Lexus SC300 / Lexus SC400. Service manual — part 262

DIAGNOSIS SYSTEM

INDICATOR CHECK

When the ignition switch is turned on, check that the ABS
warning light goes on for 3 seconds.
HINT: If the indicator check result is not normal, proceed to
trouble shooting for the ABS warning light circuit (see page

BR–144

DIAGNOSTIC TROUBLE CODE CHECK
1.

Turn the ignition switch to ON.

Disconnect the Short Pin from DLC1.

Using SST, connect terminals Tc and E1 of DLC2 or DLC1.
SST 09843–18020

Read the diagnostic trouble code from the ABS warning light
on the combination meter.
HINT: If no code appears, inspect the diagnostic circuit or
ABS warning light circuit (See page

BR–148

BR–144

As an example, the blinking patterns for normal code and
codes 11 and 21 are shown on the left.

Codes are explained in the code table on page

BR–78

After completing the check, disconnect terminals Tc and E1,
and turn off the display.
If 2 or more malfunctions are indicated at the same time, the
lowest numbered diagnostic trouble code will be displayed
first.

BR–76

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BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

ECU DATA MONITOR USING LEXUS HAND–HELD TESTER
1.

Hook up the LEXUS hand–held tester to the DLC2.

Monitor the ECU data by following the prompts on the tester
screen.
HINT: LEXUS hand–held tester has a “Snapshot” function
which records the monitored data.
Please refer to the LEXUS hand–held tester operator’s
manual for further details.

DIAGNOSTIC TROUBLE CODE CLEARANCE
1.

Using SST, connect terminals Tc and E1 of DLC2 or DLC1.
SST 09843–18020

IG switch ON.

3. Clear the diagnostic trouble codes stored in ECU by

depressing the brake pedal 8 or more times within 3 seconds.

Check that the warning light shows the normal code.

Remove the SST from the terminals of DLC2 or DLC1.

Connect the Short Pin to DLC1.
HINT: Cancellation can also be done by removing the DOME
fuse, but in this case, other memory systems will also be can-
celled out.

ECU TERMINAL VALUES MEASUREMENT USING LEXUS

BREAK–OUT–BOX AND LEXUS HANDHELD TESTER

1. Hook up the LEXUS hand–held tester and LEXUS

break–out–box to the vehicle.

2. Read the ECU input/output values by following the

prompts on the scan tool screen.
HINT: LEXUS hand–held tester has a “Snapshot” function.
This records the measured values and is effective in the diag-
nosis of intermittent problems.
Please refer to the LEXUS hand–held tester/LEXUS break–
out–box operator’s manual for further details.

–

BRAKE SYSTEM

ANTI–LOCK BRAKE SYSTEM (ABS)

BR–77

DIAGNOSTIC TROUBLE CODE CHART

If a malfunction code is displayed during the diagnostic trouble code check, check the circuit listed for that
code, in the table below and proceed to the relevant page.
HINT: Using SST 09843–18020, connect the terminals Tc and E1, and remove the short pin.