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 passenger 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 to the passenger heater mats on circuit CHS12. The heater mats are directly connected to ground circuit GD182 completing the electrical circuit to heat the seat.
- The engine must be running (except Hybrid turn the ignition ON).
- The HVAC module must be communicating correctly.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Heated seat relay
- Heater mat
- 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
- Start the engine (except Hybrid, turn the ignition ON).
- Press the passenger heated seat button to activate the heated seat.
- Does the indicator illuminate?
Yes
GO to D2.
No
VERIFY the climate control system is operating correctly. REFER to Climate Control System - General Information and Diagnostics Testing and Inspection or Climate Control System - General Information and Diagnostics - Hybrid Testing and Inspection to diagnose the inoperative climate control system.
If the climate control system is operating correctly, GO to D14.
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D2 RETRIEVE HVAC MODULE DTCs
NOTE: The engine must be running (except Hybrid, turn the ignition on).
- 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 D3.
If DTC B12AE or B1032:14 is present, GO to D4.
For all other HVAC Module DTCs, REFER to the HVAC Module DTC Chart for diagnosis. Diagnostic Trouble Code Tests and Associated Procedures
No
GO to D8.
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D3 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 Supplemental Restraint System 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, Mounting and Cables Battery Disconnect.
- 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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
GO to D14.
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D4 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 Supplemental Restraint System 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 D5.
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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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D5 CHECK FOR VOLTAGE TO THE PASSENGER HEATED SEAT RELAY COIL
- 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, Mounting and Cables Battery Disconnect.
- Ignition ON.
- Measure the voltage between passenger heated seat relay C3254-1, circuit CBP43 (GY), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to D6.
No
VERIFY Smart Junction Box (SJB) fuse 43 (10A) is OK. If OK, REPAIR the circuit for an open. 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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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D6 CHECK THE PASSENGER HEATED SEAT REQUEST CIRCUIT FOR AN OPEN
- Ignition OFF.
- 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 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
GO to D7.
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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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D7 CHECK THE PASSENGER HEATED SEAT RELAY FOR AN OPEN
- Install a test relay in the passenger heated seat relay C3254.
- Start the engine (except Hybrid, turn the ignition ON).
- Enter the following diagnostic mode on the scan tool: Self Test - HVAC Module.
- Is DTC B1032:14 or B12AE present on-demand during self-test?
Yes
GO to D14.
No
INSTALL a new passenger 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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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D8 CHECK FOR VOLTAGE TO THE PASSENGER HEATED SEAT RELAY
- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Supplemental Restraint System 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 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, Mounting and Cables Battery Disconnect.
- Ignition ON.
- 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 D9.
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. 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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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D9 CHECK THE HEATER CIRCUIT FOR VOLTAGE
- Ignition OFF.
- Connect: Passenger Heated Seat Relay C3254.
- Disconnect: Passenger Cushion Heater Mat C3254.
- Start the engine (except Hybrid turn the ignition ON).
- 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 D10.
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D10 CHECK THE PASSENGER HEATED SEAT RELAY
- Ignition OFF.
- Install a test relay in the passenger heated seat relay C3254.
- Start the engine (except Hybrid turn the ignition ON).
- 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. 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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
DISCONNECT the test relay and GO to D11.
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D11 CHECK THE HEATER CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Passenger Heated Seat Relay C3254.
- 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
GO to D12.
No
REPAIR the circuit. 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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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D12 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 D13.
No
REPAIR the circuit. 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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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D13 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. 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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
INSTALL a new backrest heater mat. 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 Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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D14 CHECK FOR CORRECT HVAC MODULE OPERATION
- Ignition OFF.
- Disconnect and inspect all HVAC Module connectors for:
- corrosion.
- pushed out terminals.
- damaged terminals.
- Connect and correctly seat all the HVAC module connectors.
- 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 (if previously disconnected). Refer to Battery, Mounting and Cables Battery Disconnect.
- Start the engine (except Hybrid, turn the ignition ON).
- Enter the following diagnostic mode on the scan tool: Self Test - HVAC Module.
- Is the concern still present or any DTCs present?
Yes
INSTALL a new HVAC module. REFER to Climate Control Service and Repair. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
DISCONNECT the battery ground cable. CONNECT driver seat safety belt buckle pretensioner C3201 and driver seat side air bag C367. (if previously disconnected).
REPOWER the SRS (if previously depowered). REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
No
The system is working correctly at this time. the concern may have been caused by module connections.
CLEAR the DTCs.
DISCONNECT the battery ground cable. CONNECT driver seat safety belt buckle pretensioner C3201 and driver seat side air bag C367. (if previously disconnected).
REPOWER the SRS (if previously depowered). REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
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