Inspection Procedure 3: When the ignition switch is turned to the "ON"
position (engine stopped), the ASTC indicator lamp does not
illuminate.
OPERATION
- The active stability control OFF indicator lamp is lit up by transistor
control in the ASTC-ECU. However, the relationship of the reverse circuit
movement in the combination meter will vary from usual in terms of
transistor ON/OFF and active stability control OFF indicator lamp
ON/OFF, in that the active stability control OFF indicator lamp will
lamp up when the transistor is turned OFF for this circuit. This is how the
active stability control OFF indicator lamp lights up even when the ASTC-ECU
connector is connected improperly or if the ASTC-ECU function has
terminated.
- The ASTC-ECU also lights up the active stability control OFF indicator
lamp during the initial check (approximately 3 seconds) when the ignition
switch is turned to the "ON" position in addition to when the system is
malfunctioning.
COMMENT ON TROUBLE SYMPTOM
Possible causes include the combination
meter power circuit, disconnected earth circuit, dead lamp bulb, or short
circuited active stability control OFF indicator lamp.
PROBABLE CAUSES
The most likely causes for this case
are:
- Blown fuse
- Damaged wiring harness or connector
- Burnt out active stability control OFF indicator lamp bulb
- Combination meter defect
- Malfunction of the ASTC-ECU
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STEP 1. Voltage measurement at combination meter connector
D-04.
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(1)Do not disconnect combination meter connector D-04, and
check at the harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between terminal 10 and
earth.
OK: System voltage
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Q.
Is the check result normal?
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 Go to Step 2.
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 Replace the combination meter.
Then go to Step 5.
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STEP 2. Connector check: D-04 combination meter connector, D-223
ASTC-ECU connector and D-230 intermediate connector.
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the defective connector.
Then go to Step 5.
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STEP 3. Check the harness wire between the combination meter connector
D-04 terminal 10 and ASTC-ECU connector D-223 terminal 82.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the harness wire. Then go
to Step 5.
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STEP 4. Retest the system.
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Q.
Does the active stability control OFF indicator lamp illuminate for 3
seconds when the ignition switch is turned to the "ON" position with
engine stopped or upon start-up?
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It can
be assumed that this malfunction is intermittent. Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service Points - How to Cope
with Intermittent Malfunction  .
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Repair the ASTC-ECU. Then go to
Step 5.
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STEP 5. Retest the system.
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Q.
Does the active stability control OFF indicator lamp illuminate for 3
seconds when the ignition switch is turned to the "ON" position with
engine stopped or upon start-up?
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The
procedure is complete.
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Start over at Step 1.
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