1991 LEXUS SC400 Service Repair Manual

deactivate airbag language door lock clock engine coolant water pump

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LEXUS SC400 1991 Service Repair Manual
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Page 3066 of 4087

$LEXUS SC400 1991 Service Repair Manual HOW TO PROCEED WITH TROUBLESHOOTING Perform troubleshooting in accordance with the procedure on the following page.\ CUSTOMER PROBLEM ANALYSIS Using the customer problem analysis check sheet for$

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LEXUS SC400 1991 Service Repair Manual
CUSTOMER PROBLEM ANALYSIS
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Page 3068 of 4087

LEXUS SC400 1991 Service Repair Manual
WIRING DIAGRAM
TILT & TELESCOPIC ECU
SR±46±
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LEXUS SC400 1991 Service Repair Manual
SC300 (M/T)
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Page 3070 of 4087

LEXUS SC400 1991 Service Repair Manual
TERMINAL OF ECU
TILT & TELESCOPIC ECU

Terminal
No.

Symbol

Terminal Name

Ter

TERMINAL OF ECU
TILT & TELESCOPIC ECU

Terminal
No.

Symbol

Terminal Name

Terminal
No.

Symbol

Terminal Name
T9±1 Si Serial In T9±16 MSW Manual Switch
2 DSW Door Courtesy Switch 17 Vc Sensor Power Source
3 M1 Return Switch 1 18 ECU±B Power Source

4

ASW

Auto Switch

T10± 1

IG

Ignition Switch
5 E1 Sensor Ground 2 Te M+ Telescopic Contracted
6 Te S Telescopic Sensor 3 TiM± Tilt Down

7
TiS
Tilt Sensor
4
+B
Power Source

8

ECU±E

Ground

6

P

Park/Neutral Position Switch
9 So Serial Out 6 P Parking Brake Switch*
10 UWSW Unlock Warning Switch 7 GND Ground

11

MRY

Memory Switch

10

TiM+

Tilt Up
12 M2 Return Switch 2 11 TiM± Telescopic Extended
*
SC300 (M/T) Models
SR±48
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Page 3071 of 4087

LEXUS SC400 1991 Service Repair Manual
STANDARD VALUE OF ECU TERMINAL

Terminals

Symbols

Wiring
Color

Condition

STANDARD VALUE OF ECU TERMINAL

Terminals

Symbols

Wiring
Color

Condition

Standard
Value

T9±1

Si

B

Tilt & telescopic ECU & power seat ECU
communication

0 V
e12 V
T9±2 e DSW e R±Be Driver's door open Below 1 V

T9 2 e
Body Ground
DSW e
Body Ground
RBe
Body GroundDriver's door closed1014 V
T9±3 eT9±8 M1 eECU±E Pe BR±B Driving position memory & return switch ON Below 1 V
T9±3eT9±8 M1eECU±E PeBR±B Driving position memory & return switch OFF 10
~ 14 V
T9±4
eT9±5 ASW eE1 V±W eBR Unlock warning switch ON, auto switch ON 10 ~ 14 V
T9±4eT9±5 ASWeE1 V±WeBR Unlock warning switch ON, auto switch OFF Below 1 V
T9±5 E1 BR Always Below 1 V

T9±6
eT9±5

Te S
eE1

Y±R
eBR

Unlock warning switch ON, telescopic fully
forward

Below 2 V

T9±6eT9±5

TeSeE1

Y±ReBR
Unlock warning switch ON, telescopic fully
backward 4±6 V

T9±7
eT9±5

TiS eE1

P±L eBR
Unlock warning switch ON, tilt fully raised Below 2 V T9±7eT9±5 TiSeE1 P±LeBR Unlock warning switch ON, tilt fully lowered 4±6 V T9±8 ECU±E BR±B Always Below 1 V

T9±9

So

W

Tilt & telescopic ECU & power seat ECU
communication

0 V
e12 V
T9±10 e UWSW e Ye Ignition key inserted in the key cylinder Below 1 V
T9 10 e
Body Ground UWSW e
Body Ground Ye
Body Ground Ignition key pulled out from the key cylinder 10
~ 14 V

T9±11 eT9±8

MRY eECU±E

R±Y eBR±B
Auto set switch ON Below 1 V
T9±11eT9±8 MRYeECU±E R±YeBR±B Auto set switch OFF 10 ~ 14 V

T9±12 eT9±8

M2 eECU±E

P±B eBR±B
Driving position memory & return switch ON Below 1 V
T9±12eT9±8 M2eECU±E P±BeBR±B Driving position memory & return switch OFF 10 ~ 14 V

Unlock warning switch ON
Telescopic extend by manual switch

2.6 V

Unlock warning switch ON
Tilt up by manual switch

3.5 V
T9±16
eT9±17 MSW eVC V±Y eR±W Unlock warning switch ON
Telescopic contracted by manual switch 4.2 V

Unlock warning switch ON
Tilt down by manual switch

4.6 V

Unlock warning switch ON, manual switch
OFF

4±6 V
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STANDARD VALUE OF ECU TERMINAL

Terminals

Symbols

Wiring
Color

Condition

Standard
Value
T9±17 eT9±5 Vc eE1 R±W eBR Unlock warning switch ON 4±6 V
T9±17eT9±5 VceE1 R±WeBR Unlock warning switch OFF Below 1 V
T9±18 ECU±B R Always 10 ~ 14 V
T10±1 e IGe B±R e Ignition switch ON 10 ~ 14 V

T10 1 e
Body Ground
IGe
Body Ground
BR e
Body Ground Ignition switch OFF Below 1 V

T10±2
e
Body Ground

Te M+e
Body Ground

L±B
e
Body Ground

Unlock warning switch ON, telescopic
forward

10 ~ 14 V
Body Ground Body Ground Body Ground Except above mention Below 1 V
T10±3
e TiM±e R±Le Unlock warning switch ON, tilt down 10 ~ 14 V

T10 3 e
Body Ground
TiMe
Body Ground
RLe
Body Ground Except above mention Below 1 V
T10±4 +B L±W Always 10 ~ 14 V
T10±6 e Pe GR e Ignition switch ON, shift lever ªPº position 10 ~ 14 V

T10 6 e
Body Ground
Pe
Body Ground
GR e
Body Ground Ignition switch ON, except above mention Below 1 V
T10±6 e Pe GR e Ignition switch ON, PKB lever pulled Below 1 V

T10 6 e
Body Ground
Pe
Body Ground
GR e
Body Ground Ignition switch ON, PKB lever released 10 ~ 14 V
T10±7 GND W±B Always Below 1 V
T10±10 e TiM+e R±Be Unlock warning switch ON, tilt up 10 ~ 14 V

T10 10 e
Body Ground
TiMe
Body Ground
RBe
Body Ground Except above mention Below 1 V
T10±11 e
Body Ground
Te M±e
Body Ground
L±Ye
Body Ground
Unlock warning switch ON, telescopic
backward 10 ~ 14 V
Body Ground Body Ground Body Ground Except above mention Below 1 V
TILT & TELESCOPIC ECU
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