Lexus NX manuals

Lexus NX: Park / Neutral Position Switch Circuit

Lexus NX Service Manual / Vehicle Interior / Seat / Rear Power Seat Control System / Park / Neutral Position Switch Circuit

DESCRIPTION

The fold seat control ECU receives switch operation signals, back door open/close signal*1, rear door open/close signal*2 and driving condition signal (shift position, stop light switch assembly, parking brake switch assembly signals) from the main body ECU (multiplex network body ECU). Then, the fold seat control ECU actives the rear seat according these signals.

  • *1: Using No. 2 fold seat switch assembly
  • *2: Using rear power seat switch

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the main body ECU (multiplex network body ECU) is replaced, refer to the Smart Access System with Push-button Start (for Entry Function).

Click here

PROCEDURE

1.

CHECK FOLD SEAT CONTROL ECU (PARK/NEUTRAL POSITION SWITCH SIGNAL)

*A

Rear Right Seat

*B

Rear Left Seat

*a

Component with harness connected

(Fold Seat Control ECU)

(a) Remove the fold seat control ECU with its connectors still connected.

Click here

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

Standard Voltage:

Rear Right Seat

Tester Connection

Condition

Specified Condition

h3-17 (P) - Body ground
  • Power switch on (IG), shift lever is P → other than P
  • Power switch on (IG), stop light switch assembly on → off
  • Power switch on (IG), parking brake switch assembly on → off

11 to 14 V → Below 1 V

Power switch off

11 to 14 V
Rear Left Seat

Tester Connection

Condition

Specified Condition

i3-17 (P) - Body ground
  • Power switch on (IG), shift lever is P → other than P
  • Power switch on (IG), stop light switch assembly on → off
  • Power switch on (IG), parking brake switch assembly on → off

11 to 14 V → Below 1 V

Power switch off

11 to 14 V
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])

(a) Disconnect the h3*1 or i3*2 fold seat control ECU connectors.

  • *1: Rear Right Seat
  • *2: Rear Left Seat

(b) Disconnect the I47 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Rear Right Seat

Tester Connection

Condition

Specified Condition

h3-17 (P) - I47-16 (SFTP)

Always

Below 1 Ω

h3-17 (P) or I47-16 (SFTP) - Body ground

Always

10 kΩ or higher

Rear Left Seat

Tester Connection

Condition

Specified Condition

i3-17 (P) - I47-16 (SFTP)

Always

Below 1 Ω

i3-17 (P) or I47-16 (SFTP) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK FOLD SEAT CONTROL ECU

(a) Replace the fold seat control ECU with a new or normally functioning one.

Click here

(b) Check the rear power seat control system.

Click here

OK:

The rear power seat control system is operated normally.

OK

END (FOLD SEAT CONTROL ECU WAS DEFECTIVE)
NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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