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Home >> Mercury >> 2011 >> Grand Marquis V8-4.6L >> Repair and Diagnosis >> Body and Frame >> Seats >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Test J: The Power Lumbar Is Inoperative - Passenger

Pinpoint Test J: The Power Lumbar Is Inoperative - Passenger




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Pinpoint Tests

Pinpoint Test J: The Power Lumbar is Inoperative - Passenger

Refer to Wiring Diagram Set 122, Power Lumbar Seats for schematic and connector information. Diagrams By Number

Normal Operation

The lumbar control switch is supplied voltage and ground. The lumbar control switch toggles voltage and ground directly to the lumbar motor circuits. The lumbar motor tightens or relaxes a cable connected to the lumbar adjuster.

This pinpoint test is intended to diagnose the following:
- Circuit breaker
- Wiring, terminals or connectors
- Lumbar control switch
- Lumbar assembly

PINPOINT TEST J: THE POWER LUMBAR IS INOPERATIVE - PASSENGER

WARNING: Remove restraint system diagnostic tools from the vehicle prior to road testing. If tools are not removed, the supplemental restraint system (SRS) device may not deploy in a crash. Failure to follow this instruction may result in serious personal injury or death in a crash and possibly violate vehicle safety standards.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTICE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification

NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

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J1 CHECK FOR VOLTAGE TO THE LUMBAR CONTROL SWITCH


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: Passenger Seat Side Air Bag C316.
- Connect: Restraint System Diagnostic Service Tool to Passenger Seat Side Air Bag C316.
- Disconnect: Passenger Lumbar Control Switch C331.

- WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.

- Connect the battery ground cable. Refer to Battery, Mounting and Cables Battery Disconnect.
- Measure voltage between lumbar control switch C331-2, circuit 517 (BK/WH), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to J2.

No
VERIFY the Battery Junction Box (BJB) circuit breaker 601 (20A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation. Diagrams By Number

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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J2 CHECK FOR GROUND TO THE LUMBAR CONTROL SWITCH


- Measure the resistance between:
- passenger lumbar control switch C331-3, circuit 57 (BK), harness side and ground.
- passenger lumbar control switch C331-6, circuit 57 (BK), harness side and ground.




- Are the resistances less than 5 ohms?

Yes
GO to J3.

No
REPAIR the circuit. TEST the system for normal operation.

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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J3 CHECK VOLTAGE TO THE LUMBAR MOTOR


- Connect: Passenger Lumbar Control Switch C331.
- Disconnect: Passenger Lumbar Motor C336.
- Measure the voltage between passenger lumbar motor C336-2, circuit 1097 (BN) and C336-1, circuit 1094 (PK) while operating the passenger lumbar control switch in both directions.




- Is the voltage greater than 10 volts with the switch in both directions?

Yes
INSTALL a new passenger lumbar assembly. REFER to Lumbar Assembly [1][2]Lumbar Assembly. TEST the system for normal operation.

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

No
GO to J4.

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J4 CHECK THE LUMBAR MOTOR CIRCUITS FOR A SHORT TO GROUND


- Disconnect: Passenger Lumbar Control Switch C331.
- Measure the resistance between:
- passenger lumbar control switch C331-1, circuit 1097 (BN), harness side and ground.
- passenger lumbar control switch C331-7, circuit 1094 (PK), harness side and ground.




- Are the resistances greater than 10,000 ohms?

Yes
GO to J5.

No
REPAIR the circuit(s). TEST the system for normal operation.

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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J5 CHECK THE LUMBAR MOTOR CIRCUITS FOR AN OPEN


- Measure the resistance between:
- passenger lumbar control switch C331-1, circuit 1097 (BN), harness side and passenger lumbar motor C336-2, circuit 1097 (BN), harness side.
- passenger lumbar control switch C331-7, circuit 1094 (PK), harness side and passenger lumbar motor C336-1, circuit 1094 (PK), harness side.




- Are the resistances less than 5 ohms?

Yes
INSTALL a new passenger lumbar control switch. REFER to Lumbar Control Switch Lumbar Control Switch. TEST the system for normal operation.

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

No
REPAIR the circuit(s). TEST the system for normal operation.

DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic service tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to Supplemental Restraint System Supplemental Restraint System (SRS) Depowering and Repowering.

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