Lexus SC300 / Lexus SC400. Manual — part 739
OK
NG
NG
OK
INSPECTION PROCEDURE
1
Check shift position indicator.
Check that “P” lights up on the shift indicator when P position is shifted into, and that “P” is extin-
guished when shifting into another position.
P
Check and repair shift position indicator circuit (See
page
2
Check voltage between terminal P of ECU connector and body ground.
C
OK
P
Remove ECU with connectors still connected.
1.
Turn ignition switch on.
2.
Measure voltage between terminal P of ECU con-
nector and body ground when the shift lever is oper-
ated.
Proceed to next circuit inspection shown on matrix chart
(See page
Check for open in harness and connectors be-
tween ECU and [IK1] connector.
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STEERING
STEERING COLUMN
SR–95
WIRING DIAGRAM
CIRCUIT INSPECTION
Parking Brake Switch Circuit
CIRCUIT DESCRIPTION
When the parking brake is operating, the parking brake switch sends a signal to the ECU. When this signal
is input to the ECU during tilt & telescopic, the ECU cancels tilt & telescopic.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
SR–96
–
STEERING
STEERING COLUMN
OK
NG
NG
OK
NG
OK
OK
NG
INSPECTION PROCEDURE
1
Check operation of brake warning light.
Check that the brake warning light in the instrument panel comes on when the parking brake is opera-
tion with the engine running, and the light goes off when the parking brake is not operating.
C
Check brake warning light circuit.
2
Input signal check.
C
OK
1.
See input signal check.
2.
Check the indicator light when the parking brake is
operating.
The indicator light goes off when the parking brake
is operating.
Proceed to next circuit inspection shown on matrix
chart.
3
Check voltage between terminal PKB of tilt & telescopic ECU connector and body ground.
C
OK
P
Remove tilt & telescopic ECU with connectors still con-
nected.
1.
Turn ignition switch ON.
2.
Measure voltage between terminal PKB of tilt &
telescopic ECU connector and body ground, when
the parking brake lever is operating.
Proceed to next circuit inspection shown on matrix
chart.
4
Check for open in harness and connector between tilt & telescopic ECU and brake warning light
(See page
).
.
Repair or replace harness or connector
Check and replace tilt & telescopic ECU.
–
STEERING
STEERING COLUMN
SR–97
).
WIRING DIAGRAM
Door Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The ECU determines the position of the driver’s door by monitoring the voltage at terminal DSW.
ÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑ
Door Position
ÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑ
Switch Position
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
DSW Voltage
ÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑ
Opened
ÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑ
Closed
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
Below 1 V
ÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑ
Closed
ÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑ
Opened
ÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑ
10–14 V
DIAGNOSTIC CHART
DIAGNOSTIC CHART
SR–98
–
STEERING
STEERING COLUMN
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