Infiniti F50. Manual - part 752

TROUBLE DIAGNOSIS FOR SYMPTOMS

SCS-25

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TROUBLE DIAGNOSIS FOR SYMPTOMS

PFP:00007

Inspection 5: Hard or Soft Feel

EES000EW

1. 

SELF-DIAGNOSTICS INSPECTION

●

Disconnect control unit connector and shock absorber actuator connector, then re-connect them.

●

Perform self-diagnosis to check that proper test results are obtained.

Inspection results OK?

OK

>> GO TO 2.

NG

>> Check and repair detected area.

2. 

CHECK SHOCK ABSORBER ACTUATOR OPERATION

●

Set the diagnostic system in the self-diagnosis mode.

●

Depress parking brake pedal.

●

Set select switch to “AUTO”, then move vehicle body up and down to check that dampening force of each
shock absorber is high. Brake pedal should be released during tests.

●

Set select lever to “SPORT”, then move vehicle body up and down to check that dampening force of each
shock absorber is high.

Inspection results OK?

OK

>> GO TO 11.

NG

>> GO TO 3.

3. 

CHECK SHOCK ABSORBER ACTUATOR

●

Measure resistance between shock absorber actuator terminals.

Inspection results OK?

OK

>> GO TO 4.

NG

>> Replace actuator.

4. 

CHECK CONTROL UNIT OUTPUT SIGNAL

●

Measure voltage between control unit connector terminals 42 (L/
R), 48 (B/R) and body ground.

Inspection results OK?

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

CHECK HARNESS CONNECTOR

●

Check continuity between control unit and shock absorber actuator terminals.

Inspection results OK?

OK

>> Replace control unit

NG

>> Replace harness connector.

Front

1,2,4,5 - 3

: Approx. 12

Ω

Rear

1,3,4,5 - 2

: Approx. 12

Ω

SEIA0284E

42 (L/R),48 (B/R) - Body ground

: Battery voltage

SEIA0285E

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TROUBLE DIAGNOSIS FOR SYMPTOMS

6. 

CHECK SHOCK ABSORBER ACTUATOR OPERATION

●

Remove actuator from strut.

●

Set diagnostic system in the self-diagnostic mode.

●

Check that actuator operates as shown in the figure when select
switch is set to “AUTO” or “SPORT”, and brake pedal is
depressed or released.

Inspection results OK?

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

CHECK HARNESS CONNECTOR

●

Check continuity between control unit and shock absorber actuator terminals.

Inspection results OK?

OK

>> Replace control unit.

NG

>> Repair or replace harness or connector.

8. 

CHECK SHOCK ABSORBER CONTROL ROD

●

Pinch control rod with your fingers, then turn it 2 or 3 rotations to check that it rotates smoothly without
free play.

Inspection results OK?

OK

>> GO TO 9.

NG

>> Replace shock absorber.

9. 

SELF-DIAGNOSTICS1

●

Install actuator and perform self-diagnosis.

●

Turn ignition switch to “ON” to initialize actuator positioning, then re-perform self-diagnosis to check actu-
ator operation.

Inspection results OK?

OK

>> INSPECTION END.

NG

>> GO TO 10.

10. 

SELF-DIAGNOSTICS 2

●

Replace with a new actuator, then perform self-diagnosis.

●

Turn ignition switch to “ON” to initialize actuator positioning, then re-perform self-diagnosis to check actu-
ator operation.

Inspection results OK?

OK

>> Replace actuator

NG

>> Replace shock absorber.

11. 

CHECK RIDE COMFORT

●

Check for improved riding comfort.

Inspection results OK?

OK

>> INSPECTION END.

NG

>> Replace shock absorber.

SEIA0093E

SE-1

SEAT

I  BODY

CONTENTS

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SECTION 

A

B

SE

SEAT

PRECAUTIONS .......................................................... 4

Service Notice  .......................................................... 4
Precautions for Supplemental Restraint System 
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 4
Precautions for work  ................................................ 4
Trouble diagnosis precaution  ................................... 5

PREPARATION ........................................................... 6

Special Service Tools  ............................................... 6
Commercial Service Tools ........................................ 6

SQUEAK AND RATTLE TROUBLE DIAGNOSES ..... 7

Work Flow  ................................................................ 7

CUSTOMER INTERVIEW ..................................... 7
DUPLICATE THE NOISE AND TEST DRIVE  ....... 8
CHECK RELATED SERVICE BULLETINS  ........... 8
LOCATE THE NOISE AND IDENTIFY THE 
ROOT CAUSE  ...................................................... 8
REPAIR THE CAUSE  ........................................... 8
CONFIRM THE REPAIR  ....................................... 9

Generic Squeak and Rattle Troubleshooting  ........... 9

INSTRUMENT PANEL  .......................................... 9
CENTER CONSOLE ............................................. 9
DOORS ................................................................. 9
TRUNK ................................................................ 10
SUNROOF/HEADLINER ..................................... 10
SEATS ................................................................. 10
UNDERHOOD ..................................................... 10

Diagnostic Worksheet  .............................................11

AUTOMATIC DRIVE POSITIONER  .......................... 13

System Description  ................................................ 13

MANUAL OPERATION  ....................................... 13
AUTOMATIC OPERATION  ................................. 13
FAIL–SAFE MODE .............................................. 13
CANCEL OF FAIL-SAFE MODE ......................... 14
MEMORY STORING ........................................... 14
MEMORY SWITCH OPERATION  ....................... 15
TURNOUT OPERATION ..................................... 15
RETURN OPERATION  ....................................... 16
REAR POWER SEAT TURNOUT OPERATION 

... 16

Component Parts and Harness Connector Location 

... 17

Schematic ............................................................... 19
Wiring Diagram–AUT/DP– ...................................... 21
Terminals and Reference Values for BCM .............. 31
Terminals and Reference Values for Driver Seat 
Control Unit ............................................................. 33
Work Flow ............................................................... 35
Preliminary Check  .................................................. 36

SETTING CHANGE FUNCTION  ......................... 36
POWER SUPPLY AND GROUND CIRCUIT 
INSPECTION ...................................................... 36

CONSULT-II Function ............................................. 39

CONSULT-II BASIC OPERATION PROCEDURE 

... 39

IVMS COMMUNICATION INSPECTION. ............ 40
COMMUNICATION SYSTEM A  .......................... 41
COMMUNICATION SYSTEM B  .......................... 42
COMMUNICATION SYSTEM C  .......................... 42
WORK SUPPORT  ............................................... 42
SELF-DIAGNOSIS RESULTS  ............................. 43
DATA MONITOR  ................................................. 44
ACTIVE TEST  ..................................................... 45

On Board Diagnosis  ............................................... 46

DIAGNOSIS ITEM  ............................................... 46
COMMUNICATION DIAGNOSIS ......................... 47
COMMUNICATION SYSTEM A  .......................... 48
COMMUNICATION SYSTEM B  .......................... 49
COMMUNICATION SYSTEM C  .......................... 49
SWITCH MONITOR  ............................................ 50
ON BOARD DIAGNOSIS FOR AUTOMATIC 
DRIVE POSITIONER  .......................................... 51

Symptom Chart ....................................................... 53
Seat Sliding Motor Circuit Inspection ...................... 55
Seat Reclining Motor Circuit Inspection .................. 56
Front Lifting Motor Circuit Inspection ...................... 57
Rear Lifting Motor Circuit Inspection  ...................... 59
Steering Wheel Telescopic Motor Circuit Inspection ... 60
Steering Wheel Tilt Motor Circuit Inspection ........... 62
Seat Sliding Sensor Circuit Inspection  ................... 63
Seat Reclining Sensor Circuit Inspection  ............... 64
Front Lifting sensor Circuit Inspection  .................... 66

SE-2

Rear Lifting Sensor Circuit Inspection  .................... 67
Detention Switch Circuit Inspection  ........................ 68
Telescopic Sensor Circuit Inspection  ...................... 69
Tilt Sensor Circuit Inspection  .................................. 70
Key Switch and Key Lock Solenoid Circuit Inspec-
tion. ......................................................................... 71
Front Door Switch (Driver Side) Circuit Inspection. ... 73
Vehicle Speed Signal Inspection  ............................ 74
Seat Memory Switch Circuit Inspection  .................. 76
Seat Sliding Switch Circuit Inspection  .................... 78
Seat Reclining Switch System Inspection  .............. 80
Front Lifting Switch Circuit Inspection  .................... 82
Rear Lifting Switch Circuit Inspection  ..................... 84
Steering Wheel Telescopic Switch Inspection  ........ 86
Steering Wheel Tilt Switch Inspection ..................... 88
Seat Memory Indicator lamp System Inspection  .... 90
Lumber Support Circuit Inspection  ......................... 91
Rear Power Seat Turnout Operation Inspection  ..... 93

POWER SEAT  ........................................................... 94

System Description ................................................. 94

FRONT POWER SEAT (PASSENGER SIDE) 
OPERATION ........................................................ 94
REAR POWER SEAT LH AND REAR POWER 
SEAT RH OPERATION  ....................................... 95
REAR SEAT TURNOUT/RETURN FUNCTION ... 96

Component Parts and Harness Connector Location ... 97
Schematic ............................................................... 98
Wiring Diagram–SEAT– .......................................... 99
Terminals and Reference Values for Passenger 
Side Power Seat Switch  ....................................... 105
Terminals and Reference Values for Rear Power 
Seat Control Unit LH ............................................. 105
Terminals and Reference Values for Rear Power 
Seat Control Unit RH  ............................................ 106
Work Flow ............................................................. 107
Trouble Diagnoses Symptom Chart ...................... 107
Power Seat Switch Circuit Inspection  ................... 109
Front Power Seat Passenger Side Power Supply 
Circuit Inspection  .................................................. 109
Front Power Seat (Passenger Side) Sliding Circuit 
Inspection ............................................................. 110
Front Power Seat Passenger Side Reclining Circuit 
Inspection ..............................................................111
Front Power Seat Passenger Side Front Lifting Cir-
cuit Inspection ....................................................... 112
Front Power Seat Passenger Side Rear Lifting Cir-
cuit Inspection ....................................................... 113
Rear Power Seat Control unit Power Supply and 
Ground Circuit Inspection (With Heated Seat)  ..... 113
Rear Power Seat Sliding Motor Circuit Inspection 
(With Heated Seat)  ............................................... 114
Rear Power Seat Switch Circuit Inspection (With 
Heated Seat)  ........................................................ 115
Auto Return Cancel Switch Circuit Inspection 1 
(With Heated Seat)  ............................................... 116
Auto Return Cancel Switch Circuit Inspection 2 
(With Heated Seat)  ............................................... 117
Rear Door Switch Circuit Inspection (With Heated 
Seat) ..................................................................... 118

Rear Power Seat Sliding Sensor Circuit Inspection 
(With Heated Seat)  ............................................... 119
Rear Power Seat Control Unit Power Supply and 
Ground Inspection (Without Heated Seat)  ............120
Rear Power Seat Sliding Motor Circuit Inspection 
(Without Heated Seat)  ..........................................121
Rear Power Seat Switch Circuit Inspection (Without 
Heated Seat) .........................................................122
Auto Return Cancel Switch Circuit Inspection 1 
(Without Heated Seat)  ..........................................123
Auto Return Cancel Switch Circuit Inspection 2 
(Without Heated Seat)  ..........................................124
Rear Door Switch Circuit Inspection (Without 
Heated Seat) .........................................................125
Rear Power Seat Sliding Sensor Circuit Inspection 
(Without Heated Seat)  ..........................................126

HEATED SEAT  ........................................................128

System Description  ...............................................128

FRONT HEATED SEAT  .....................................128
REAR HEATED SEAT  .......................................128

Component Parts and Harness Connector Location .130
Wiring Diagram – HSEAT –  ..................................131

FRONT HEATED SEAT  .....................................131

Schematic .............................................................133

REAR HEATED SEAT  .......................................133

Wiring Diagram – HSEAT –  ..................................134

REAR HEATED SEAT  .......................................134

Terminals and Reference Values for Rear Power 
Seat Control Unit LH and RH ................................139
Work Flow  .............................................................139
Trouble Diagnoses Symptom Chart  ......................140
Heated Seat Power Supply Circuit Inspection  ......141
Front Heated Seat Switch Inspection ....................141
Front Heated Seat Circuit Inspection 1  .................142
Front Heated Seat Circuit Inspection 2  .................144
Front Heated Seat Circuit Inspection 3  .................146
Front Heated Seat Switch Ground Circuit Inspection .147
Rear Power Seat Control Unit Power Supply Circuit 
Inspection 1 ...........................................................148
Rear Power Seat Control Unit Power Supply and 
Ground Circuit Inspection  .....................................149
Rear Power Seat Switch (Heater Switch) Ground 
Circuit Inspection  ..................................................150
Rear Heated Seat Circuit Inspection 1 ..................151
Rear Heated Seat Circuit Inspection 2 ..................152
Rear Heated Seat Circuit Inspection 3 ..................153
Rear Heated Seat Switch Low Circuit Inspection .155
Rear Heated Seat Switch High Circuit Inspection .156
Rear Heated Seat Ground Circuit Inspection ........157

CLIMATE CONTROLLED SEAT  .............................158

System Description  ...............................................158
Component Parts and Harness Connector Location .161
Schematic – AHEAT –  ..........................................162
Wiring Diagram –C/SEAT–  ...................................163
Terminal and Reference Value For Climate Con-
trolled Seat Control Unit ........................................168
Work Flow  .............................................................169
Preliminary Check  .................................................169
Trouble Diagnoses Symptom Chart  ......................170