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Home >> Ford >> 2012 >> Explorer Limited, 3.5 8, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control - DATC >> Diagnostic Routine(S) >> Diagnostic Routine R >> Pinpoint Test

Pinpoint Test

  1. CHECK THE HVAC MODULE FOR DTCs 
    1. Ignition ON.
    2. Using a scan tool, perform a HVAC module self-test.

    Are any DTCs present? 

    • Yes: For DTC B10AF:12, GO to 2  .

      For DTC B10AF:13, GO to  4.

      For DTC B10B9:14, GO to  8.

    • No: GO to  7.
  2. CHECK THE BLOWER MOTOR RELAY FUNCTIONALITY
    1. Install a known good blower motor relay.

    Does the blower motor function correctly? 

    • Yes: INSTALL a new blower motor relay.
    • No: GO to 3  .
  3. CHECK THE BLOWER MOTOR CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
    1. Ignition OFF.
    2. Disconnect: Blower Motor Relay.
    3. Disconnect: HVAC module C228A.
    4. Ignition ON.
    5. Measure:
      BJB Ground
      G08033223
      G08033224
      Blower Motor Relay Socket Ground
      Pin Circuit Measurement / Action Pin Circuit
      1 CH123 (VT/GN)
      G08033225
      		 - Ground

    Is any voltage present? 

    • Yes: REPAIR the circuit.
    • No: GO to  17.
  4. CHECK THE BLOWER MOTOR RELAY FUNCTIONALITY
    1. Install a known good blower motor relay.

    Does the blower motor function correctly? 

    • Yes: INSTALL a new blower motor relay.
    • No: GO to 5  .
  5. CHECK THE BLOWER MOTOR RELAY COIL SUPPLY VOLTAGE
    1. Ignition OFF.
    2. Disconnect: Blower Motor Relay.
    3. Ignition ON.
    4. Measure:
      BJB Ground
      G08033223
      G08033227
      Blower Motor Relay Socket Ground
      Pin Circuit Measurement / Action Pin Circuit
      2 CBB89 (VT/GY)
      G08033228
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: GO to 6  .
    • No: VERIFY BJB fuse 89 (5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the appropriate wiring diagrams to identify the possible causes of the circuit short. REFER to OEM FUSE AND RELAY INFORMATION and OEM WIRING DIAGRAMS .
  6. CHECK THE BLOWER MOTOR RELAY COIL CONTROL CIRCUIT FOR AN OPEN
    1. Ignition OFF.
    2. Disconnect: HVAC Module C228A.
    3. Measure:
      BJB HVAC Module
      G08033223
      G08033230
      Blower Motor Relay Socket C228A
      Pin Circuit Measurement / Action Pin Circuit
      1 CH123 (VT/GN)
      G08033231
      		 11 CH123 (VT/GN)

    Is the resistance less than 3 ohms? 

    • Yes: GO to  17.
    • No: REPAIR the circuit.
  7. CHECK THE BLOWER MOTOR OPERATION USING ACTIVE COMMANDS
    1. Using a scan tool, view HVAC Module PIDs  .
    2. Select PANEL mode on the HVAC controls.
    3. Select the lowest blower motor setting.
    4. Monitor blower motor speed while using the scan tool to operate the active command PID BLOWRSPD, increasing and decreasing the percentage value.

    Does the blower motor speed change between low and high when the active command is changed? 

  8. CHECK THE BLOWER MOTOR RELAY FUNCTIONALITY
    1. Install a known good blower motor relay.

    Does the blower motor function correctly? 

    • Yes: INSTALL a new blower motor relay.
    • No: GO to 9  .
  9. CHECK FOR VOLTAGE AT THE BLOWER MOTOR RELAY SWITCH CONTACT
    1. Disconnect: Blower Motor Relay
    2. Measure:
      BJB Ground
      G08033223
      G08033233
      Blower Motor Relay Socket Ground
      Pin Circuit Measurement / Action Pin Circuit
      3 SBB18 (YE/RD)
      G08033234
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: GO to 10  .
    • No: VERIFY BJB fuse 18 (40A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the appropriate wiring diagrams to identify the possible causes of the circuit short. REFER to OEM FUSE AND RELAY INFORMATION and OEM WIRING DIAGRAMS .
  10. CHECK VOLTAGE TO THE BLOWER MOTOR WITH THE BLOWER MOTOR RELAY BYPASSED
    1. Ignition OFF.
    2. Disconnect: Blower Motor.
    3. Connect a fused jumper:
      BJB BJB
      G08033223
      G08033223
      Blower Motor Relay Socket Blower Motor Relay Socket
      Pin Circuit Measurement / Action Pin Circuit
      3 SBB18 (YE/RD)
      G08033237
      		 5 CH402 (YE/GN)
    4. Ignition ON.
    5. Measure:
      Blower Motor Ground
      G08033238
      G08033239
      C2004 Ground
      Pin Circuit Measurement / Action Pin Circuit
      1 CH402 (YE/GN)
      G08033240
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: DISCONNECT the fused jumper wire and CONNECT the blower motor relay. GO to 11  .
    • No: REPAIR the circuit.
  11. CHECK THE BLOWER MOTOR SPEED CONTROL POWER CIRCUIT FOR VOLTAGE
    1. Ignition OFF.
    2. Disconnect: Blower Motor Speed Control.
    3. Ignition ON.
    4. Measure:
      Blower Motor Speed Control Ground
      G08033241
      G08033242
      C271 Ground
      Pin Circuit Measurement / Action Pin Circuit
      4 CH402 (YE/GN)
      G08033243
      		 - Ground

    Is the voltage greater than 11 volts? 

    • Yes: CONNECT the blower motor speed control. GO to 12  .
    • No: REPAIR the circuit.
  12. CHECK FOR BLOWER MOTOR FUNCTIONALITY WITH A TEST LIGHT IN PLACE OF THE BLOWER MOTOR
    NOTE: This step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning of this section or equivalent. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.
    • Ignition OFF.
    • Disconnect: Blower Motor.
    • Connect:
      Blower Motor Blower Motor
      G08033244
      G08033245
      C2004 C2004
      Pin Circuit Measurement / Action Pin Circuit
      1 CH402 (YE/GN)
      G08033246
      		 2 VH301 (YE/BU)
    • Ignition ON.
    • Select panel mode with the blower motor on high.

    Does the test lamp illuminate? 

    • Yes: INSTALL a new blower motor. REFER to Blower Motor .
    • No: GO to 13  .
  13. CHECK THE BLOWER MOTOR GROUND CIRCUIT FOR AN OPEN
    1. Ignition OFF.
    2. Disconnect: Blower Motor Speed Control.
    3. Measure:
      Blower Motor Blower Motor Speed Control
      G08033247
      G08033248
      C2004 C271
      Pin Circuit Measurement / Action Pin Circuit
      2 VH301 (YE/BU)
      G08033249
      		 2 VH301 (YE/BU)

    Is the resistance less than 3 ohms? 

    • Yes: GO to 14  .
    • No: REPAIR the circuit.
  14. CHECK THE BLOWER MOTOR SPEED CONTROL GROUND CIRCUIT FOR AN OPEN
    1. Measure:
      Blower Motor Speed Control Ground
      G08033250
      G08033251
      C271 Ground
      Pin Circuit Measurement / Action Pin Circuit
      1 GD215 (BK/GY)
      G08033252
      		 - Ground

    Is the resistance less than 3 ohms? 

    • Yes: GO to 15  .
    • No: REPAIR the circuit.
  15. CHECK THE BLOWER MOTOR SPEED CONTROL COMMAND CIRCUIT FOR A SHORT TO GROUND
    1. Disconnect: HVAC Module C228A.
    2. Measure:
      HVAC Module Ground
      G08033254
      G08033253
      C228A Ground
      Pin Circuit Measurement / Action Pin Circuit
      1 VH101 (WH/VT)
      G08033255
      		 - Ground

    Is the resistance greater than 10, 000 ohms? 

    • Yes: GO to 16  .
    • No: REPAIR the circuit.
  16. CHECK THE BLOWER MOTOR SPEED CONTROL COMMAND CIRCUIT FOR AN OPEN
    1. Measure:
      Blower Motor Speed Control HVAC Module
      G08033256
      G08033257
      C271 C228A
      Pin Circuit Measurement / Action Pin Circuit
      3 VH101 (WH/VT)
      G08033258
      		 1 VH101 (WH/VT)

    Is the resistance less than 3 ohms? 

    • Yes: INSTALL a new blower motor speed control. REFER to Blower Motor Speed Control . If the concern is still present, GO to 17  .
    • No: REPAIR the circuit.
  17. CHECK FOR CORRECT HVAC MODULE OPERATION
    1. Ignition OFF.
    2. Disconnect and inspect all HVAC module connectors.
    3. Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    4. Reconnect the HVAC module connectors. Make sure they seat and latch correctly.
    5. Operate the system and determine if the concern is still present.

    Is the concern still present? 

    • Yes: CHECK OASIS  for any applicable TSBs  . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs  address this concern, INSTALL a new HVAC module. REFER to Heating Ventilation Air Conditioning (HVAC) Module .
    • 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.
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