Inspection Procedure C-3: The "R" position 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 back-up lamp switch
<M/T> or inhibitor switch <A/T> is used
to operate the rear wiper. If the signal is abnormal, the rear wiper will
not work normally.
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- Malfunction of the back-up lamp switch
<M/T>
- Malfunction of the inhibitor switch <A/T>
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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STEP 1. Connector check: D-421 ETACS-ECU connector, C-17 back-up lamp
switch connector <M/T> and C-05 inhibitor switch
connector <A/T>
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Q.
Is the check result normal?
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YES <Vehicles for M/T> : Go to Step
2.
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YES <Vehicles for A/T> : Go to Step
7.
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NO <The connectors are not in good
condition.> : Repair the defective connector.
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STEP 2. Check the back-up lamp switch
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Check the back-up lamp switch (Refer to GROUP
22B - Transmission  ).
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Q.
Is the check result normal?
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 Go to Step 3.
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 Replace the back-up lamp
switch.
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STEP 3. Voltage measurement at the D-421 ETACS-ECU
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(3)Shift position: R position
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(4)Voltage between D-421 ETACS-ECU connector terminal No.39
and body earth
OK: System voltage
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Q.
Is the check result normal?
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Replace the ETACS-ECU.
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Go to Step 4.
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STEP 4. Voltage measurement at the C-17 back-up lamp switch
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(3)Voltage between C-17 back-up lamp switch connector
terminal No.2 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 6.
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STEP 5. Check the wiring harness between C-17 back-up lamp switch
connector terminal No.1 and D-421 ETACS-ECU connector terminal
No.39.
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| note |
Prior to the wiring harness inspection, check
intermediate connectors D-225 and D-230, and repair if
necessary.
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- Check the input line for open circuit.
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Q.
Is the check result normal?
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Go to Step 12.
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Repair
the wiring harness.
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STEP 6. Check the wiring harness between C-17 back-up lamp switch
connector terminal No.2 and the ignition switch (IG1).
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| note |
Prior to the wiring harness inspection, check
intermediate connectors D-225, D-229, junction block connectors D-401
and 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 use troubleshooting/Inspection Service Points ).
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Repair
the wiring harness.
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STEP 7. Check the inhibitor switch
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Check the inhibitor switch (Refer to GROUP 23A
- On-vehicle Service ).
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Q.
Is the check result normal?
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Go to Step 8.
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Replace the inhibitor switch.
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STEP 8. Voltage measurement at the D-421 ETACS-ECU
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(3)Shift position: R position
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(4)Voltage between D-421 ETACS-ECU connector terminal No.39
and body earth
OK: System voltage
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Q.
Is the check result normal?
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Replace the ETACS-ECU.
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Go to Step 9.
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STEP 9. Voltage measurement at the C-05 inhibitor switch
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(3)Voltage between C-05 inhibitor switch connector terminal
No.7 and body earth
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 11.
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STEP 10. Check the wiring harness between C-05 inhibitor switch
connector terminal No.8 and D-421 ETACS-ECU connector terminal
No.39.
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| note |
Prior to the wiring harness inspection, check
intermediate connectors D-225 and D-230, and repair if
necessary.
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- Check the input line for open circuit.
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Q.
Is the check result normal?
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Go to Step 12.
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Repair
the wiring harness.
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STEP 11. Check the wiring harness between C-05 inhibitor switch
connector terminal No.7 and the ignition switch (IG1).
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| note |
Prior to the wiring harness inspection, check
intermediate connectors D-225, D-229, junction block connectors D-401
and 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 use troubleshooting/Inspection Service Points ).
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Repair
the wiring harness.
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STEP 12. Retest the system.
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Check that the back-up lamp switch
<M/T> or inhibitor switch <A/T> 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 use troubleshooting/Inspection Service Points ).
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Replace the ETACS-ECU.
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