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Home >> Ford >> 2009 >> Mustang V6-4.0L >> Repair and Diagnosis >> Body and Frame >> Seats >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Test H: The Power Lumbar Is Inoperative

Pinpoint Test H: The Power Lumbar Is Inoperative




Seats

Pinpoint Tests

Pinpoint Test H: The Power Lumbar is Inoperative

Refer to Wiring Diagram Set 120, Seating for schematic and connector information. Diagrams By Number

Normal Operation

The lumbar control switch is supplied battery voltage on circuit 566 (DG) and ground on circuit 1205 (BK). When the lumbar control switch is operated, voltage and ground are supplied to the power lumbar motor circuits 1094 (PK) and 1097 (BN) to move the lumbar assembly inward or outward. Operating the lumbar control switch in the opposite direction reverses the polarity to the power lumbar motor, which moves the lumbar assembly in the opposite direction.

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



PINPOINT TEST H: THE POWER LUMBAR IS INOPERATIVE

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 air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition switch is ON.

NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

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H1 CHECK CIRCUIT 566 (DG) FOR VOLTAGE


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures of Air Bag Systems.
- Disconnect: Driver Seat Side Air Bag C367.
- Connect: Restraint System Diagnostic Service Tool 418-133 to Driver Seat Side Air Bag C367.
- Disconnect: Lumbar Control Switch C361.
- 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.
- Measure voltage between lumbar control switch C361-4, circuit 566 (DG), harness side and ground.




- Is voltage greater than 10 volts?

Yes
GO to H2.

No
VERIFY Bussed Electrical Center (BEC) fuse 14 (30A) 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.

DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Service Tool from driver seat side air bag module C367. CONNECT driver seat side air bag module C367. REPOWER the SRS. REFER to Air Bag Systems.

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H2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN


- Measure resistance between:
- lumbar control switch C361-2, circuit 1205 (BK), harness side and ground.
- lumbar control switch C361-8, circuit 1205 (BK), harness side and ground.




- Are resistances less than 5 ohms?

Yes
GO to H3.

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

DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Service Tool from driver seat side air bag module C367. CONNECT driver seat side air bag module C367. REPOWER the SRS. REFER to Air Bag Systems.

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H3 CHECK THE LUMBAR MOTOR


- Connect: Lumbar Control Switch C361.
- Disconnect: Power Lumbar Motor C366.
- Measure voltage between power lumbar motor C366-1, circuit 1097 (BN), harness side and power lumbar motor C366-2, circuit 1094 (PK), harness side.




- Operate the power lumbar control switch in both directions.
- Is voltage greater than 10 volts in both directions?

Yes
INSTALL a new power lumbar assembly. REFER to Lumbar Assembly Lumbar Assembly. TEST the system for normal operation.

DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Service Tool from driver seat side air bag module C367. CONNECT driver seat side air bag module C367. REPOWER the SRS. REFER to Air Bag Systems.

No
GO to H4.

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H4 CHECK CIRCUITS 1094 (PK) AND 1097 (BN) FOR A SHORT TO GROUND


- Disconnect: Lumbar Control Switch C361.
- Measure resistance between:
- lumbar control switch C361-3, circuit 1097 (BN), harness side and ground.
- lumbar control switch C361-7, circuit 1094 (PK), harness side and ground.




- Are resistances greater than 10,000 ohms?

Yes
GO to H5.

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

DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Service Tool from driver seat side air bag module C367. CONNECT driver seat side air bag module C367. REPOWER the SRS. REFER to Air Bag Systems.

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H5 CHECK CIRCUITS 1094 (PK) AND 1097 (BN) FOR AN OPEN


- Measure resistance between power lumbar switch C361, harness side and power lumbar motor C366, harness side, using the following chart:









- Are resistances less than 5 ohms?

Yes
INSTALL a new 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 driver seat side air bag module C367. CONNECT driver seat side air bag module C367. REPOWER the SRS. REFER to Air Bag Systems.

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

DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Service Tool from driver seat side air bag module C367. CONNECT driver seat side air bag module C367. REPOWER the SRS. REFER to Air Bag Systems.

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