ECU LEXUS SC400 1991 Service Service Manual

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Automatic Control Switch Circuit
CIRCUIT DESCRIPTION
The SW contact is ON while the automatic control SW is pushed, and
turns OFF when automatic control SW is released. When the SW is
turned
ON, the voltage at the SAUTO terminal of A/C control assem-
bly is almost 0 V and the ECU begins fully automatic control of the
blower speed, air inlet, air outlet and compressor operation.
DIAGNOSTIC CHART
Check voltage between terminal SAUTO
and SG of A/C control assembly.
Check automatic control SW.
Check for open and short in harness and
connector between automatic control SW
and ECU.
Check and replace A/C control assembly.
Proceed to next circuit inspection on
matrix chart(See page AC-36).
Replace automatic control SW.
Repair or replace harness or
connector.
AC±96±
AIR CONDITIONING SYSTEM Troubleshooting
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BLOWER MOTOR
REMOVAL OF BLOWER MOTOR
1. REMOVE GLOVE BOXSee page BO±112
2. REMOVE ECU COVER
(a) Lift up the front end of the carpet on the passenger side.
(b) Remove the two nuts and the cover.
3. REMOVE CONNECTOR BRACKET Remove the two screws and the bracket.
4. REMOVE MOTOR (a) Disconnect the connector.
(b) Remove the three screws and the motor.
INSPECTION OF BLOWER MOTOR
See page AC±81
INSTALLATION OF BLOWER MOTOR
1. INSTALL MOTOR
(a) Install the motor with three screws.
(b) Connect the connector.
2. INSTALL CONNECTOR BRACKET
3. INSTALL ECU COVER
4. INSTALL GLOVE BOX
±
AIR CONDITIONING SYSTEM Blower MotorAC±129
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A/C CONTROL ASSEMBLY
(A/C ECU)
REMOVAL OF A/C CONTROL ASSEMBLY
1. REMOVE RADIO AND A/C CONTROL ASSEMBLYSee page BO±112
2. REMOVE A/C CONTROL ASSEMBLY Remove four screws and the A/C control assembly.
INSPECTION OF A/C CONTROL
ASSEMBLY
Judge whether the system is satisfactory or not based on the
ºTroubleshootingº procedure on page AC±21.
INSTALLATION OF A/C CONTROL
ASSEMBLY
1. INSTALL A/C CONTROL ASSEMBLY TO RADIO
Install the A/C control assembly to the radio with four screws.
2. INSTALL RADIO AND A/C CONTROL ASSEMBLY See page BO±112
AC±138
±
AIR CONDITIONING SYSTEM A/C Control Assembly (A/C ECU)
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OKNG
1
2
3
4
5
6
6
OK
OK
YES
YES NG
NG NO
NO
Check connection of center airbag sensor
assembly connector.
Preparation.
Check airbag warning light circuit.
Does airbag warning light come on?
Is new ECU ±B fuse burnt out again? GO to step
Repair.
Repair airbag warning light circuit
(See page BE±150).
Check terminal LA of center
airbag sensor assembly and
electrical connection check
mechanism. If normal, replace
center airbag sensor assembly.
Using simulation method,
reproduce malfunction symptoms
(See page IN±20).
Check harness between ECU ±B fuse and
airbag warning light, and ECU±B fuse and
center airbag sensor assembly. From the results of the above inspection,
the malfunctioning part can now be
considered normal. To make sure of this,
use the simulation method to check.
Check ECU ±B fuse.
DIAGNOSTIC CHART
Troubleshooting for this system is different for when the airbag warning light does not light up and for
when diagnostic code 22 is output. Confirm the problem symptoms first before\
selecting the appropriate
troubleshooting procedure.
HINT: If airbag warning light does not light up, perform the following troub\
leshooting:
±
SRS AIRBAG TroubleshootingAB±75
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Check ECU±B fuse.
NG
OK
1
6Go to step
(1) Disconnect battery negative (±) terminal cable, and wait at least 20 seconds.
(2) Remove steering wheel pad (See page AB±14).
When storing steering wheel pad, keep upper
surface of pad facing upward.
NG
OKRepair.
Check connection of center airbag sensor assembly connector.2
3Preparation.
INSPECTION PROCEDURE
HINT: If airbag warning light does not light up, perform the following troubl\
eshooting:
±
SRS AIRBAG TroubleshootingAB±77
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4
5
6
Check terminal LA of center airbag sensor assem-
bly and electrical connection check mechanism.
If normal, replace center airbag sensor assembly.
NG
OK
(1) Disconnect negative (±) terminal cable from battery.
(2) Connect center airbag sensor assembly.
(3) Connect negative (±) terminal cable to battery.
(4) Turn ignition switch ACC or ON. Voltage: 10±14 V
Check operation of airbag warning light.
(1) Disconnect center airbag sensor assembly.
(2) Connect negative (±) terminal cable to battery.
(3) Turn ignition switch ACC or ON.
Measure voltage LA terminal of harness side
connector of center airbag sensor assembly.
Repair airbag warning light circuit
(see page BE±150).
NG
Using simulation method, reproduce
malfunction symptoms (See page In±20).NG
OK
Check airbag warning light circuit.
Does airbag warning light come on?
Is new ECU±B fuse burnt out again?
From the results of the above inspection, the malfunctioning part can now be considered norm\
al. To
make sure of this, use the simulation method to check.
Check harness between ECU±B fuse and airbag warning light, and ECU±B fus\
e and center airbag sensor
assembly.
AB±78±
SRS AIRBAG Troubleshooting
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OK
Check operation of airbag warning light.
NG1
WIRING DIAGRAM
2Is diagnostic code 41 output again? System is normal.
Check harness between ECU±B
fuse and center airbag sensor as-
sembly. If normal, replace center
airbag sensor assembly.
Perform troubleshooting according to
malfunction code output. NO
YES
Diag. Code 41Malfunction Stored in Memory
CIRCUIT DESCRIPTION
If a malfunction occurs in the airbag system, malfunction codes 11 to 31 may be output, and when the
battery is disconnected after the malfunction is repaired, malfunction codes 11 to 31 will be cleared,
but code 41 will be output instead.
So long as the cancellation operation for a malfunction stored in memory (\
See page
AB±32) is not per-
formed, code 41 is stored in the center airbag sensor assembly and the airbag w\
arning light remains
lit up.
Code No.Diagnosis
41
Malfunction recorded in memory.41
Center airbag sensor assembly malfunction.
DIAGNOSTIC CHART
AB±82±
SRS AIRBAG Troubleshooting
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Clear malfunction code 41 stored in memory
(See page AB±32).
Check operation of airbag warning light.
NG
OK
1
Airbag warning light turns off.
(1) Turn ignition switch LOCK, and wait at least
2 seconds.
(2) Turn ignition switch ACC or ON, and wait at least 20 seconds.
(3) Check operation of airbag warning light.
System is normal.
2Is diagnostic code 41 output again?
(1) Turn ignition switch ACC or ON, and wait at least 20 seconds.
(2) Using SST, connect terminals Tc and E
1 of TDCL.
SST 09843±18020
(3) Check diagnostic code.
Check harness between ECU±B fuse and center
airbag sensor assembly. If normal, replace
center airbag sensor assembly.
Perform troubleshooting according to malfunction code output.
NG
OK
INSPECTION PROCEDURE
±
SRS AIRBAG TroubleshootingAB±83
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FRONT AIRBAG SENSOR
1. Never reuse the front airbag sensors involved in a collisionwhen the airbag has deployed. (Replace both the left and
right airbag sensors.)
2. Install the front airbag sensor with the arrow on the sensor facing toward the front of the vehicle.
3. The front airbag sensor set bolts have been anti±rust treated. When the sensor is removed, always replace the set bolts
with new ones.
4. The front airbag sensor is equipped with an electrical connection check mechanism. Be sur\
e to lock this mechanism securely when connecting the connector. If the connector is not securely locked, a malfunction
code will be detected by the diagnosis system (See page AB±7).
SPIRAL CABLE (in COMBINATION SWITCH)
The steering wheel must be fitted correctly to the steering column with the\
spiral cable at the neutral posi-
tion, otherwise cable disconnection and other troubles may result. Refer to pa\
ge AB±17 of this manual con-
cerning correct steering wheel installation.
STEERING WHEEL PAD (with AIRBAG)
1. When removing the steering wheel pad or handling a new steering wheel pad, it should be placed with the pad top
surface facing up.
In this case, the twin±lock type connector lock lever should be
in the locked state and care should be taken to place it so the
connector will not be damaged. And do not store a steering
wheel pad on top of another one. (Storing the pad with its me-
tallic surface up may lead to a serious accident if the airbag
inflates for some reason.)
2. Never measure the resistance of the airbag squib. (This may cause the airbag to deploy, which is very dangerous.)
AB±3SRS AIRBAG ± General Description
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6. AIRBAG CONNECTORSAll connectors in the airbag system are colored yellow to distinguish them \
from other connectors. Connec-
tors having special functions and specifically designed for airbags are used\
in the locations shown below
to ensure high reliability. These connectors use durable gold±plated terminals.
Terminal Twin±Lock Mechanism
Airbag Activation Prevention Mechanism
Electrical Connection Check Mechanism
Connector Twin±Lock Mechanism
(1) Terminal Twin±Lock MechanismEach connector has a two±piece construction consisting
of a housing and a spacer. This design secures the lock-
ing of the terminal by two locking devices (the spacer
and the lance) to prevent terminals from coming out.
(2) Airbag Activation Prevention Mechanism Each connector contains a short spring plate. When the connector is disconnected, the short spring
plate automatically connects the power source and grounding terminals of the \
squib.
AB±6SRS AIRBAG ± Operation
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