Inspection Procedure C-21: The interior lamp loaded signal is not
detected.
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![](../../../img/54/AC607562AK00ENG.png)
![](../../../img/54/AC607569AF00ENG.png)
![](../../../img/54/AC607567AS00ENG.png)
![](../../../img/54/AC607609AT00ENG.png)
![](../../../img/54/AC607568AC00ENG.png)
![](../../../img/54/AC607610AC00ENG.png)
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caution |
Whenever the ECU is replaced, ensure that the input
signal circuit is normal.
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COMMENTS ON TROUBLE SYMPTOM
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The interior lamp automatic-shutdown function
operates in accordance with the interior lamp loaded signal. If this signal
is abnormal, the functions below will not work normally.
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- Ignition key cylinder illumination lamp
- Room lamps
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- Malfunction of the ETACS-ECU
- Damaged wiring harness or connector(s)
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STEP 1. Check the power supply circuit.
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When the ignition switch is turned to the LOCK
(OFF) position, check if the hazard warning lamps illuminate.
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Q.
Is the check result normal?
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Go to Step 2.
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Refer
to inspection procedure A-1 "Check the ETACS-ECU battery power supply
circuit <Not using SWS monitor>
or <Using SWS
monitor>."
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STEP 2. Connector check: D-419 ETACS-ECU 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.
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STEP 3. Voltage measurement at the D-419 ETACS-ECU
connector.
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(1)Remove the ETACS-ECU, and measure at the junction block
side.
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(2)Turn the ignition switch to the ON position.
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(3)Voltage between D-419 ETACS-ECU connector terminal No.8
and body earth OK: System voltage
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 4.
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STEP 4. Check the wiring harness between D-419 ETACS-ECU connector
terminal No.8 and the ignition switch (IG1).
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note |
Prior to the wiring harness inspection, check
junction block connector D-403, and repair if necessary.
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- Check the power supply line to the ignition switch (IG1) for open
circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 5. Voltage measurement at the D-419 ETACS-ECU
connector.
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(1)Remove the ETACS-ECU, and measure at the junction block
side.
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(2)Turn the ignition switch to the ACC position.
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(3)Voltage between terminal 4 and body earth OK:
System voltage
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 6.
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STEP 6. Check the wiring harness between D-419 ETACS-ECU connector
terminal No.4 and the ignition switch (ACC).
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note |
Prior to the wiring harness inspection, check
junction block connector D-401 and intermediate connectors D-238 and
D-241, and repair if necessary.
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- Check the power supply line to the ignition switch (ACC) for open
circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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Repair
the wiring harness.
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STEP 7. Retest the system.
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Check that the interior lamp loaded signal is
received normally.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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Replace the ETACS-ECU.
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