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Pinpoint Test E: DTC B1681- Pats Transceiver Module Signal Is Not Received

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. E1 CHECK THE PATS TRANSCEIVER POWER CIRCUIT 296 (WH/VT) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: PATS Transceiver C2007
    • Key in ON position.
      • Fig 1: Checking Circuit For Voltage
      GF0026060Courtesy of FORD MOTOR CO.
    • Measure the voltage between the PATS transceiver C2007-1, circuit 296 (WH/VT), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  E2.
    2. NO  : VERIFY the SJB fuse 5 (2A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
  2. E2 CHECK THE PATS TRANSCEIVER GROUND CIRCUIT 570 (BK/WH) FOR AN OPEN 
    • Key in OFF position.
      • Fig 2: Checking Circuit For Open
      GF0026061Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PATS transceiver C2007-2, circuit 570 (BK/WH), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  E3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
  3. E3 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT 168 (RD/BK) FOR VOLTAGE 
    • Connect: PATS Transceiver C2007
    • Key in ON position.
      • Fig 3: Checking Circuit For Voltage
      GF0026062Courtesy of FORD MOTOR CO.
    • Measure the voltage by backprobing between the PATS transceiver C2007-4, circuit 168 (RD/BK), harness side and ground.
    • Is the voltage greater than 8 volts? 
    1. YES  : Go to  E6.
    2. NO  : Go to  E4.
  4. E4 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT 168 (RD/BK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: PCM C175b
    • Disconnect: PATS Transceiver C2007
      • Fig 4: Checking Circuit For Short To Ground
      GF0026063Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PATS transceiver C2007-4, circuit 168 (RD/BK), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  E5.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. If DTC B1681 is retrieved again, go to  E12 .
  5. E5 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT 168 (RD/BK) FOR AN OPEN 
      Fig 5: Checking Circuit For Open
      GF0026064Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PATS transceiver C2007-4, circuit 168 (RD/BK), harness side and the PCM C175b-42, circuit 168 (RD/BK), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  E12.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
  6. E6 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT 167 (BN/OG) FOR VOLTAGE 
    NOTE: Replacement of the PATS transceiver does not require the PATS keys to be programmed into the PCM again.
      Fig 6: Checking Circuit For Voltage
      GF0026065Courtesy of FORD MOTOR CO.
    • Measure the voltage by backprobing between the PATS transceiver C2007-3, circuit 167 (BN/OG), harness side and ground.
    • Is the voltage greater than 8 volts? 
    1. YES  : INSTALL a new PATS transceiver. REFER to Passive Anti-Theft System (PATS) Transceiver . CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.

      If DTC B1681 is retrieved again, go to  E12 .

    2. NO  : Go to  E7.
  7. E7 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT 167 (BN/OG) FOR A SHORT TO GROUND WITH THE PATS TRANSCEIVER CONNECTED 
    • Key in OFF position.
    • Disconnect: PCM C175b
      • Fig 7: Checking Circuit For Short To Ground
      GF0026066Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175b-31, circuit 167 (BN/OG), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  E9.
    2. NO  : Go to  E8.
  8. E8 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT 167 (BN/OG) FOR A SHORT TO GROUND WITH THE PATS TRANSCEIVER DISCONNECTED 
    NOTE: Replacement of the PATS transceiver does not require the PATS keys to be programmed into the PCM again.
    • Disconnect: PATS Transceiver C2007
      • Fig 8: Checking Circuit For Short To Ground
      GF0026066Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175b-31, circuit 167 (BN/OG), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new PATS transceiver. REFER to Passive Anti-Theft System (PATS) Transceiver . CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
  9. E9 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT 167 (BN/OG) FOR AN OPEN 
    • Disconnect: PATS Transceiver C2007
      • Fig 9: Checking Circuit For Open
      GF0026067Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175b-31, circuit 167 (BN/OG), harness side and the PATS transceiver C2007-3, circuit 167 (BN/OG), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  E10.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
  10. E10 CHECK THE TRANSMIT CIRCUIT 167 (BN/OG) AT THE PATS TRANSCEIVER FOR VOLTAGE 
    NOTE: Replacement of the PATS transceiver does not require the PATS keys to be programmed into the PCM again.
    • Connect: PATS Transceiver C2007
    • Connect: PCM C175b
    • Connect the diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: PCM Active Commands
    • Trigger the active command transmit signal to on.
      • Fig 10: Checking Circuit For Voltage
      GF0026065Courtesy of FORD MOTOR CO.
    • Measure the voltage by backprobing between the PATS transceiver C2007-3, circuit 167 (BN/OG), harness side and ground.
    • Is the voltage less than 5 volts? 
    1. YES  : INSTALL a new PATS transceiver. REFER to Passive Anti-Theft System (PATS) Transceiver . CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
    2. NO  : Go to  E11.
  11. E11 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT 167 (BN/OG) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: PCM C175b
    • Disconnect: PATS Transceiver C2007
    • Key in ON position.
      • Fig 11: Checking Circuit For Voltage
      GF0026068Courtesy of FORD MOTOR CO.
    • Measure the voltage between the PATS transceiver C2007-3, circuit 167 (BN/OG), harness side and ground.
    • Is any voltage indicated? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
    2. NO  : Go to  E12.
  12. E12 CHECK FOR CORRECT PCM OPERATION 
    NOTE: When a new PCM is installed, the PATS keys must be programmed into the PCM.
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L article or ELECTRONIC ENGINE CONTROLS - 3.0L (4V) article. PROGRAM the PATS keys into the PCM. REFER to Key Programming Using Diagnostic Equipment . REPEAT the self-test.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test.
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