display TOYOTA TERCEL 1996 Service Owner's Manual

DI4M7-02
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-151
1996 TERCEL (RM440U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below (Proceed to the page given for that circuit.).
DTC No.
(See Page)Detection ItemTrouble AreaSRS
Warning Light
Nl
System normal-OFFNormal
(DI-177)
Source Voltage drop
Battery

Airbag sensor assemblyON
11
(DI-155)

Short in squib circuit (to ground)
Steering wheel pad (D squib)

Front passenger airbag assembly (P squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
12
(DI-162)

Short in squib circuit (to B+)
Steering wheel pad (D squib)

Front passenger airbag assembly (P squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
14
(DI-168)

Open in D squib circuit
Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
31
(DI-172)
Airbag sensor assembly malfunction
Airbag sensor assemblyON
54
(DI-174)
Open in P squib circuit
Front passenger airbag assembly (P squib)

Airbag sensor assembly

Wire harness
ON
HINT:

When the SRS warning light remains lit up and the DTC is the normal code, this means a source voltage
drops.
This malfunction is not stored in memory by the airbag sensor assembly and if the power source volt-
age returns to normal, the SRS warning light will automatically go out.

When 2 or more codes are indicated, the codes will be displayed in numeral order starting from the
lowest numbered code.

If a code not listed on the chart is displayed, the airbag sensor assembly is faulty.

DI4MA-01
DI-154
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
SymptomSuspect AreaSee page

With the ignition switch at ACC or ON, the SRS warning light
sometimes lights up after approx. 6 seconds have elapsed.

SRS warning light is always lit up even when ignition switch is in
the LOCK position.

SRS warning light system malfunction
(Always lit up when ignition switch is in LOCK position.)DI-180

With the ignition switch at ACC or ON, the SRS warning light
does not light up.
SRS warning light system malfunction
(Does not light up, when ignition switch is turned to ACC
or ON.)
DI-182

DTC not displayed.

SRS warning light is always lit up a DTC check procedure.

DTC displayed without Tc and E1 terminal connection.

Tc terminal circuitDI-185

R14285 AB0119H00021
Airbag Sensor Assembly ON
IG2 ACC
(+) (-)
DI-172
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
DTC 31 Airbag Sensor Assembly Malfunction
CIRCUIT DESCRIPTION
The airbag sensor assembly consists of a airbag sensor, safing sensor, drive circuit, diagnosis circuit and
ignition control, etc.
It receives signals from the airbag sensor, judges whether or not the SRS must be activated, and diagnostic
system malfunction.
DTC 31 is recorded when occurrence of a malfunction in the airbag sensor assembly is detected.
DTC No.DTC Detection ConditionTrouble Area
31
Airbag sensor assembly malfunction
Airbag sensor assembly
INSPECTION PROCEDURE
HINT:
When a malfunction code other than code 31 is displayed at the same time, first repair the malfunction indi-
cated by the malfunction code other than code 31.
1 Preparation (See step 1 on page DI-177)
2 Check voltage at IG2 and ACC of airbag sensor assembly.
PREPARATION:
(a) Connect negative (-) terminal cable to battery.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals IG2 and ACC of airbag
sensor assembly and body ground.
OK:
Voltage: Below 16 V
NG Check battery and charging system (See page
CH-2).
OK
DI4MF-02

H09396
MAIN
FL
B
ALT
B-RB-R
2 2
Engine
Room
R/B
AM1
W-GDriver Side J/B
1
1J
1BW-G 2ACC
AM13
B-Y4
1B
1H
CIG/RADIO Driver Side J/B
G-R*1
10
ACCAirbag
Sensor
Assembly
8
*2
B-OIG2 *1
9
7
*2 2
1H 1B5
IGN B-W 6
AM2
Ignition
Switch 7 B-R 12
IC1 B-R
2
AM2
EA2 1
B*1: USA
*2: CANADA EA214
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-177
1996 TERCEL (RM440U)
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly in
case the source voltage drops.
When the battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the
voltage of the SRS to normal voltage.
The diagnosis system malfunction display for this circuit is different to other circuits-when the SRS warning
light remains lit up and the DTC is a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the airbag sensor assembly and the source voltage returns to
normal, the SRS warning light automatically goes off.
DTC No.DTC Detection ConditionTrouble Area
(Normal)Source voltage drop.
Battery

Airbag sensor assembly
WIRING DIAGRAM
DI4MI-02

R15076
F6
B
EA2 B-R
MAIN
FL
Battery ALT13 Driver Side J/B
SRS
1J
F7 12
B-R1
1E
4 8 5
Tc LA B-Y R-G
*1
12 1F
1F
1F
1F 1KSRS Warning Light
45
B-Y
*2
AB DLC1
11 P-B
P-B P-BEA1Tc
(w/ Front Passenger Airbag)
*1: LA - 8
*2: Tc - 7
(w/o Front Passenger Airbag)
*1: LA - 6
*2: Tc - 5Airbag Sensor
Assembly
IG1
B-Y
B-Y4
7
5 DI-180
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
SRS Warning Light System Malfunction (Always lit up when igni-
tion switch is in LOCK position.)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from the LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.
When terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-
ing light.
WIRING DIAGRAM
DI4MJ-02

N14677
Fuse
DI-182
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
SRS Warning Light System Malfunction (Does not light up when
ignition switch is turned to ACC or ON.)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality
When terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-
ing light.
WIRING DIAGRAM
Refer to page DI-180 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Check SRS Fuse.
PREPARATION:
Remove SRS fuse.
CHECK:
Check continuity of SRS fuse.
OK:
Continuity
HINT:

Fuse may be burnt out even if it appears to be OK during
visual inspection.

If fuse is OK, install it.
NG Go to step 5.
OK
2 Preparation. (See step 1 on page DI-177)
DI4MK-02

R15077
Airbag Sensor
Assembly
4
IK*1 2
Tc DLC1
E18
AA
BR
EA1Driver Side J/B
311P-B BR
ECJunction
ConnectorP-B P-B
IF
Tc
(w/ Front Passenger Airbag)
*1: Tc - 7
(w/o Front Passenger Airbag)
*1: Tc - 5
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-185
1996 TERCEL (RM440U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminals Tc and E1 of the DLC1 the airbag sensor assembly is set in the DTC output mode.
The DTCs are displayed by the blinking of the SRS warning light.
WIRING DIAGRAM
DI4ML-02

AB0117 AB0118 AB0119H00270
LOCKACCON
or
AB0118
R14305AB0119
H00030
ACCON
or
E1
Tc
(+) (-)DLC1
DI-186
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
HINT:
If the DTC is not displayed, do the following troubleshooting.
1 Does SRS warning light up for approx. 6 seconds?
CHECK:
Check operation of SRS warning light after ignition switch is
turned from LOCK position to ACC or ON position.
NO Check SRS warning light system.
(See page DI-180, DI-182)
YES
2 Check voltage between terminals Tc and E1 of DLC1.
PREPARATION:
Turn ignition switch to ACC or ON.
CHECK:
Measure voltage between terminals Tc and E1 of DLC1.
OK:
Voltage: 10 - 14 V
OK Go to step 4.
NG

AB0117
R14303
H00033
Airbag Sensor Assembly
Tc
LOCK
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-189
1996 TERCEL (RM440U)
If the DTC is displayed without a DTC check procedure, do the following trou-
bleshooting.
1 Check resistance between terminal Tc of airbag sensor assembly and body
ground.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least 90 seconds.
(c) Disconnect airbag sensor assembly connector.
CHECK:
Check resistance between terminal Tc of airbag sensor assem-
bly connector and body ground.
OK:
Resistance: 1MW or higher
NG Repair or replace harness or connector.
OK
Replace airbag sensor assembly.