Infiniti M35/M45 Y50. Manual - part 1073

AUTOMATIC DRIVE POSITIONER

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2. 

CHECK UART LINE INPUT/OUTPUT SIGNAL 1

1.

Connect driver seat control unit and automatic drive positioner control unit connector.

2.

Turn ignition switch ON.

3.

Check signal between driver seat control unit connector and
ground, with oscilloscope.

OK or NG

OK

>> GO TO 3.

NG

>> Check the following.

●

When voltage wave form does not appear with a constant voltage (approx. 5V), replace driver
seat control unit.

●

When voltage wave form does not appear with a constant voltage (approx. 0V), replace auto-
matic drive positioner control unit.

3. 

CHECK UART LINE INPUT/OUTPUT SIGNAL 2

Check signal between automatic drive positioner control unit con-
nector and ground, with oscilloscope.

OK or NG

OK

>> GO TO 4.

NG

>> Check the following.

●

When voltage wave form does not appear with a constant voltage (approx. 5V), replace auto-
matic drive positioner control unit.

●

When voltage wave form does not appear with a constant voltage (approx. 0V), replace driver
seat control unit.

4. 

CHECK DRIVER SEAT CONTROL UNIT

Does the automatic drive positioner operate when the driver seat control unit is exchanged?

Driver seat 

control 

unit 

connector

Terminals 

Condition

Signal

(Reference value)

(+)

(–)

B204

17

Ground

Tilt switch 
operated

PIIB6202E

SKIA0175E

Automatic 

drive posi-

tioner con-

trol unit 

connector

Terminals 

Condition

Signal

(Reference value)

(+)

(–)

M6

10

Ground

Tilt switch 
operated.

PIIB6203E

SKIA0175E

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AUTOMATIC DRIVE POSITIONER

OK or NG

OK

>> Replace driver seat control unit. 

NG

>> Replace automatic drive positioner control unit.

Check Lumbar Support Circuit 

NIS0026Y

1. 

CHECK LUMBAR SUPPORT SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect lumbar support switch connector.

3.

Check voltage between lumbar support switch connector and
ground.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace harness between fuse block (J/B) and

lumbar support switch. 

2. 

CHECK LUMBAR SUPPORT SWITCH

Check continuity lumbar support switch connector.

OK or NG

OK

>> GO TO 3.

NG

>> Replace lumbar support switch.

Terminals

Voltage (V)

(Approx.)

(+)

(–)

Lumbar support 

switch connector

Terminal

B212

55

Ground

Battery voltage

PIIB6204E

Lumbar 

support switch

Terminal

Condition of 

lumbar support switch

Continuity

B212

55

57

FORWARD

Yes

Other than above

No

58

BACKWARD

Yes

Other than above

No

56

57

FORWARD

No

Other than above

Yes

58

BACKWARD

No

Other than above

Yes

PIIB6205E

AUTOMATIC DRIVE POSITIONER

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3. 

CHECK LUMBAR SUPPORT MOTOR HARNESS

1.

Disconnect lumbar support motor connector.

2.

Check continuity between lumbar support switch connector and
lumbar support motor connector.

3.

Check continuity between lumbar support switch connector and
ground.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace harness.

4. 

CHECK LUMBAR SUPPORT SWITCH GROUND CIRCUIT

Check continuity between lumbar support switch connector and
ground.

OK or NG

OK

>> Check the condition of the harness and connector.

NG

>> Repair or replace harness between lumbar support

switch and ground. 

A

B

Continuity 

Lumbar support 

switch connector

Terminal

Lumbar support 

motor connector

Terminal

B212

57

B211

57

Yes

58

58

A

Ground

Continuity 

Lumbar support switch 

connector

Terminal

B212

57

No

58

PIIB6206E

Lumbar support switch

connector

Terminal

Ground

Continuity 

B212

56

Yes

PIIB6207E

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POWER SEAT(PASSENGER SIDE)

POWER SEAT(PASSENGER SIDE)

PFP:87050

Schematic

NIS0028P

TIWT2055E