Page 1745 of 2000
SEAT BELT – SEAT BELT WARNING SYSTEMSB–7
SB
(f) After the buzzer has stopped, fasten the driver and
front passenger seat belts. Drive the vehicle at
approximately 25 km/h (16 mph) or more and
unfasten the driver or front passenger seat belt, and
then check that the buzzer sounds again.
(g) After the buzzer has stopped, move the shift lever to
the R position, and then move it to the D position.
Drive the vehicle at approximately 25 km/h (16 mph)
or more, and then check that the buzzer sounds
again.
Page 1746 of 2000
SB–8SEAT BELT – SEAT BELT WARNING SYSTEM
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PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of the
problem symptom. The potential causes of the symptoms are
listed in order of probability in the "Suspected Area" column
of the table. Check each symptom by checking the suspected
areas in the order they are listed. Replace parts as
necessary.
Seat belt warning system
Symptom Suspected area See page
Diver side seat belt warning light does not operate1. Front seat inner belt LHSB-12
2. Center airbag sensor assemblySB-12
3. Combination meterSB-12
4. Wire harnessSB-12
Front passenger side seat belt warning light does not
operate1. Front seat inner belt RHSB-15
2. Combination meterSB-15
3. Occupant detection sensorSB-15
4. Heater control panelSB-15
5. Wire harnessSB-15
Page 1747 of 2000
SEAT BELT – SEAT BELT WARNING SYSTEMSB–9
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TERMINALS OF ECU
1. CHECK COMBINATION METER ASSEMBLY
(a) Disconnect the E19 meter connector.
(b) Measure the voltage and resistance of the wire
harness side connector.
If the result is not as specified, there may be a
malfunction on the wire harness side.
2. CHECK HEATER CONTROL PANEL (for Automatic
Air Conditioning System)
(a) Disconnect the E23 panel connector.
C128516E02
Symbols (Terminal No.) Wiring Color Terminal Description ConditionSpecified Condition
B (E19-22) - Body ground R - Body Ground Power supply Always 10 to 14 V
IG+ (E19-21) - Body
groundB - Body Ground Power supply Ignition switch OFF Below 1 V
Ignition switch ON 10 to 14 V
PBLT (E19-1) - Body
groundLG - Body Ground Passenger seat belt signal Sit on passenger seat,
seat belt is fastenedBelow 1
Sit on passenger seat,
seat belt is unfastened10 k or higher
ET (E19-33) - Body
groundW-B - Body Ground Ground Always Below 1
B131599E01
Page 1748 of 2000

SB–10SEAT BELT – SEAT BELT WARNING SYSTEM
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(b) Measure the voltage and resistance of the wire
harness side connector.
If the result is not as specified, there may be a
malfunction on the wire harness side.
3. CHECK CLOCK ASSEMBLY (for Manual Air
Conditioning System)
(a) Disconnect the E22 clock connector.
(b) Measure the voltage and resistance of the wire
harness side connector.
If the result is not as specified, there may be a
malfunction on the wire harness side.
Symbols (Terminal No.) Wiring Color Terminal Description ConditionSpecified Condition
+B (E23-1) - Body ground R - Body Ground Power supply Always 10 to 14 V
IG+ (E23-2) - Body ground L - Body Ground Power supply Ignition switch OFF Below 1 V
Ignition switch ON 10 to 14 V
PBEW (E23-4) - Body
groundLG - Body Ground Passenger seat belt signal Sit on passenger seat,
seat belt is fastenedBelow 1
Sit on passenger seat,
seat belt is unfastened10 k or higher
GND (E23-7) - Body
groundW-B - Body Ground Ground Always Below 1
B131598E01
Symbols (Terminal No.) Wiring Color Terminal Description ConditionSpecified Condition
+B (E22-1) - Body ground R - Body ground Power supply Always 10 to 14 V
IG+ (E22-2) - Body ground L - Body ground Power supply Ignition switch OFF Below 1 V
Ignition switch ON 10 to 14 V
PBEW (E22-3) - Body
groundLG - Body ground Passenger seat belt signal Sit on passenger seat,
seat belt is fastenedBelow 1
Sit on passenger seat,
seat belt is unfastened10 k or higher
GND (E22-5) - Body
groundW-B - Body ground Ground Always Below 1
Page 1749 of 2000

SEAT BELT – SEAT BELT WARNING SYSTEMSB–11
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DIAGNOSIS SYSTEM
1. DESCRIPTION
(a) Data of the system can be read through the Data
Link Connector 3 (DLC3) of the vehicle.
Therefore, when the system seems to be
malfunctioning, use the intelligent tester to check for
a malfunction and repair it.
2. CHECK DLC3
(a) The vehicle's ECM uses ISO 15765-4
communication protocol. The terminal arrangement
of the DLC3 complies with SAE J1962 and matches
the ISO 15765-4 format.
HINT:
Connect the cable of the intelligent tester to the
DLC3, turn the ignition switch ON and attempt to
use the tester. If the display indicates that a
communication error has occurred, there is a
problem either with the vehicle or with the tester.
• If communication is normal when the tester is
connected to another vehicle, inspect the DLC3
of the original vehicle.
• If communication is still not possible when the
tester is connected to another vehicle, the
problem may be in the tester itself. Consult the
Service Department listed in the tester's
instruction manual.
H100769E31
B127989E07
Symbols (Terminal No.) Terminal Description Condition Specified Condition
SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
CG (4) - Body ground Chassis ground Always Below 1
SG (5) - Body ground Signal ground Always Below 1
BAT (16) - Body ground Battery positive Always 11 to 14 V
CANH (6) - CANL (14) HIGH-level CAN bus line Ignition switch OFF 54 to 69
CANH (6) - Battery positive HIGH-level CAN bus line Ignition switch OFF 1 M or higher
CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF 1 k
or higher
CANL (14) - Battery positive LOW-level CAN bus line Ignition switch OFF 1 M
or higher
CANL (14) - CG (4) LOW-level CAN bus line Ignition switch OFF 1 k
or higher
Page 1750 of 2000
SB–12SEAT BELT – SEAT BELT WARNING SYSTEM
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DATA LIST / ACTIVE TEST
1. ACTIVE TEST
HINT:
Performing the intelligent tester ACTIVE TEST allows
relay, VSV, actuator and other items to be operated
without removing any parts. Performing the ACTIVE
TEST early in troubleshooting is one way to save time.
The DATA LIST can be displayed during the ACTIVE
TEST.
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch ON.
(c) Perform the ACTIVE TEST according to the display
on the tester.
Center airbag sensor:
Item Test Details Diagnostic Note
D-BELT REMIND D-SEAT BELT warning light (OFF / ON) Confirm that the vehicle is stopped, engine
idling
P-BELT REMIND P-SEAT BELT warning light (OFF / ON) Confirm that the vehicle is stopped, engine
idling
Page 1751 of 2000

SEAT BELT – SEAT BELT WARNING SYSTEMSB–13
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ON-VEHICLE INSPECTION
1. CHECK DRIVER SIDE SEAT BELT WARNING LIGHT
(a) Turn the ignition switch ON.
(b) When the driver side seat belt is not fastened, check
that the combination meter's driver side seat belt
warning light starts blinking.
(c) When the seat belt is fastened, check that the
combination meter's driver side seat belt warning
light turns off.
2. CHECK PASSENGER SIDE SEAT BELT WARNING
LIGHT
(a) Turn the ignition switch ON.
(b) When the front passenger seat belt is not fastened,
check that the heater control panel's front
passenger side seat belt warning light starts
blinking.
(c) When the front passenger seat belt is fastened,
check that the heater control panel's front
passenger side seat belt warning light turns off.
3. CHECK SEAT BELT WARNING BUZZER
(a) Turn the ignition switch ON.
(b) After turning the ignition switch ON, if the vehicle is
driven at 20 km/h (12.4 mph) or more and the driver
side or front passenger side seat belt is not
fastened, check that the combination meter's buzzer
sounds at 1.2 second intervals for 30 seconds.
(c) 30 seconds after the buzzer first sounds, check that
the buzzer sounds at 0.4 second intervals for 90
seconds.
(d) 120 seconds after the buzzer has first sounded,
check that the buzzer stops.
(e) After the buzzer has stopped, turn the ignition
switch OFF and then start the engine again. With
the driver side or front passenger side seat belt
unfastened, drive the vehicle at 20 km/h (12.4 mph)
or more. Check that the buzzer sounds.
(f) After the buzzer has stopped, fasten the driver side
or front passenger side seat belt, drive the vehicle at
20 km/h (12.4 mph) or more, and then unfasten the
seat belt. Check that the buzzer sounds.
(g) After the buzzer has stopped, move the shift lever to
R. Then move the shift lever to D and with the driver
side or front passenger side seat belt unfastened,
drive the vehicle at 20 km/h (12.4 mph) or more.
Check that the buzzer sounds.
Page 1752 of 2000
SB–14SEAT BELT – SEAT BELT WARNING SYSTEM
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DESCRIPTION
When the ignition switch is ON, the center airbag sensor transmits front seat inner belt status signals to
the combination meter through the CAN bus line. If the driver seat belt is not fastened, the combination
meter blinks the driver side seat belt warning light. If the seat belt is fastened, the warning light goes off.
NOTICE:
The seat belt warning system uses the CAN bus line. Before troubleshooting the seat belt warning
system, perform "COMMUNICATION FUNCTION CHECK" by following "HOW TO PROCEED WITH
TROUBLESHOOTING" to confirm that the communication systems are normal.
Driver Side Seat Belt Warning Light does not Operate