Lexus SC300 / Lexus SC400. Service manual — part 279
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WIRING DIAGRAM
ABS Warning Light Circuit
CIRCUIT DESCRIPTION
If the ECU detects trouble, it lights the ABS warning light while at the same time prohibiting ABS control.
At this time, the ECU records a diagnostic trouble code in memory.After removing the short pin of the DLC1,
connect a DLC1 or connect terminals Tc and E1 of the DLC2 to make the ABS warning light to blink and
output the diagnostic trouble code.DIAGNOSTIC CHARTPerform troubleshooting in accordance with the
chart below for each trouble symptom.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
Perform troubleshooting in accordance with the chart below for each trouble symptom.
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ABS warning light does not light up
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
Go to step
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ABS warning light remains on
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
Go to step
BR–144
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
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–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
BR–145
![](/vehicle/tus/kendre/chaul/inoh.png)
OK
NG
OK
NG
INSPECTION PROCEDURE
1
Check ABS warning light.
See Combination Meter Troubleshooting on page
Replace bulb or combination meter assembly.
2
Check ABS solenoid relay.
C
OK
P
OK
C
Remove solenoid relay from R/B No. 6.
Check continuity between each terminal of ABS sole-
noid relay shown below.
1.
Apply battery voltage between terminals 4 and 6.
2.
Check continuity between each terminal of ABS so-
lenoid relay shown below.
Replace ABS solenoid relay.
Repair or replace and check for open in harness and connector between check connector and ABS
solenoid relay and body ground (See page
).
BR–146
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
![](/vehicle/tus/kendre/chaul/moheroks.png)
NO
YES
YES
NO
OK
NG
INSPECTION PROCEDURE
3
Is diagnosis trouble code output?
Perform diagnostic trouble code check on page
Repair circuit indicated by the code output.
4
Does ABS warning light go off if short pin is removed?
Check for short in harness and connector between warn-
ing light and data link connector 1 and ECU (See page
5
Check ABS solenoid relay (See step
).
Replace ABS solenoid relay.
Repair or replace and check for short in harness
and connector between data link connector 1 and
ABS solenoid relay (See page
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
BR–147
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