INSPECTION PROCEDURE
P-7: The column switch (windshield wiper washer and rear wiper washer switch)
signal is not
received.
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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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Input signal from the column switch (wiper
switch) is used to operate the functions below.
If the signal is abnormal, these functions will not work normally.
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- Windshield wiper and washer
- Rear wiper and washer
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- Malfunction of the column switch
- Damaged harness wires and connectors
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Step 1. Check the vehicle model for which no column switch
(windshield wiper washer and rear wiper washer switch) signal is received.
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Q.
Which vehicle model does not send any column switch (windshield wiper
washer and rear
wiper washer switch) signal, LHD or RHD?
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<LH drive vehicles> : Go to Step
2.
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<RH drive vehicles> : Go to Step
4.
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Step 2. Use the M.U.T.-III to confirm a diagnosis code.
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Check that the ETACS-ECU sets a diagnosis
code.
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Q.
Is the diagnosis code set?
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 Refer
to diagnosis code chart  .
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 Go to Step 3.
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Step 3. Retest the system.
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Replace the column switch, and check if the
column switch (windshield wiper washer and
rear wiper washer switch) sends signal.
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(1)Replace the column switch.
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(2)Check if the column switch (windshield wiper/washer
and rear wiper washer
switch) sends signal.
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Q.
Is the check result normal?
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The
procedure is complete.
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Replace the ETACS-ECU.
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Step 4. Check the column switch connector.
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Check that the wiper and washer switch
connector, the lighting switch connector and the
switch body connector are in good condition.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair
the defective connector.
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Step 5. Check the column switch (wiper switch and switch
body).
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Refer to GROUP 54A - Column switch .
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Q.
Is the check result normal?
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Go to Step 6.
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Replace the column switch.
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Step 6. M.U.T.-III diagnosis code
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Check that the ETACS-ECU sets a diagnosis
code.
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Q.
Is the diagnosis code set?
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Refer
to diagnosis code chart .
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Go to Step 7.
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Step 7. Retest the system.
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Replace the column switch, and check if the
column switch (windshield wiper/washer
and rear wiper washer switch) sends signal.
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(1)Replace the column switch.
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(2)Check if the column switch (windshield wiper/washer
and rear wiper washer
switch) sends signal.
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Q.
Is the check result normal?
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The
procedure is complete.
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Replace the ETACS-ECU.
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