Inspection Procedure
1: The accessory socket does not work.
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Before replacing the ECU, ensure that the power supply
circuit, the earth circuit and the communication circuit are normal.
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OPERATION
When the ignition switch is in the ON or ACC position, the accessory socket can be used.
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| note |
The maximum load of accessory socket is 120 W.
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COMMENTS ON TROUBLE SYMPTOM
If the accessory socket cannot be used even when the ignition switch is in the ON or ACC
position, ETACS-ECU, accessory socket itself, or accessory socket power supply circuit may have
a problem.
PROBABLE CAUSES
- Malfunctions of accessory socket (quarter trim)
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III other system diagnosis code
Check if the diagnosis code is set in the ETACS-ECU.
Q.
Is the check result normal?
Troubleshoot the ETACS-ECU. Refer to ETACS-ECU - Troubleshooting.
Go to Step 2.
STEP 2. M.U.T.-III other system data list
Check the input signal of ACC relay. (ETACS-ECU)
- Turn the ignition switch to the ACC position.
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Item No.
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Item name
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Normal condition
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Item 288
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ACC switch
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ON
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OK: Normal condition is displayed.
Q.
Is the check result normal?
Go to Step 3.
Refer to ETACS - Input Signal Procedure 1 "The ignition switch (ACC)
signal is not received".
STEP 3. Voltage measurement at accessory socket (quarter trim) connector
ASK1 terminal.
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(1)Disconnect the connector, and measure at the wiring harness-side connector.
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(2)Turn the ignition switch to the "ACC" or "ON" position.
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(3)Check the voltage between the accessory socket (quarter trim) connector ASK1 terminal
and body earth.
OK: System voltage
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Q.
Is the check result normal?
YES 
: Go to Step 5.
Go to Step 4.
STEP 4. Check of short to power supply, short to earth, and open circuit
in ASK1 line between accessory socket (quarter trim) and ETACS-ECU connector.
Q.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
STEP 5. Resistance measurement at accessory socket (quarter trim)
connector (earth terminal).
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(1)Disconnect the connector, and measure the resistance available at the wiring harness
side of the connector.
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(2)Measure the resistance between the accessory socket (quarter trim) connector (earth
terminal) and body earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Check of open circuit in earth line between accessory socket
(quarter trim) connector and body earth.
Q.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
STEP 7. Retest the system
Check if the accessory socket (quarter trim) power is turned ON.
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction).
Replace the accessory socket (quarter trim).