Lexus SC300 / Lexus SC400. Manual - part 788

WIRE HARNESS AND CONNECTOR

RS01B–02

HINT: The SRS wire harness is integrated with the cowl wire
harness assembly and floor wire harness assembly.
The wires for the SRS wire harness are encased in a yellow
corrugated tube and all the connectors in the system are a
standard yellow color.

INSPECTION ITEMS

RS01C–0A

1. 

VEHICLES NOT INVOLVED IN A COLLISION
Perform a diagnostic system check.
(See page 

RS–59

)

2. 

VEHICLES INVOLVED IN A COLLISION

(a)  Perform a diagnostic system check.

(See page 

RS–59

)

(b) If 

there is a break in any of the wires in the SRS wire harness,

or if conductors are exposed.

(c)  In the SRS wire harness connectors are cracked or chipped.

–

SUPPLEMENTAL RESTRAINT SYSTEM

WIRE HARNESS AND CONNECTOR

RS–47

REPLACEMENT REQUIREMENTS

RS01D–07

In the following cases, replace the wire harness or connector.

•

If any part of the SRS wire harness or any connector has
been found to be faulty in troubleshooting.

•

If any part of the SRS wire harness or any connector has
been found to be faulty during the check in items 2–(b)
or (c).

NOTICE:

•

If the wire harness used in the SRS is damaged, replace

the whole wire harness assembly.

•

When the connector to the WIRE HARNESS AND CON-

NECTORs can be repaired alone (when there is no

damage to the wire harness), use the repair wire specially

designed for the purpose.

SENSOR REPLACEMENT

REPAIR WIRE FOR FRONT AIRBAG

RS04A–01

Repair wire with 2 pressure–contact sleeves
(Part No. 82988–24010) has been prepared for exclusive
use in repairing connector damage etc. caused by frontal col-
lision of the vehicle.
When repairing the WIRE HARNESS AND CONNECTOR
connector on the wire harness side, always use the special
repair wire.

NOTICE: Do not replace the connector housing or termi-
nal only.

1. 

DISCONNECT NEGATIVE (–) TERMINAL CABLE FROM
BATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the “LOCK” posi-
tion and the negative (–) terminal cable is disconnected
from the battery.
(See page 

RS–2

)

2. 

DISCONNECT WIRE HARNESS AT VEHICLE SIDE

(a)  Remove the cover at the rear of the connector housing and

expose the wire harness.

(b)  Cut the wire harness behind the connector housing.

HINT: The operation is performed more easily if the wire har-
ness is left as long as possible.

RS–48

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SUPPLEMENTAL RESTRAINT SYSTEM

WIRE HARNESS AND CONNECTOR

3.  CONNECT WIRE HARNESS AND CONNECTOR WIRE

HARNESS AT VEHICLE SIDE AND REPAIR WIRE

(a)  Start stripping at least 8 mm (0.31 in.) to 11 mm (0.43 in.)

away from the end of the existing harness at vehicle side and
also from the end of the repair wire.
NOTICE: Take care not to damage the wire when strip-
ping the wire harness lead. After finishing the operation,
visually inspect the wire. If there is any damaged, per-
form the operation again.

(b)  Overlap the 2 stripped wire ends inside of the

pressure–contact  sleeve as illustrated in the left.
HINT: The blue pressure–contact sleeve
(Part No. 82999–12020) is available individually.

HINT: You might find it easier if you use a miniature screwdriv-
er as a guide as you insert wires into the sleeve.

(c)  The crimping tool (AMP Part No. 169060) has color marks on

it. Place the sleeve in the correct section of the tool according
to the color of the sleeve itself.

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SUPPLEMENTAL RESTRAINT SYSTEM

WIRE HARNESS AND CONNECTOR

RS–49

(d)  With the center of the sleeve correctly placed between the

crimping jaws, squeeze the crimping tool until either end
comes into contact at the section marked by “CLOSE HERE”.
HINT: Check to see that the sleeve and wires are still in the
correct position before closing the crimping tool ends with
steady pressure.

(e)  Pull the joined wires to either end. Make sure that they are

joined firmly by the sleeve.
NOTICE: If the joined wires come loose the splice is de-
fective, so replace the sleeve and repeat the procedure.

(f)  Crimp both ends of the sleeve with the crimping tool at the

“INS” position.

4. 

PROTECT JOINED SECTION
Wrap silicon tape around the joins to protect them from water.
HINT:

•

Before starting the operation, throughly wipe dirt and
grease off the sections to be joined.

•

If the adhesive surfaces of 2 tapes come in contact, they
will stick together and will not come apart, so do not
remove the backing film except when using the tape.

•

Do not let oil and dust, etc., get on the tape surface.

(a)  Ready about 100 mm (3.94 in.) of silicon tape

(Part No. 08231–00045) and peel off the film.

(b)  Stretch the silicon tape until its width is reduced by half.
(c)  About 10 mm (0.39 in.) from the end of the pressure contact

sleeve, wrap the silicon tape around the sleeve 3 or more
times while stretching the tape.

RS–50

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SUPPLEMENTAL RESTRAINT SYSTEM

WIRE HARNESS AND CONNECTOR