1991 LEXUS SC400 Service Repair Manual

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Page 769 of 4087

$LEXUS SC400 1991 Service Repair Manual PRECHECK TYPE I In cases where the wireless door lock control system fails to operate only\ at a specific locality, perform this check at that locality. Open the drivers door (Other doors remain cl$

Page 770 of 4087

LEXUS SC400 1991 Service Repair Manual
Open the drivers door
(Other doors remain closed).
Using the door lock control switch, perform
ªlock, unlockº
*1 operation 10 times with in
30 seconds.
Soon (less than 2 secs.) after performing
t

Page 771 of 4087

$LEXUS SC400 1991 Service Repair Manual NGOK INSPECTION OF TRANSMITTER HINT: Perform this inspection only when transmitter is judged to be the fault\ y in precheck type II. 1Transmitter battery capacity check. C OK P HintThis inspection is$

Page 772 of 4087

LEXUS SC400 1991 Service Repair Manual
WIRING DIAGRAM
Check defogger wire (See page BE±173).NG
OK Repair defogger wire.
Replace antenna pinjack cable and
capacitor.1
INSPECTION OF ANTENNA CIRCUIT
Antenna Circuit
CIRCUIT DESCRIPTION

Page 773 of 4087

LEXUS SC400 1991 Service Repair Manual
PARTS REPLACEMENT
WIRELESS DOOR LOCK ECU REMOVAL
AND INSTALLATION
1. REMOVE WIRELESS DOOR LOCK ECU(a) Remove the rear seat.
(b) Remove the RH quarter trim panel.
(c) Disconnect the connectors.
(d

Page 774 of 4087

LEXUS SC400 1991 Service Repair Manual
(For malfunctioning ECU)
(a) Prepare the new ECU (without ROM).
(b) Remove the ECU from the vehicle.
(c) Remove the ROM from the ECU.
(d) Install the ROM into the new ECU.
(e) Install the new EC

Page 775 of 4087

LEXUS SC400 1991 Service Repair Manual
(c) Remove the O±ring and battery.
(d) Set the new battery and O±ring into the transmitter.
(e) Install the cover to the transmitter body taking care notto twist or displace the O±ring.
(f) Ti

Page 776 of 4087

LEXUS SC400 1991 Service Repair Manual
Terminals of ECU
WIRING DIAGRAM
No.SymbolTerminal NameNo.SymbolTerminal Name
W8±1+BPower SourceW8±6KSWKey Unlock Warning Switch
W8±2LSWD1Door Unlock Detection Switch LHW8±7EGround
W8±3LSWPDoor U

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