Pinpoint Test D: The Heated Seat is Inoperative/Does Not Operate Correctly - Passenger
Seats
Pinpoint Tests
Pinpoint Test D: The Heated Seat is Inoperative/Does Not Operate Correctly - Passenger
Refer to Wiring Diagram Set 119 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
Voltage is supplied from Smart Junction Box (SJB) circuit CBP43 to the heated seat relay coil. When the heated seat switch button is pressed, the HVAC module supplies ground to the passenger heated seat relay coil on circuit CHS30. When the passenger heated seat relay is energized, battery voltage is supplied from SJB circuit SBP18 (YE/RD) to passenger heater mat circuit CHS12. The passenger heater mats are directly connected to ground circuit GD182 completing the electrical circuit to heat the seat.
On vehicles equipped with navigation, the Front Controls Interface Module (FCIM) communicates the heated seat system on/off requests to the HVAC module using the communication network. The following is required for heated seat system operation:
- The engine must be running (except Hybrid).
- The HVAC module must be communicating correctly.
- If equipped with navigation, the FCIM must be communicating correctly.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Heated seat relay
- Heater mat
- FCIM (vehicles with navigation)
- HVAC module
PINPOINT TEST D: THE HEATED SEAT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - PASSENGER
NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition is ON.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
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D1 CHECK FOR HEATED SEAT INDICATOR ILLUMINATION
- Operate the passenger heated seat and check the indicator for correct illumination.
- Does the heated seat indicator illuminate correctly?
Yes
If equipped with navigation, GO to D2.
If not equipped with navigation, GO to D3.
No
VERIFY the climate control system is operating correctly. REFER to Heating and Air Conditioning to diagnose the inoperative climate control system.
If equipped with navigation and the indicator does not illuminate, GO to D2.
If equipped with navigation and the indicator briefly illuminates but does not remain on, GO to D3.
If not equipped with navigation, INSTALL a new HVAC module. TEST the system for normal operation.
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D2 CHECK THE FCIM FOR COMMUNICATION WITH THE SCAN TOOL AND RETRIEVE DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - FCIM.
- Does the FCIM communicate with the scan tool and are any DTCs present?
Yes
REFER to the Front Controls Interface Module (FCIM) DTC Chart in Accessories and Optional Equipment for diagnosis. Front Controls Interface Module (FCIM) DTC Chart
No
If the FCIM communicates with the scan tool and the heated seat indicator illuminates correctly, GO to D3.
If the FCIM communicates with the scan tool but heated seat indicators do not illuminate correctly, INSTALL a new FCIM. REFER to Accessories and Optional Equipment. TEST the system for normal operation.
If the FCIM does not communicate with the scan tool, REFER to Information Bus for diagnosis.
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D3 RETRIEVE HVAC MODULE DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - HVAC Module.
- Are any DTCs present?
Yes
If DTC B12AD or B1032:12 is present, GO to D4.
If DTC B12AE or B1032:14 is present, GO to D5.
For any other DTC, REFER to the HVAC Module DTC Chart for diagnosis. Diagnostic Trouble Code Tests and Associated Procedures
No
GO to D7.
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D4 CHECK THE PASSENGER HEATED SEAT REQUEST CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Restraint Systems. Supplemental Restraint System (SRS) Depowering and Repowering
- Disconnect: Passenger Seat Side Air Bag C337.
- Disconnect: Passenger Safety Belt Buckle Pretensioner C3202.
- Disconnect: HVAC Module C2357A or C2356B (C2356A hybrid).
- Disconnect: Passenger Heated Seat Relay C3254.
- 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.
- Connect the battery ground cable. Refer to Battery.
- Ignition ON.
- Measure the voltage between passenger heated seat relay C3254-3, circuit CHS30 (GY/YE), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3202 and passenger seat side air bag C337.
REPOWER the SRS. REFER to Restraint Systems.
No
INSTALL a new passenger heated seat relay. RECONNECT all connectors and REPEAT the self-test. If the DTC is retrieved again, INSTALL a new HVAC module. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3202 and passenger seat side air bag C337.
REPOWER the SRS. REFER to Restraint Systems.
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D5 CHECK THE PASSENGER HEATED SEAT REQUEST CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Restraint Systems. Supplemental Restraint System (SRS) Depowering and Repowering
- Disconnect: Passenger Seat Side Air Bag C337.
- Disconnect: Passenger Safety Belt Buckle Pretensioner C3202.
- Disconnect: Passenger Heated Seat Relay C3201.
- Disconnect: HVAC Module C2357A or C2356B (C2356A hybrid).
- Measure the resistance between passenger heated seat relay C3254-3, circuit CHS30 (GY/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to D6.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3202 and passenger seat side air bag C337.
REPOWER the SRS. REFER to Restraint Systems.
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D6 CHECK THE PASSENGER HEATED SEAT REQUEST CIRCUIT FOR AN OPEN
- For vehicles equipped with manual temperature control, measure the resistance between passenger heated seat relay C3254-3, circuit CHS30 (GY/YE), harness side and HVAC module C2357A-5, circuit CHS30 (GY/YE), harness side.
- For hybrid vehicles, measure the resistance between passenger heated seat relay C3254-3, circuit CHS30 (GY/YE), harness side and HVAC module C2356A-4, circuit CHS30 (GY/YE), harness side.
- For non-hybrid vehicles equipped with automatic temperature control, measure the resistance between passenger heated seat relay C3254-3, circuit CHS30 (GY/YE), harness side and HVAC module C2356B-3, circuit CHS30 (GY/YE), harness side.
- Is the resistance less than 5 ohms?
Yes
CHECK the relay and HVAC module electrical connectors and pins for damage. REPAIR as necessary. RECONNECT the connectors. REPEAT the self-test. If the DTC is retrieved again, INSTALL a new HVAC module. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3202 and passenger seat side air bag C337.
REPOWER the SRS. REFER to Restraint Systems.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3202 and passenger seat side air bag C337.
REPOWER the SRS. REFER to Restraint Systems.
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D7 CHECK THE HEATER CIRCUIT FOR VOLTAGE
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Restraint Systems. Supplemental Restraint System (SRS) Depowering and Repowering
- Disconnect: Passenger Seat Side Air Bag C337.
- Disconnect: Passenger Safety Belt Buckle Pretensioner C3202.
- Disconnect: Passenger Cushion Heater Mat C3254.
- 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.
- Connect the battery ground cable. Refer to Battery.
- Start the engine.
- Press the passenger heated seat switch on and measure the voltage between passenger seat heater mat C3284-2, circuit CHS12 (YE/GN), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to D11.
No
GO to D8.
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D8 CHECK THE HEATED SEAT RELAY
- Ignition OFF.
- Disconnect: Passenger Heated Seat Relay C3254.
- Install a test relay in the passenger heated seat relay socket.
- Start the engine.
- Press the passenger heated seat switch on and measure the voltage between passenger seat heater mat C3284-2, circuit CHS12 (YE/GN), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
INSTALL a new heated seat relay. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3202 and passenger seat side air bag C337.
REPOWER the SRS. REFER to Restraint Systems.
No
DISCONNECT the test relay and GO to D9.
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D9 CHECK FOR VOLTAGE TO THE PASSENGER HEATED SEAT RELAY
- Measure the voltage between:
- passenger heated seat relay C3254-5, circuit SBP18 (YE/RD), harness side and ground.
- passenger heated seat relay C3254-1, circuit CBP43 (GY), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to D10.
No
VERIFY Smart Junction Box (SJB) fuses 18 (20A) and 43 (10A) are OK. If OK, REPAIR the circuit(s). If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. Diagrams By Number
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3202 and passenger seat side air bag C337.
REPOWER the SRS. REFER to Restraint Systems.
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D10 CHECK THE HEATER CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between passenger heated seat relay C3254-4, circuit CHS12 (YE/GN), harness side and passenger cushion heater mat C3284-2, circuit CHS12 (YE/GN), harness side.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new HVAC module. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3202 and passenger seat side air bag C337.
REPOWER the SRS. REFER to Restraint Systems.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3202 and passenger seat side air bag C337.
REPOWER the SRS. REFER to Restraint Systems.
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D11 CHECK THE HEATER GROUND CIRCUIT FOR AN OPEN
- Measure the resistance between passenger seat cushion heater mat C3284-1, circuit GD182 (BK/GY), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to D12.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3202 and passenger seat side air bag C337.
REPOWER the SRS. REFER to Restraint Systems.
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D12 CHECK THE BACKREST HEATER MAT FOR AN OPEN
- Disconnect: Passenger Backrest Heater Mat Electrical Connector.
- Measure the resistance between passenger backrest heater mat electrical connector pins 1 and 2, component side.
- Is the resistance between 0.8 and 1.5 ohms?
Yes
INSTALL a new cushion heater mat. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3202 and passenger seat side air bag C337.
REPOWER the SRS. REFER to Restraint Systems.
No
INSTALL a new backrest heater mat. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT passenger seat safety belt buckle pretensioner C3202 and passenger seat side air bag C337.
REPOWER the SRS. REFER to Restraint Systems.
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