Page 4825 of 5883

SRC-56
< COMPONENT DIAGNOSIS >
SEAT BELT WARNING LAMP CONTROL UNIT
3. Check voltage between seat belt warning lamp control unit har-
ness connector B51 terminals 21, 22 and ground.
Are inspection results normal?
YES >> GO TO 2.
NO >> Replace seat belt warning lamp control unit.
2.CHECK HARNESS BETWEEN SEAT BELT WARNING LAMP CONTROL UNIT AND SEAT BELT BUCKLE
SWITCH
1. Turn ignition switch OFF.
2. Disconnect the seat belt warning lamp control unit harness connector and the seat belt buckle switch har-
ness connector.
3. Check continuity between seat belt warning lamp control unit
harness connector B51 (A) terminals 21, 22 and seat belt buckle
switch harness connector B9, B10 (B) terminal 1.
Also check harness for short to ground and short to power.
Are inspection results normal?
YES >> GO TO 3.
NO >> Repair or replace damaged parts.
3.CHECK SEAT BELT BUCKLE SWITCH GROUND CIRCUIT
Check continuity between seat belt buckle switch harness connector
B9, B10 terminal 2 and ground.
Is inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit in harness or connectors.
4.CHECK SEAT BELT BUCKLE SWITCH
Fasten and unfasten the seat belt buckle switch and check continuity
between seat belt buckle switch terminals 1 and 2.
Are inspection results normal?
YES >> GO TO 5.
NO >> Replace seat belt buckle switch. Refer to SE-14,
"Removal and Installation".
5.CHECK SEAT BELT WARNING LAMP CONTROL UNIT
Check seat belt warning lamp control unit input/output signals. Refer to SRC-58, "
Reference Value".
Are inspection results normal?
YES >> Inspection End.
Connector Terminals Voltage
B51 21 - Ground
Battery voltage
22 - Ground
AWHIA0023ZZ
Continuity should exist.
AWHIA0024ZZ
Continuity should exist.
AWHIA0025ZZ
Terminal Condition Continuity
1 - 2Fastened No
Unfastened Yes
AWHIA0026ZZ
Page 4826 of 5883
SEAT BELT WARNING LAMP CONTROL UNIT
SRC-57
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NO >> Check seat belt warning lamp control unit pin terminals for damage or loose connections. If any
items are damaged, repair or replace damaged parts. If not damaged, replace seat belt warning
lamp control unit.
Page 4827 of 5883
SRC-58
< ECU DIAGNOSIS >
DIAGNOSIS SENSOR UNIT
ECU DIAGNOSIS
DIAGNOSIS SENSOR UNIT
Reference ValueINFOID:0000000001726678
SEAT BELT WARNING LAMP CONTROL UNIT HARNESS TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUES FOR SEAT BELT WARNING LAMP CONTROL UNIT
AWHIA0027ZZ
Te r m i n a l
(color)ItemCondition
Reference value (V)
(Approx.) Ignition
switchOperation
1 (V) Battery power — — Battery voltage
8 (O)Driver seat belt warn-
ing lamp outputON — 0
15 (BR)Passenger seat belt
warning lamp outputON — 0
16 (BR) Ground — — —
17 (O) Ignition power ON — Battery voltage
21 (O)Driver seat belt buck-
le switch inputON Driver seat belt fastened 12
22 (LG)Passenger seat belt
buckle switch inputON Passenger seat belt fastened 12
36 (V)Vehicle speed signal
(2-pulse)ONSpeedometer operated
[When vehicle speed is approx. 40 km/h (25
MPH)] NOTE:
Maximum voltage may be 5V due to
specifications (connected units).
PKIC0642E
Page 4828 of 5883
DIAGNOSIS SENSOR UNIT
SRC-59
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Wiring Diagram — RHD Models —INFOID:0000000001396410
ALHWA0008GB
Page 4829 of 5883
SRC-60
< ECU DIAGNOSIS >
DIAGNOSIS SENSOR UNIT
ALHWA0009GB
Page 4830 of 5883
DIAGNOSIS SENSOR UNIT
SRC-61
< ECU DIAGNOSIS >
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ALHIA0082GB
Page 4831 of 5883
SRC-62
< ECU DIAGNOSIS >
DIAGNOSIS SENSOR UNIT
ALHIA0083GB
Page 4832 of 5883
DIAGNOSIS SENSOR UNIT
SRC-63
< ECU DIAGNOSIS >
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ALHIA0084GB