Lexus SC300 / Lexus SC400. Manual - part 789

(d)  Wrap the remaining part of sleeve with half of the tape

overlapping at each turn.

(e)  Firmly wrap the tape 2 times or more about 10 mm (0.39 in.)

from the other end of the pressure–contact sleeve, then wrap
the tape back towards the start again and firmly finish winding
the tape around the center of the sleeve.

(f) 

Fix the corrugated tube to the wire using silicon tape.

(g) After 

applying 

the 

silicon tape, apply vinyl tape on the

corrugated tube of repair wire side over to the corrugated
tube of vehicle wire harness side.

5.  CONNECT NEGATIVE (–) TERMINAL CABLE TO

BATTERY

–

SUPPLEMENTAL RESTRAINT SYSTEM

WIRE HARNESS AND CONNECTOR

RS–51

– MEMO –

RS–52

–

SUPPLEMENTAL RESTRAINT SYSTEM

WIRE HARNESS AND CONNECTOR

TROUBLESHOOTING

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HOW TO PROCEED WITH

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TROUBLESHOOTING

RS–54

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CUSTOMER PROBLEM ANALYSIS

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CHECK SHEET

RS–58

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DIAGNOSIS INSPECTION

RS–59

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SYMPTION SIMULATION

RS–65

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DIAGNOSTIC TROUBLE CODE MATRIX

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CHART

RS–67

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PROBLEM SYMPTOM CHART

RS–67

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CIRCUIT INSPECTION

RS–68

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DTC (Normal)

RS–68

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DTC 11

RS–70

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DTC 12

RS–78

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DTC 13

RS–85

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DTC 14

RS–92

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DTC 15

RS–97

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DTC 22

RS–102

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DTC 31

RS–108

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DTC 53

RS–110

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DTC 54

RS–115

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SRS Warning Light System

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(Always Lit Up, when ignition switch

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is Lock position)

RS–119

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Tc Terminal Circuit

RS–121

–

SUPPLEMENTAL RESTRAINT SYSTEM

TROUBLESHOOTING

RS–53

HOW TO PROCEED WITH TROUBLESHOOTING

Malfunction symptoms of the supplemental restraint system are difficult to confirm, so the diagnostic
trouble codes become the most important source of information when troubleshooting. Perform trouble-
shooting of the supplemental restraint system in accordance with the following procedure:
HINT: Do not disconnect the battery negative (–) terminal cable until step 



, Diagnostic Trouble Code

Check and Recording, has been completed.

 CUSTOMER PROBLEM ANALYSIS

Using the CUSTOMER PROBLEM ANALYSIS CHECK SHEET (See page 

RS–58

) for reference, ask the

customer in as much detail as possible about the problem.

 WARNING LIGHT CHECK

Check the SRS warning light. If the light remains on, a malfunction is stored in the center airbag sensor,
assembly, so proceed to step 



. If the SRS warning light is not on, a malfunction has occurred in the SRS

warning light circuit, so perform troubleshooting for 22.
HINT: 22 is recorded when a malfunction occurs in the SRS warning light system.
If an open malfunction occurs in the SRS warning light system, the SRS warning light does not light up,
so that until the malfunction is repaired, the diagnostic trouble codes (including 22) cannot be confirmed.



 DIAGNOSTIC TROUBLE CODE CHECK AND RECORDING

Check the diagnostic trouble codes and make a note of any malfunction codes which are output. If a normal
code is output, an abnormality in the power source circuit may have occurred, so perform troubleshooting
for source voltage in step 



.

If 22 is output, skip steps 



 and 



 and proceed to step 



.



 MALFUNCTION CODE CLEARANCE

Clear the malfunction code.
HINT: The malfunction code output in step 



 indicates that a malfunction has occurred in the circuit desig-

nated by the malfunction code, but does not indicate whether the malfunction is still occurring or whether
it was in the past.
Accordingly, it is necessary to find out the present condition of the malfunction occurrence by clearing the
malfunction code and performing the diagnostic code check again. If this operation is neglected and trou-
bleshooting is performed using only the malfunction code confirmed in step 



, isolating the problem com-

ponent becomes difficult and invites mistaken diagnosis.



 DIAGNOSTIC TROUBLE CODE CHECK AND RECORDING 



 SYMPTOM SIMULATION

After repeating ignition switch ON–OFF operation (ON: wait 20 secs, OFF: wait 20 secs.) 5 times, check
the diagnostic trouble codes. If any code is output, the malfunction is still occurring, so proceed to step 



.

Bearing in mind that a malfunction code was registered in step 



, provided that the normal code is present-

ly output, use the methods described in step 



 to simulate the malfunction.

RS–54

–

SUPPLEMENTAL RESTRAINT SYSTEM

TROUBLESHOOTING