnect: Passenger Side Airbag In-line C3053 .
- Position the passenger seat in the vehicle and connect the seat-to-floor connectors.
- Disconnect: SCME C3265A .
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C3265A-B Ground
Is any voltage present?
Yes REPAIR the circuit. GO to AG36 No GO to AG22 - AG22 CHECK CUSHION BLOWER MOTOR FEED CIRCUIT FOR A SHORT TO GROUND
- REFER to: Supplemental Restraint System (SRS) Depowering .
- Measure:
Positive Lead Measurement / Action Negative Lead C3265A-A Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to AG23 No REPAIR the circuit. GO to AG36 - AG23 CHECK THE RESISTANCE OF THE CUSHION BLOWER MOTOR AND WIRING
Is the resistance between 0.9 and 10 ohms?
Yes GO to AG25 No GO to AG24 - AG24 CHECK THE CUSHION BLOWER MOTOR RESISTANCE
- Disconnect: Passenger Cushion Blower Motor C3040 .
- Measure the component side resistance
between:
Positive Lead Measurement / Action Negative Lead
C3040-1, Component Side
C3040-2, Component Side
Is the resistance between 0.9 and 10 ohms?
Yes REPAIR the circuit(s) in question. GO to AG36 No INSTALL a new passenger seat cushion blower motor. REFER to: Front Seat Cushion Blower Motor . GO to AG36 - AG25 CHECK BLOWER CIRCUIT AND SPEED CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: SCME C3265C .
- Ignition ON.
Is any voltage present?
Yes REPAIR the circuit in question. GO to AG36 No GO to AG26 - AG26 CHECK BLOWER AND SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
Are the resistances greater than 10, 000 ohms?
Yes GO to AG27 No REPAIR the circuit in question. GO to AG36 - AG27 CHECK THE BLOWER AND WIRING RESISTANCE
- Measure:
Positive Lead Measurement / Action Negative Lead C3265C-8 C3265C-7
NOTE: The ohmmeter must be connected with the positive lead to pin 8 and the negative lead to pin 7 when measuring. Ohmmeter leads incorrectly connected results in false readings and leads to incorrect identification of components that are not faulty.Is the resistance between 4, 000 and 10, 000 ohms?
Yes GO to AG29 No GO to AG28 - Measure:
- AG28 CHECK THE BLOWER RESISTANCE
- Disconnect: Passenger Backrest Blower Motor C3039 .
- Measure the component side resistance
between:
Positive Lead Measurement / Action Negative Lead
C3039-3, Component Side
C3039-4, Component Side
NOTE: The ohmmeter must be connected with the positive lead to pin 3 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected results in false readings and leads to incorrect identification of components that are not faulty.Is the resistance between 4, 000 and 10, 000 ohms?
Yes REPAIR the circuit(s) in question. GO to AG36 No INSTALL a new backrest blower motor. REFER to: Front Seat Backrest Blower Motor . GO to AG36 - AG29 CHECK THE BLOWER SPEED CONTROL AND CIRCUIT RESISTANCE
- Measure:
Positive Lead Measurement / Action Negative Lead C3265C-4 C3265C-7
NOTE: The ohmmeter must be connected with the positive lead to pin 4 and the negative lead to pin 7 when measuring. Ohmmeter leads incorrectly connected results in false readings and leads to incorrect identification of components that are not faulty.Is the resistance between 240K and 400K ohms?
Yes GO to AG31 No GO to AG30 - Measure:
- AG30 CHECK THE BLOWER SPEED CONTROL RESISTANCE
- Disconnect: Passenger Backrest Blower Motor C3039 .
- Measure the component side resistance
between:
Positive Lead Measurement / Action Negative Lead
C3039-7, Component Side
C3039-4, Component Side
NOTE: The ohmmeter must be connected with the positive lead to pin 7 and the negative lead to pin 4 when measuring. Ohmmeter leads incorrectly connected results in false readings and leads to incorrect identification of components that are not faulty.Is the resistance between 240K and 400K ohms?
Yes REPAIR the circuit(s) in question. GO to AG36 No INSTALL a new backrest blower motor. REFER to: Front Seat Backrest Blower Motor . GO to AG36 - AG31 CHECK THERMISTOR CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect: SCME C3265B .
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C3265B-4 Ground
Is any voltage present?
Yes REPAIR the circuit. GO to AG36 No GO to AG32 - AG32 CHECK THERMISTOR CIRCUIT FOR A SHORT TO GROUND
- REFER to: Supplemental Restraint System (SRS) Depowering .
- Disconnect: Passenger Side Airbag In-line C3053 .
- Disconnect: SCME C3265B .
- Measure:
Positive Lead Measurement / Action Negative Lead C3265B-4 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to AG33 No REPAIR the circuit. GO to AG36 - AG33 CHECK THE BLOWER MOTOR THERMISTOR AND WIRING RESISTANCE
- Compare the measured resistance value with the following table:
Ambient Temperature Resistance 0-10 ° C (32-50 ° F) 2, 782-1, 663 ohms 10-20 ° C (50-68 ° F) 1, 837-1, 140 ohms 20-30 ° C (68-86 ° F) 1, 260-806 ohms 30-40 ° C (86-104 ° F) 893-570 ohms 40-50 ° C (104-122 ° F) 630-428 ohms
Is the resistance within the limits indicated?
Yes GO to AG35 No GO to AG34 - Compare the measured resistance value with the following table:
- AG34 CHECK THE BLOWER MOTOR THERMISTOR RESISTANCE
- Disconnect: Passenger Backrest Blower Motor C3039 .
- Measure the component side resistance
between:
Positive Lead Measurement / Action Negative Lead
C3039-5, Component Side
C3039-8, Component Side
- Compare the measured resistance value with the following table:
Ambient Temperature Resistance 0-10 ° C (32-50 ° F) 2, 782-1, 663 ohms 10-20 ° C (50-68 ° F) 1, 837-1, 140 ohms 20-30 ° C (68-86 ° F) 1, 260-806 ohms 30-40 ° C (86-104 ° F) 893-570 ohms 40-50 ° C (104-122 ° F) 630-428 ohms
Is the resistance within the limits indicated?
Yes REPAIR circuit VHS36 (YE/BU) or RHS20 (GN/BU) for an open or high resistance. GO to AG36 No INSTALL a new backrest blower motor. REFER to: Front Seat Backrest Blower Motor . GO to AG36 - AG35 CHECK THE SCME (FRONT SEAT CLIMATE CONTROL MODULE) OPERATION
- Ignition OFF.
- Disconnect and inspect all of the SCME connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins as necessary
- pushed-out pins - install new pins as necessary
- Reconnect the SCME connectors. Make sure they seat and latch correctly.
- Reconnect all previously disconnected connectors.
NOTE: Do not reconnect Passenger Side Airbag In-line C3053 at this time.- Ignition ON.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new SCME. REFER to: Front Seat Climate Control Module [SCME] . GO to AG36 No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. GO to AG36 - AG36 VERIFY THE SRS (SUPPLEMENTAL RESTRAINT SYSTEM) PROVES OUT SUCCESSFULLY
- REFER to: Supplemental Restraint System (SRS) Depowering .
- Connect: Passenger Side Airbag In-line C3053 .
- Connect all previously disconnected connectors.
- REFER to: Supplemental Restraint System (SRS) Repowering .
Did the SRS prove out successfully?
Yes Repair is complete. RETURN the vehicle to the customer. No REFER to: Airbag Supplemental Restraint System (SRS) .
WARNING:
Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.