TOYOTA SUPRA 1995 Service Repair Manual

(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.
(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 ºCLOSE HEREº.
HINT: Check to see that the sleeve and wires are still in the
correct position before closing the crimping tool ends with
steady pressure. RS±38
± SUPPLEMENTAL RESTRAINT SYSTEMWIRE HARNESS AND CONNECTOR

(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
ºINSº position.
3. PROTECT JOINED SECTION
Wrap silicon tape around the joins to protect them from water.
HINT:
wBefore starting the operation, thoroughly wipe dirt and
grease off the sections to be joined.
wIf 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.
wDo 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.
(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.
± SUPPLEMENTAL RESTRAINT SYSTEMWIRE HARNESS AND CONNECTORRS±39

(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. RS±40
± SUPPLEMENTAL RESTRAINT SYSTEMWIRE HARNESS AND CONNECTOR

TROUBLESHOOTING
RS±41

RS±43
RS±44
RS±44
RS±47
RS±44
RS±50
RS±48
RS±52 TO 101
RS±47
RS±44
Vehicle Brought to Workshop
Customer Problem Analysis
Warning Light Check
Diagnostic Trouble Code Check and Recording
Malfunction Code Clearance
Diagnostic Trouble Code Check and Recording
Diagnostic Trouble Code Matrix Chart
Symptom Simulation
Malfunction Code
Malfunction Code
Circuit Inspection
Identification of Problem
Repair
Malfunction Code Clearance
Malfunction Code
Normal Code
Normal Code
Normal
Code
Does Not Light Up
Remains ON
Malfunction Code
Normal Code
Conformation Test
Diagnostic Trouble Code Check
Diagnostic steps permitting the use of
The TOYOTA hand±held tester.
HOW TO PROCEED WITH TROUBLESHOOTING
RS±42± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTING

CUSTOMER PROBLEM ANALYSIS CHECK SHEET
 Supplemental Restraint System Check Sheet
Inspector 's
Name:
   Registration No. 
 Customer 's Name  Registration Year //
   Frame No. 
 
 
Date Vehicle
Brought In 
 //
 
 Odometer Reading
 
 
km
Miles
 
 
Date Problem First Occurred 
 //
 Weather 
Fine
Cloudy
Rainy
Snowy
Other_ _ _ _ _ _ _
 Temperature Approx.°C (°F) p A rox.C (F)
 
 
 
Vehicle Operation
 
 
 

Starting
Idling

Driving [
Constant speed
Acceleration
Deceleration

Other_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ]
 
 
 
Road Conditions
 
 
 
 
 
 
 
 
 
Details of Problem
 
 
 
 
 
 
 
 
 
 
 
 
 
Vehicle Inspection, Repair History
Prior to Occurrence of Malfunction
(Including Supplemental Restraint
System)
 
 
 
 
 
 
 
Diagnosis System Inspection
 
 SRS Warning Light
 
 1st Time
 
 
Remains ON
Sometimes Lights Up
Does Not Light Up
 Inspection 2nd Time 
Remains ON
Sometimes Lights Up
Does Not Light Up
 Diagnostic Trouble 1st Time 
Normal Code
Malfunction Code [Code ]
 Code Inspection 2nd Time 
Normal Code
Malfunction Code [Code. ]
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±43

DIAGNOSIS INSPECTION
SRS warning light check
(a) Turn the ignition switch to ACC or ON and check that the SRS
warning light lights up.
(b) Check that the SRS warning light goes out after approx. 6
seconds.
HINT:
wWhen the ignition switch is at ACC or ON and the SRS
warning light remains on or flashes, the center airbag
sensor assembly has detected a malfunction code.
wIf, after approx. 6 seconds have elapsed, the SRS
warning light sometimes lights up or the SRS warning
light light up even when the ignition switch is OFF, a
short in the SRS warning light circuit can be considered
likely. Proceed to ºSRS warning light systemº on page
RS±97.
Diagnostic trouble code check
Using diagnosis check wire:
1. OUTPUT DIAGNOSTIC TROUBLE CODE
(a) Turn the ignition switch to ACC or ON position and wait
approx. 20 seconds.
(b) Using SST, connect terminals Tc and E
1 of the DLC1 or
DLC2.
SST 09843±18020
NOTICE: Never make a mistake with the terminal connec-
tion position as this will cause a malfunction. RS±44
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTING

2. READ DIAGNOSTIC TROUBLE CODE
Read the 2±digit diagnostic trouble code as indicated by the
number of times the SRS warning light blinks. As an example,
the blinking patterns, normal, 11 and 31 are as shown on the
illustration.
wNormal code indication
The light will blink 2 times per second.
wMalfunction code indication
The number represented by the first blinking code out-
put indicates the first digit of a 2±digit diagnostic trouble
output.
After a 1.5 second pause, the second blinking code will
indicate the second digit.
If there are 2 or more codes, there will be a 2.5 second
pause between each code. After all the codes have
been output, there will be a 4.0 second pause and they
will all be repeated.
HINT:
wIn the event of a number of trouble codes, indication will
start from the smallest numbered code.
wIf it does not output a diagnostic trouble code or outputs
a diagnostic trouble code without terminal connection,
proceed to the Tc terminal circuit inspection on page
RS±99.
Using TOYOTA hand±held tester:
(a) Hook up the TOYOTA hand±held tester to the DLC1 or DLC2.
(b) Read the diagnostic trouble codes by following the prompts
on the tester screen.
HINT: Please refer to the TOYOTA hand±held tester opera-
tor 's manual for further details.
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±45

System normal

Source voltage drop

Short in squib circuit or front
airbag sensor circuit (to ground)

Front airbag sensor
center airbag sensor
assembly malfunction

Short in squib circuit (to B+)

Open in front airbag sensor
circuits

Short in driver airbag squib circuit
(between D+ wire harness and D±
wire harness)

Open in driver airbag squib circuit

Open in front airbag sensor circuit

SRS warning light system mal±
function

Center airbag sensor assembly
malfunction

Short in front passenger airbag
squib circuit

Open in front passenger airbag
squib circuit

Battery

Center airbag sensor assembly

Squib (driver airbag and front pas±
senger airbag)

Front airbag sensor

Spiral cable

Center airbag sensor assembly

Wire harness

Squib (driver airbag and front pas±
senger airbag)

Front airbag sensor

Spiral cable

Center airbag sensor assembly

Wire harness

Steering wheel pad (squib)

Spiral cable

Center airbag sensor assembly

Wire harness

Steering wheel pad (squib)

Spiral cable

Center airbag sensor assembly

Wire harness

Front airbag sensor

Center airbag sensor assembly

Wire harness

SRS warning light

Center airbag sensor assembly

Wire harness

Center airbag sensor assembly

Front passenger airbag assembly
(squib)

Center airbag sensor assembly

Wire harness

Front passenger airbag assembly
(squib)

Center airbag sensor assembly

Wire harness
HINT:
*
1
wWhen the SRS warning light remains lit up and the diagnostic trouble code is the normal code, this means
a source voltage drop.
This malfunction is not stored in memory by the center airbag sensor assembly and if the power source
voltage returns to normal, after approx. 10 seconds the SRS warning light will automatically go out.
*
2
wCode 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 code 22) cannot be con-
firmed.
wWhen 2 or more codes are indicated, the lowest numbered code will appear first.
wIf a code not listed on the chart is displayed, the center airbag sensor assembly is faulty. RS±46
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTING

Diagnostic trouble code clearance
Using diagnosis check wire:
(a) Connect the 2 service wires to terminals Tc and AB of DLC1
or DLC2.
(b) Turn the ignition switch to ACC or ON and wait approx. 6
seconds.
(c) Starting with the Tc terminal, apply body ground alternately
to terminal Tc and terminal AB twice each in cycles of 1.0
seconds. Confirm that body ground is absolute. Finally, keep
applying body ground to terminal Tc.
HINT: When alternately grounding terminals Tc and AB, re-
lease ground from one terminal and immediately apply it to
the other terminal within an interval of 0.2 second. If diagnos-
tic trouble codes do not clear, repeat the above procedure un-
til the codes are cleared.
(d) Several seconds after doing the clearing procedure, the SRS
warning light will blink in a 50 m sec. cycle to indicate the
codes have been cleared.
Using TOYOTA hand±held tester:
(a) Hook up the TOYOTA hand±held tester to the DLC1 or DLC2.
(b) Clear the diagnostic trouble codes by following the prompts
on the tester screen.
HINT: Please refer to the TOYOTA hand±held tester opera-
tor 's manual for further details.
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±47