Component Tests and General Diagnostics

Inspection of Power Seat Control System and Its Circuits (If Equipped)

Power seat control module and its circuits can be checked by measuring voltage and resistance at each connector.

NOTE:

If you connect a voltmeter or an ohmmeter directly to the power seat control module by disconnecting the its connectors, you can damage the power seat control module.

Never connect a voltmeter or an ohmmeter directly to any terminal on the power seat control module by disconnecting the its connectors.

Voltage and Signal Check

1) Remove driver seat. Components
2) Remove power seat control module from driver seat with connectors connected.
3) Check terminal voltages and output waveforms using voltmeter and oscilloscope.

NOTE:

- Confirm that battery voltage is 11 V or more.
- An "ignition mode" in the following table represents a power supply mode available with the keyless push start system. For more details, refer to Description of Keyless Engine Start Function Description of Keyless Engine Start Function.
- Outputs from terminals marked with asterisk (*) cannot be measured with voltmeter because they are pulse signals. Use oscilloscope for measuring these outputs.









[A] L17 connector (power seat control module)





[B] L18 connector (power seat control module)

Inspection of BCM and Its Circuits





[C] Power seat main switch connector






Reference Waveform

Oscilloscope display

Shown below is typical waveform display provided by oscilloscope.

NOTE:

- Display includes the following types of data:











- Waveforms may vary with measurement conditions and vehicle specifications.

Magnetic sensor signal (reclining motor)






Magnetic sensor signal (lifter motor)






Magnetic sensor signal (tilt motor)






Magnetic sensor signal (slide motor)





Measurement condition

- When motor is operated.