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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1183 (Anti-Theft - Passive Anti-Theft System (Pats) - (Hybrid)) >> Diagnostic Tests >> Anti-Theft >> Pinpoint Tests >> Pinpoint Test G: DTC B1681 - PATS Transceiver Module Signal Is Not Received >> Pinpoint Test G: DTC B1681 - Pats Transceiver Module Signal Is Not Received

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

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. G1 CHECK THE PATS TRANSCEIVER POWER CIRCUIT CBP36 (BU/BN) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: PATS Transceiver C252
    • Key in ON position.
    • Measure the voltage between the PATS transceiver C252-1, circuit CBP36 (BU/BN), harness side and ground.
      • Fig 1: Checking Circuit For Voltage
      GF0014679Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  G2.
    2. NO  : VERIFY the SJB fuse 36 (5A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.
  2. G2 CHECK THE PATS TRANSCEIVER GROUND CIRCUIT GD112 (BK/GN) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the PATS transceiver C252-2, circuit GD112 (BK/GN), harness side and ground.
      • Fig 2: Checking Circuit For Open
      GF0014680Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.
  3. G3 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT VRT23 (VT/GY) FOR VOLTAGE 
    • Connect: PATS Transceiver C252
    • Key in ON position.
    • Measure the voltage by backprobing between the PATS transceiver C252-4, circuit VRT23 (VT/GY), harness side and ground.
      • Fig 3: Checking Circuit For Voltage
      GF0014681Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 8 volts? 
    1. YES  : Go to  G6.
    2. NO  : Go to  G4.
  4. G4 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT VRT23 (VT/GY) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: IC C220
    • Disconnect: PATS Transceiver C252
    • Measure the resistance between the PATS transceiver C252-4, circuit VRT23 (VT/GY), harness side and ground.
      • Fig 4: Checking Circuit For Short To Ground
      GF0014682Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  G5.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.

      If DTC B1681 is retrieved again, go to  G12.

  5. G5 CHECK THE PATS TRANSCEIVER RECEIVE CIRCUIT VRT23 (VT/GY) FOR AN OPEN 
    • Measure the resistance between the IC C220-3, circuit VRT23 (VT/GY), harness side and the PATS transceiver C252-4, circuit VRT23 (VT/GY), harness side.
      • Fig 5: Measuring Resistance
      GF0030585Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G12.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.
  6. G6 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT VRT24 (YE/OG) FOR VOLTAGE 
    NOTE: Replacement of the PATS transceiver does not require the PATS keys to be programmed into the IC again.
    • Measure the voltage by backprobing between the PATS transceiver C252-3, circuit VRT24 (YE/OG), harness side and ground.
      • Fig 6: Checking Circuit For Voltage
      GF0014685Courtesy of FORD MOTOR CO.
    • 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. TEST the system for normal operation.

      If DTC B1681 is retrieved again, go to  G12.

    2. NO  : Go to  G7.
  7. G7 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT VRT24 (YE/OG) FOR A SHORT TO GROUND WITH THE PATS TRANSCEIVER CONNECTED 
    • Key in OFF position.
    • Disconnect: IC C220
    • Measure the resistance between the IC C220-4, circuit VRT24 (YE/OG), harness side and ground.
      • Fig 7: Measuring Resistance Between IC C220-4, Circuit VRT24 (YE/OG), Harness Side & Ground
      GF0032362Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  G9.
    2. NO  : Go to  G8.
  8. G8 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT VRT24 (YE/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 IC again.
    • Disconnect: PATS Transceiver C252
    • Measure the resistance between the IC C220-4, circuit VRT24 (YE/OG), harness side and ground.
      • Fig 8: Measuring Resistance Between IC C220-4, Circuit VRT23 (VT/GY), Harness Side & Ground
      GF0032362Courtesy of FORD MOTOR CO.
    • 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. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.
  9. G9 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT VRT24 (YE/OG) FOR AN OPEN 
    • Disconnect: PATS Transceiver C252
    • Measure the resistance between the IC C220-4, circuit VRT24 (YE/OG), harness side and the PATS transceiver C252-3, circuit VRT24 (YE/OG), harness side.
      • Fig 9: Measuring Resistance
      GF0030583Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G10.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.
  10. G10 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT VRT24 (YE/OG) FOR VOLTAGE 
    NOTE: Replacement of the PATS transceiver does not require the PATS keys to be programmed into the IC again.
    • Connect: PATS Transceiver C252
    • Connect: IC C220
    • Connect the diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: IC DataLogger
    • Trigger the IC active command TRANSMIT SIGNAL to on.
    • Measure the voltage by backprobing between the PATS transceiver C252-3, circuit VRT24 (YE/OG), harness side and ground.
      • Fig 10: Checking Circuit For Voltage
      GF0014685Courtesy of FORD MOTOR CO.
    • 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. TEST the system for normal operation.
    2. NO  : Go to  G11.
  11. G11 CHECK THE PATS TRANSCEIVER TRANSMIT CIRCUIT VRT24 (YE/OG) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: IC C220
    • Disconnect: PATS Transceiver C252
    • Key in ON position.
    • Measure the voltage between the PATS transceiver C252-3, circuit VRT24 (YE/OG), harness side and ground.
      • Fig 11: Checking Circuit For Voltage
      GF0014688Courtesy of FORD MOTOR CO.
    • Is any voltage indicated? 
    1. YES  : REPAIR the circuit. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.
    2. NO  : Go to  G12.
  12. G12 CHECK FOR CORRECT IC OPERATION 
    NOTE: When a new IC is installed, the PATS keys must be programmed into the IC.
    NOTE: When a new IC is installed, the parameters must be reset in the IC and the transmission control module (TCM).
    NOTE: When using the IDS, the IC and the TCM parameters are reset at the same time.
    • Disconnect all the IC connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the IC 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 IC. REFER to INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES article. CARRY OUT the parameter reset procedure on both modules. REFER to Passive Anti-Theft System (PATS) Parameter Reset . PROGRAM the PATS keys into the IC. REFER to Integrated Keyhead Transmitter (IKT) Key Programming Using Diagnostic Equipment . CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.
    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. TEST the system for normal operation.
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