Diagnostic Routine H

Diagnostic Routine H

Diagnostic Overview

The Power Lumbar is Inoperative - Passenger

Refer to Wiring Diagram Set 120 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

The seat control switch contains the lumbar button, and when pressed, supplies battery voltage and ground to the power lumbar motor to move the lumbar assembly in the desired direction.

Pinpoint Test

1. CHECK THE POWER LUMBAR MOTOR

1. WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.

2. Disconnect: Passenger Seat Side Air Bag C339.

3. Disconnect: Power Lumbar Motor C3216.

4. NOTE: During the following step, the voltage being measured changes polarity dependent upon which direction the seat control switch is activated.
While operating the seat control switch in both directions, measure:





Is the voltage greater than 11 volts when the seat control switch is operated and 0 volt in the rest position?








2. CHECK THE POWER LUMBAR MOTOR CIRCUITS FOR A SHORT TO GROUND

1. Disconnect: Passenger Seat Control Switch C330.

2. Measure:








Are the resistances greater than 10,000 ohms?








3. CHECK THE POWER LUMBAR MOTOR CIRCUITS FOR AN OPEN

1. Measure:








Are the resistances less than 3 ohms?








4. CHECK FOR SRS (Supplemental Restraint System) DTCs (Diagnostic Trouble Codes)

1. WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.

2. Connect: Passenger Seat Side Air Bag C339.

3. Connect: All previously disconnected electrical connectors.

4. Ignition ON.

5. Using a scan tool, clear the RCM (Restraints Control Module) DTCs (Diagnostic Trouble Codes).

6. Cycle the ignition OFF then ON.

7. Using a scan tool, perform RCM (Restraints Control Module) self-test.

Are any RCM (Restraints Control Module) DTCs (Diagnostic Trouble Codes) retrieved during self-test?