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Pinpoint Test G: The Power Lumbar Is Inoperative- Passenger

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 CHECK THE LUMBAR MOTOR OPERATION 
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.
    NOTE: If a seat equipped with a supplemental restraint system (SRS) component is being serviced, the SRS must be depowered.
    NOTE: The air bag warning lamp illuminates when the restraints control module (RCM) fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault.
    NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
      WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
    • For vehicles equipped with seat side air bags, carry out the following:
    • Actuate the lumbar control switch to the INFLATE position.
    • Does the lumbar compressor run? 

    Yes  : GO to G2.

    No  : GO to  G3.

  2. G2 CHECK THE AIRFLOW FROM THE LUMBAR MOTOR 
    • Disconnect the lumbar adjusting hose from the lumbar motor.
    • Actuate the lumbar control switch to the INFLATE position while feeling for air at the motor connection.
    • Is air felt at the lumbar motor hose connection? 

    Yes  : INSTALL a new lumbar adjusting pad. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : INSTALL a new lumbar motor. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  3. G3 CHECK CIRCUIT 517 (BK/WH) FOR AN OPEN 
    • Disconnect: Lumbar Control Switch C331.
    • Measure the voltage between lumbar control switch C331-2, circuit 517 (BK/WH), harness side and ground.
      Fig 1: Measuring Voltage Between Lumbar Control Switch C331-2, Circuit 517 And Ground
      G04585876Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to G4.

    No  : VERIFY the battery junction box (BJB) circuit breaker 601 (20A) is OK. If OK, REPAIR circuit 517 (BK/WH). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  4. G4 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Disconnect: Lumbar Motor C336.
    • Measure the resistance between lumbar motor C336-3, circuit 57 (BK), harness side and ground.
      Fig 2: Measuring Resistance Between Lumbar Motor C336-3, Circuit 57 And Ground
      G04585877Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to G5.

    No  : REPAIR circuit 57 (BK). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  5. G5 CHECK FOR VOLTAGE TO THE LUMBAR MOTOR 
    • Connect: Lumbar Control Switch.
    • Measure the voltage between lumbar motor C336-1, circuit 1094 (PK), harness side and C336-3, circuit 57 (BK), harness side while pressing the lumbar control switch INFLATE button.
      Fig 3: Measuring Voltage Between Lumbar Motor C336-1, Circuit 1094 And C336-3, Circuit 57
      G04585878Courtesy of FORD MOTOR CO.
    • Measure the voltage between lumbar motor C336-2, circuit 1097 (BN), harness side and C336-3, circuit 57 (BK), harness side while pressing the lumbar control switch DEFLATE button.
      Fig 4: Measuring Voltage Between Lumbar Motor C336-2, Circuit 1097 And C336-3, Circuit 57
      G04585879Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts 

    Yes  : INSTALL a new lumbar motor. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : GO to G6.

  6. G6 CHECK CIRCUIT 1094 (PK) AND CIRCUIT 1097 (BN) FOR AN OPEN 
    • Disconnect: Lumbar Control Switch C331.
    • Measure the resistance between lumbar control switch C331-1, circuit 1094 (PK), harness side and lumbar motor C336-1, circuit 1094 (PK), harness side; and between lumbar control switch C331-3, circuit 1094 (PK), harness side and lumbar motor C336-1, circuit 1094 (PK), harness side.
      Fig 5: Check Circuit 1094 (PK) And Circuit 1097 (BN) For An Open (1 Of 2)
      G04585880Courtesy of FORD MOTOR CO.
    • Measure the resistance between lumbar control switch C331-7, circuit 1097 (BN), harness side and lumbar motor C336-2, circuit 1097 (BN), harness side.
      Fig 6: Check Circuit 1094 (PK) And Circuit 1097 (BN) For An Open (2 Of 2)
      G04585881Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 

    Yes  : GO to G7.

    No  : REPAIR the affected circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  7. G7 CHECK CIRCUIT 1094 (PK) AND CIRCUIT 1097 (BN) FOR A SHORT TO GROUND 
    • Measure the resistance between lumbar motor C336-1, circuit 1094 (PK), harness side and ground; and between lumbar motor C336-2, circuit 1097 (BN), harness side and ground.
      Fig 7: Checking Circuit 1094 (PK) And Circuit 1097 (BN) For A Short To Ground
      G04585882Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 

    Yes  : GO to G8.

    No  : REPAIR the affected circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

  8. G8 CHECK CIRCUIT 1094 (PK) AND CIRCUIT 1097 (BN) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between lumbar motor C336-1, circuit 1094 (PK), harness side and ground; and between lumbar motor C336-2, circuit 1097 (BN), harness side and ground.
      Fig 8: Checking Circuit 1094 (PK) And Circuit 1097 (BN) For A Short To Voltage
      G04585883Courtesy of FORD MOTOR CO.
    • Is voltage present on either circuit? 

    Yes  : REPAIR the affected circuit. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

    No  : INSTALL a new lumbar control switch. TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the supplemental restraint system (SRS). REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

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