Pinpoint Test D: DTC B135C:11 Or B135C:15

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

D1 CHECK THE HSWM DTCs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self-Test - HSWM .
Is DTC B135C:11 present?
- Yes : GO to D2 .
- No : For DTC B135C:15, GO to D5.
  For all other DTCs, REFER to the HEATED STEERING WHEEL MODULE (HSWM) DTC CHART .
D2 CHECK THE HEATER ELEMENT VOLTAGE CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: HSWM C2406.
- Measure the resistance between ground and HSWM C2406-8 , circuit CHS72 (YE/BU), harness side.
  
  Fig 1: Measuring Resistance Between Ground And HSWM C2406-8, Circuit CHS72 (YE/BU)
  Courtesy of FORD MOTOR CO.
Is the resistance greater than 10, 000 ohms?
- Yes : GO to D6.
- No : GO to D3 .
D3 CHECK THE HEATER ELEMENT VOLTAGE CIRCUIT FOR A SHORT TO GROUND
- Remove the steering column shrouds to access the clockspring connectors. Refer to STEERING COLUMN SHROUD .
- Disconnect: Clockspring C218D.
- Measure the resistance between ground and HSWM C2406-8 , circuit CHS72 (YE/BU), harness side.
  
  Fig 2: Measuring Resistance Between Ground And HSWM C2406-8, Circuit CHS72 (YE/BU)
  Courtesy of FORD MOTOR CO.
Is the resistance greater than 10, 000 ohms?
- Yes : GO to D4 .
- No : REPAIR circuit CHS72 (YE/BU) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
D4 CHECK THE HEATER ELEMENT FOR A SHORT TO GROUND
- Remove the driver air bag module. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
- Disconnect: Clockspring C218E.
- Measure the resistance between ground and clockspring C218E-1 , harness side.
  
  Fig 3: Measuring Resistance Between Ground And Clockspring C218E-1
  Courtesy of FORD MOTOR CO.
Is the resistance greater than 10, 000 ohms?
- Yes : INSTALL a new clockspring. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . REINSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
- No : INSTALL a new steering wheel. REFER to STEERING WHEEL . REINSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
D5 CHECK THE HEATER ELEMENT VOLTAGE AND GROUND CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Remove the steering column shrouds to access the clockspring connectors. Refer to STEERING COLUMN SHROUD .
- Disconnect: Clockspring C218D.
- Disconnect: HSWM C2406.
- Ignition ON.
- Measure the voltage between ground and:
  - HSWM C2406-8 , circuit CHS72 (YE/BU), harness side.
  - HSWM C2406-7 , circuit RHS72 (YE/GY), harness side.
    
    Fig 4: Checking Heater Element Voltage And Ground Circuit For Short To Voltage
    Courtesy of FORD MOTOR CO.
Is any voltage present?
- Yes : REPAIR circuit CHS72 (YE/BU) or RHS72 (YE/GY) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
- No : GO to D6 .
D6 CHECK THE HEATER ELEMENT AND CIRCUIT RESISTANCE
- Connect: Clockspring C218D (If previously disconnected).
- Measure the resistance between HSWM C2406-7 , circuit RHS72 (YE/GY), harness side and HSWM C2406-8 , circuit CHS72 (YE/BU), harness side.
  
  Fig 5: Measuring Resistance Between HSWM C2406-7, Circuit RHS72 (YE/GY)
  Courtesy of FORD MOTOR CO.
Is the resistance between 1.6 and 3.1 ohms?
- Yes : GO to D10.
- No : If the resistance is less than 1.6 ohms, GO to D7 .
  If the resistance is more than 3.1 ohms, GO to D8.
D7 CHECK THE HEATER ELEMENT CIRCUITS FOR A SHORT
- Disconnect: Clockspring C218D.
- Measure the resistance between HSWM C2406-7 , circuit RHS72 (YE/GY), harness side and HSWM C2406-8 , circuit CHS72 (YE/BU), harness side.
  
  Fig 6: Measuring Resistance Between HSWM C2406-7, Circuit RHS72 (YE/GY)
  Courtesy of FORD MOTOR CO.
Is the resistance greater than 10, 000 ohms?
- Yes : GO to D9.
- No : REPAIR circuit CHS72 (YE/BU) and RHS72 (YE/GY) for a short together. CLEAR the DTCs.
  REPEAT the self-test. TEST the system for normal operation.
D8 CHECK THE HEATER ELEMENT CIRCUITS FOR AN OPEN
- Disconnect: Clockspring C218D.
- Measure the resistance between HSWM C2406-7 , circuit RHS72 (YE/GY), harness side and C218D-2 , circuit RHS72 (YE/GY), harness side.
  
  Fig 7: Measuring Resistance Between HSWM C2406-7 And C218D-2, Circuit RHS72 (YE/GY)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between HSWM C2406-8 , circuit CHS72 (YE/BU), harness side and clockspring C218D-1 , circuit CHS72 (YE/BU), harness side.
  
  Fig 8: Measuring Resistance Between HSWM C2406-8, Circuit CHS72 (YE/BU) And Clockspring C218D-1, Circuit CHS72 (YE/BU)
  Courtesy of FORD MOTOR CO.
Are the resistances less than 5 ohms?
- Yes : GO to D9 .
- No : REPAIR circuit CHS72 (YE/BU) or RHS72 (YE/GY) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
D9 CHECK THE HEATER ELEMENT RESISTANCE
- Remove the driver air bag module. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
- Disconnect: Clockspring C218E.
- Measure the resistance between clockspring C218E-1 , steering wheel side and clockspring C218E-2 , steering wheel side.
  
  Fig 9: Measuring Resistance Between Clockspring C218E-1 And Clockspring C218E-2, Steering Wheel Side
  Courtesy of FORD MOTOR CO.
Is the resistance between 1.6 and 3.1 ohms?
- Yes : INSTALL a new clockspring. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . REINSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
- No : INSTALL a new steering wheel. REFER to STEERING WHEEL . REINSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
D10 CHECK THE HSWM CONNECTION
- Disconnect all the HSWM connectors.
- Inspect the HSWM connectors for:
  - corrosion
  - pushed-out terminals
  - damaged terminals
- Connect and correctly seat all the HSWM connectors.
- Ignition ON.
- Clear the DTCs.
- Enter the following diagnostic mode on the scan tool: Self-Test - Heated Steering Wheel Module (HSWM).
- Operate the heated steering wheel system and verify the concern is still present.
Is the concern still present?
- Yes : INSTALL a new HSWM . REFER to HEATED STEERING WHEEL MODULE (HSWM) . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.