22. Front-rear Slide Pulse Abnormal

SEAT: AUTO ACCESS SEAT SYSTEM: 22: Front-rear Slide Pulse Abnormal
22 - Front-rear Slide Pulse Abnormal

DESCRIPTION

When the power seat switch assembly (front-rear slide switch) or No. 2 power seat switch assembly (front-rear slide switch) have been operated, the position control ECU assembly outputs driving voltage to drive the power seat motor assembly (front-rear slide motor). When the power seat motor assembly (front-rear slide motor) is driven, its pulse sensor sends the seat position information via pulse signal to the position control ECU assembly. Based on this signal, the position control ECU assembly stores the seat front-rear slide position.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When there is a malfunction in the auto access seat, use independent operation mode to ingress the auto access seat. In this case, until the auto access seat has completed the ingress operation, do not disconnect the cable from the negative battery terminal.
* When there is a malfunction in the auto access seat, before beginning the troubleshooting procedure, first perform initialization Auto Access Seat System and verify the auto access seat operation. If the seat is still malfunctioning, perform the troubleshooting procedure.
* After inspecting and repairing the auto access seat, be sure to perform initialization Auto Access Seat System.
* After performing initialization, be sure to inspect the operation of the auto access seat Operation Check.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY)

(a) Disconnect the Q10 and Q11 power seat motor assembly (front-rear slide motor) connectors.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





(c) Reconnect the power seat motor assembly (front-rear slide motor) connectors.

NG -- CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT-REAR SLIDE MOTOR)
OK -- Continue to next step.

2. CHECK POWER SEAT MOTOR ASSEMBLY (FRONT-REAR SLIDE MOTOR)

(a) Using an oscilloscope, check the waveform.





OK:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT-REAR SLIDE MOTOR)

OK -- REPLACE POSITION CONTROL ECU ASSEMBLY Disassembly

3. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT-REAR SLIDE MOTOR)

(a) Disconnect the Q3 position control ECU assembly connector.

(b) Disconnect the Q11 power seat motor assembly (front-rear slide motor) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(d) Reconnect the power seat motor assembly (front-rear slide motor) connector.

(e) Reconnect the position control ECU assembly connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. REPLACE POWER SEAT MOTOR ASSEMBLY (FRONT-REAR SLIDE MOTOR)

(a) Temporarily replace the power seat motor assembly (front-rear slide motor) with a new or normally functioning one Disassembly.

NEXT -- Continue to next step.

5. CHECK OPERATION

(a) Confirm that the auto access seat operates correctly Operation Check.

OK:

Auto access seat operates correctly.

NG -- REPLACE POSITION CONTROL ECU ASSEMBLY Disassembly

OK -- END

6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT-REAR SLIDE MOTOR)

(a) Disconnect the Q4 and Q2 position control ECU assembly connectors.

(b) Disconnect the Q10 and Q11 power seat motor assembly (front-rear slide motor) connectors.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(d) Reconnect the power seat motor assembly (front-rear slide motor) connectors.

(e) Reconnect the position control ECU assembly connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POSITION CONTROL ECU ASSEMBLY Disassembly