Inspection Procedure 2: No Sound is Heard. <Vehicles with audio
amplifier>
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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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COMMENTS ON TROUBLE SYMPTOM
If the audio sound is not output, the
radio and CD player or CD changer, audio amplifier, or power supply circuit of
audio amplifier may have a problem, or the option coding information may be
inconsistent.
PROBABLE CAUSES
- Malfunctions of radio and CD player or CD changer
- Malfunction of audio amplifier
- Option coding information inconsistency
- Damaged harness wires and connectors
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STEP 1. Connector check: E-37 audio amplifier connector
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair
the defective connector.
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STEP 2. Resistance measurement at E-37 audio amplifier
connector
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Check the continuity between E-37 audio amplifier
connector terminal No.24 and the body earth.
OK: Continuity
exists (2 Ω or less)
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(3)Check the continuity between E-37 audio amplifier
connector terminal No.31 and the body earth.
OK: Continuity
exists (2 Ω or less)
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(4)Check the continuity between E-37 audio amplifier
connector terminal No.32 and the body earth.
OK: Continuity
exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 3.
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STEP 3. Check the harness wire between E-37 audio amplifier connector
terminal No.24, 31, 32 and the body earth
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- Check the earth wires for open circuit.
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Q.
Is the check result normal?
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Go to Step 10.
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Repair
the wiring harness.
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STEP 4. Voltage measurement at E-37 audio amplifier
connector
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(1)Disconnect the connector, and measure at the wiring
harness-side connector.
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(2)Measure the voltage between E-37 audio amplifier connector
terminal No.25 and the body earth
OK: Battery
voltage
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(3)Measure the voltage between E-37 audio amplifier connector
terminal No.35 and the body earth
OK: Battery
voltage
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(4)Measure the voltage between E-37 audio amplifier connector
terminal No.36 and the body earth
OK: Battery
voltage
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 5.
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STEP 5. Check the harness wire between E-37 audio amplifier connector
terminal No.25, 35, 36 and fusible link (29).
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- Check the power supply line for open circuit and short
circuit.
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Prior to the wiring harness inspection, check
intermediate connectors D-236 and D-238, and repair if
necessary.
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Q.
Is the check result normal?
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Go to Step 10.
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Repair
the wiring harness.
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STEP 6. Connector check: D-211 radio and CD player or CD changer
connector
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Q.
Is the check result normal?
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Go to Step 7.
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Repair
the defective connector.
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STEP 7. Check the harness wire between D-211 radio and CD player or CD
changer connector terminal No.7, 16 and E-37 audio amplifier connector
No.34, 33
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- Check the communication lines for open circuit.
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Q.
Is the check result normal?
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Go to Step 8.
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Repair
the wiring harness.
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STEP 8. Connector check: E-38 audio amplifier connector
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Q.
Is the check result normal?
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Go to Step 9.
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Repair
the defective connector.
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STEP 9. Check the harness wire between D-211 radio and CD player or CD
changer connector terminal No.17 and E-38 audio amplifier connector
No.3
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- Check the communication lines for open circuit.
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Q.
Is the check result normal?
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Go to Step 10.
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Repair
the wiring harness.
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STEP 10. Retest the system
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Replace the audio amplifier, then check that
the audio sound is output.
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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 - How to Cope
with Intermittent Malfunction  ).
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Replace the radio and CD player or CD
changer.
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