Pinpoint Test F: The Heated Seats Are Inoperative

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

F1 CHECK THE HEATED SEAT INDICATORS
- Start the engine.
- Operate both heated seats on and off.
- Do all the heated seat indicators operate correctly?
- Yes : GO to F4.
- No : GO to F2.
F2 CHECK SCAN TOOL COMMUNICATION WITH THE FCIM AND MONITOR THE PIDs
- Enter the following diagnostic mode on the scan tool: DataLogger - FCIM - PIDs.
  - Driver Heated Seat (CC_SW_D_HSEATS)
  - Passenger Heated Seat (CC_SW_P_HSEATS)
- Monitor the FCIM PIDs while pressing the heated seat switches.
- Do the PID values agree with the switch positions?
- Yes : GO to F3.
- No : If the FCIM does not communicate with the scan tool, REFER to MODULE COMMUNICATIONS NETWORK to diagnose the module communication error. Otherwise, INSTALL a new FCIM. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS . TEST the system for normal operation.
F3 RETRIEVE FCIM DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - FCIM.
- Are any FCIM DTCs retrieved?
- Yes : For all FCIM DTCs, REFER to the MULTIFUNCTION ELECTRONIC MODULES .
- No : GO to F4.
F4 CHECK SCAN TOOL COMMUNICATION WITH THE HVAC MODULE AND RETRIEVE DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - HVAC module.
- Are any HVAC module DTCs retrieved?
- Yes : REFER to HVAC Module DTC Chart .
- No : If the HVAC module does not communicate with the scan tool, REFER to MODULE COMMUNICATIONS NETWORK to diagnose the module communication error. Otherwise, GO to F5.
F5 CHECK FOR VOLTAGE TO THE HEATED SEAT RELAY BOX
- Disconnect: Driver Heated Seat Relay.
- Ignition ON.
- Measure the voltage between:
  - heated seat relay box pin 3, circuit SBB16 (VT/RD) and ground.
  - heated seat relay box pin 1, circuit CBP43 (GY) and ground.
    
    Fig 1: Checking For Voltage To Heated Seat Relay Box
    Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
- Yes : INSTALL a new HVAC module. REFER to CLIMATE CONTROL . REPEAT the self-test. CLEAR the DTCs. TEST the system for normal operation.
- No : VERIFY Battery Junction Box (BJB) fuse 16 (20A) and SJB fuse 43 (10A) are OK. If OK, REPAIR the circuit(s). If not OK, REFER to the OEM WIRING DIAGRAMS to identify the possible causes of the circuit short. TEST the system for normal operation.