Diagnostic Routine AQ
Diagnostic Routine AQ
Diagnostic Overview
The Power Seat is Inoperative or Does Not Operate Correctly - Driver
Refer to Wiring Diagram Set 120 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
When the seat control switch is activated, voltage and ground is supplied to the applicable seat motor to move the seat to the desired position. There are 2 seat track motors that combine to move the seat cushion horizontally (forward/rearward) and vertically (up/down). There is an additional motor in the seat recliner mechanism to move the seat backrest forward and rearward.
Visual Inspection and Diagnostic Pre-Checks
Verify RJB (Rear Junction Box) fuse 9 (25A) is OK.
Pinpoint Test
NOTE: The SRS (Supplemental Restraint System) must be fully operational and free of faults before releasing the vehicle to the customer.
1. CHECK THE SEAT OPERATION
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: Inline C300B:
- Disconnect the connector block on the seat track.
- Remove the (yellow) driver seat side air bag inline (C300B) from the rear of the connector block (seat side).
- Connect the connector block on the seat track. Tighten to 1 Nm (9 lb-in).
3. Attempt to operate the seat in all directions.
Is the seat inoperative in all directions?
2. CHECK FOR VOLTAGE TO THE POWER SEAT SWITCH
1. Disconnect: Power Seat Switch C352A.
2. Measure:
Is the voltage greater than 11 volts?
3. CHECK THE POWER SEAT SWITCH GROUND CIRCUIT
1. Measure:
Is the resistance less than 3 ohms?
4. CHECK FOR VOLTAGE TO THE DRIVER SEAT RECLINER MOTOR
1. Disconnect: Driver Seat Recliner Motor C368.
2. NOTE: The voltage being measured changes polarity dependent upon which direction the seat control switch is activated.
Measure while pushing the recline switch forward and rearward:
Is the voltage greater than 11 volts when the seat control switch is operated in both directions and 0 volt in the rest position?
5. CHECK THE DRIVER SEAT RECLINER MOTOR CIRCUIT FOR AN OPEN
1. Disconnect: Power Seat Switch C352C.
2. Measure:
Is the resistance less than 3 ohms for both measurements?
6. CHECK FOR VOLTAGE TO THE DRIVER SEAT HORIZONTAL MOTOR
1. Disconnect: Driver Seat Horizontal Motor.
2. NOTE: The voltage being measured changes polarity dependent upon which direction the seat control switch is activated.
Measure pushing the power seat switch forward and rearward:
Is the voltage greater than 11 volts when the seat control switch is operated in both directions and 0 volt in the rest position?
7. CHECK THE HORIZONTAL MOTOR CIRCUITS FOR AN OPEN CIRCUIT
1. Disconnect: Power Seat Switch C352D.
2. Measure:
Is the resistance less than 3 ohms for both measurements?
8. CHECK VOLTAGE TO THE DRIVER SEAT HEIGHT MOTOR
1. Disconnect: Driver Seat Height Motor.
2. NOTE: The voltage being measured changes polarity dependent upon which direction the seat control switch is activated.
Measure while pressing the rear height adjust switch up and down:
Is the voltage greater than 11 volts when the seat control switch is operated in both directions and 0 volt in the rest position?
9. CHECK THE DRIVER SEAT HEIGHT MOTOR CIRCUIT FOR AN OPEN
1. Disconnect: Power Seat Switch C352B.
2. Measure:
Is the resistance less than 3 ohms for both measurements?
10. CHECK FOR SRS (Supplemental Restraint System) DTCs (Diagnostic Trouble Codes)
1. Connect: Power Seat Switch C352A, C352B, C352C or C352D, if previously disconnected.
2. Connect: Driver Seat Recliner Motor, if previously disconnected.
3. Connect: Driver Seat Horizontal Motor, if previously disconnected.
4. Connect: Disconnect: Driver Seat Height Motor, if previously disconnected.
5. 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.
6. Connect: Inline C300B:
- Disconnect the connector block on the seat track.
- Install the (yellow) driver seat side air bag inline (C300B) into the rear of the connector block (seat side).
- Connect the connector block on the seat track. Tighten to 1 Nm (9 lb-in).
7. Ignition ON.
8. Using a scan tool, clear the RCM (Restraints Control Module) DTCs (Diagnostic Trouble Codes).
9. Cycle the ignition OFF then ON.
10. 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?
