Lexus ES300 (1997 year). Service manual — part 239
BE04V–01
N14824
4
8 7
3 2 1
6 5
LOCK
ACC
ON
START
N21360
4 3 2 1
5
6
7
8
From Back Side
LOCK
ACC
ON
START
BE–20
–
BODY ELECTRICAL
IGNITION SWITCH AND KEY UNLOCK WARNING
SWITCH
1404
1997 LEXUS ES300 (RM511U)
INSPECTION
1.
INSPECT IGNITION SWITCH CONTINUITY
Switch position
Tester connection
Specified condition
LOCK
–
No continuity
ACC
2 – 3
Continuity
ON
2 – 3 – 4
6 – 7
Continuity
START
1 – 2 – 4
6 – 7 – 8
Continuity
If continuity is not as specified, replace the switch.
2.
INSPECT IGNITION SWITCH CIRCUIT
Connect the switch connector and inspect the connector on the
wire harness side from the back side.
Tester connection
Condition
Specified condition
1– Ground
Ignition switch START
Battery positive voltage
2 – Ground
Constant
Battery positive voltage
3 – Ground
Ignition switch ACC or ON
Battery positive voltage
4 – Ground
Ignition switch ON
Battery positive voltage
6 – Ground
Ignition switch ON
Battery positive voltage
7 – Ground
Constant
Battery positive voltage
8– Ground
Ignition switch START
Battery positive voltage
If circuit is not as specified, inspect the switch and circuits con-
nected to other parts.
N20125
OFF
ON
1
2
N21361
From Back Side
1
2
N20129
10
5
1
6
N20130
10 6 5 1
–
BODY ELECTRICAL
IGNITION SWITCH AND KEY UNLOCK WARNING
SWITCH
BE–21
1405
1997 LEXUS ES300 (RM511U)
3.
INSPECT KEY UNLOCK WARNING SWITCH CONTI-
NUITY
Switch position
Tester connection
Specified condition
OFF (Key removed)
–
No continuity
ON (Key set)
1 – 2
Continuity
If continuity is not as specified, replace the switch.
4.
INSPECT KEY UNLOCK WARNING SWITCH CIRCUIT
Connect the switch connector and inspect the connector on the
wire harness side from the back side.
Tester connection
Condition
Specified condition
2– Ground
Ignition key removed
No continuity
2– Ground
Ignition key set
Continuity
1– Ground
Constant
Continuity
If circuit is not as specified, inspect the switch and circuits con-
nected to other parts.
5.
Key Unlock Warning System:
INSPECT INTEGRATION RELAY OPERATION
(a)
Connect the positive (+) lead from the battery to terminal
1.
(b)
Connect the negative (–) lead from the battery to termi-
nals 5, 6 and 10.
(c)
Check the buzzer sounds.
(d)
Disconnect the negative (–) lead from the battery to termi-
nal 6.
(e)
Check that the buzzer stops sounding.
N20131
10 6 5 1
N20135
Junction Block Side
1211
1
2
3
10
9 8 7 6 5 4
BE–22
–
BODY ELECTRICAL
IGNITION SWITCH AND KEY UNLOCK WARNING
SWITCH
1406
1997 LEXUS ES300 (RM511U)
(f)
Connect the negative (–) lead from the battery to terminal
6.
(g)
Disconnect the negative (–) lead from the battery to termi-
nal 5.
(h)
Check that the buzzer stops sounding.
If operation is not as specified, replace the relay.
6.
INSPECT INTEGRATION RELAY CIRCUIT
(a)
Remove the relay from the junction block No.1 and in-
spect the connector on the junction block side.
Tester connection
Condition
Specified condition
2 – Ground
All door courtesy switches OFF (Door closed)
No continuity
2 – Ground
One of the door courtesy switches ON (Door
opened)
Continuity
4 – Ground
Door courtesy switches except that of the driver’s
door OFF (Door closed)
No continuity
4 – Ground
One of the door courtesy switches except that of
the driver’s door ON (Door opened)
Continuity
3 – Ground
Door outside handle switch OFF
No continuity
3 – Ground
Door outside handle switch ON
Continuity
5 – Ground
Key unlock warning switch OFF
No continuity
5 – Ground
Key unlock warning switch ON
Continuity
6 – Ground
Driver’s door courtesy switch OFF (Door closed)
No continuity
6 – Ground
Driver’s door courtesy switch ON (Door opened)
Continuity
8 – Ground
Buckle switch OFF (Seat belt unfastened)
No continuity
8 – Ground
Buckle switch ON (Seat belt fastened)
Continuity
10 – Ground
Constant
Continuity
1 – Ground
Constant
Battery positive voltage
7 – Ground
9 – Ground
Ignition switch LOCK or ACC
No voltage
7 – Ground
9 – Ground
Ignition switch ON
Battery positive voltage
11 – Ground
Ignition switch LOCK
No voltage
11 – Ground
Ignition switch ACC or ON
Battery positive voltage
N20137
Wire Harness Side
Wire Harness Side
Connctor ”A”
Connctor ”B”
1
4
7
10
2 3
5 6
8 9
11
12 13 14 15 16 17 18 19 20 21 22 23 24 25
1
4
2 3
eh–25–1
h–4–1
–
BODY ELECTRICAL
IGNITION SWITCH AND KEY UNLOCK WARNING
SWITCH
BE–23
1407
1997 LEXUS ES300 (RM511U)
(b)
Disconnect the connector from the integration relay and
inspect the connectors on the wire harness side.
Tester connection
Condition
Specified condition
A3 – Ground
Constant
Continuity
A5 – Ground
Driver’s door unlock detection switch OFF (Door
closed)
No continuity
A5 – Ground
Driver’s door unlock detection switch ON (Door
opened)
Continuity
A6 – Ground
Passenger’s door courtesy switch OFF (Door
closed)
No continuity
A6 – Ground
Passenger’s door courtesy switch ON (Door
opened)
Continuity
A7 – Ground
Passenger’s door unlock detection switch OFF
(Door closed)
No continuity
A7 – Ground
Passenger’s door unlock detection switch ON
(Door opened)
Continuity
A9 – Ground
Rear door unlock detection switch OFF (Door
closed)
No continuity
A9 – Ground
Rear door unlock detection switch ON (Door
opened)
Continuity
A11 – A12
A12 – A25
Constant
Continuity
A16 – Ground
Door lock manual switch OFF or UNLOCK
No continuity
A16 – Ground
Door lock manual switch LOCK
Continuity
A17 – Ground
Door lock manual switch OFF or LOCK
No continuity
A17 – Ground
Door lock manual switch UNLOCK
Continuity
A18 – Ground
Driver’s and passenger’s door key lock and
unlock switch OFF or UNLOCK
No continuity
A18 – Ground
Driver’s or passenger’s door key lock and unlock
switch LOCK
Continuity
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