Inspection Procedure
3: Your voice is not transferred during a call.
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When replacing the ECU, always
check that the communication circuit is normal.
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COMMENTS ON TROUBLE SYMPTOM
If your voice is played through the microphone, its circuit may be shorted, or the microphone
or the e-Call control unit may fail.
PROBABLE CAUSES
- Damaged wiring harness or connector(s)
- Malfunction of microphone
- Malfunction of e-Call relay box
- Malfunction of e-Call control unit
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III special function.
Check the microphone (Refer to 
).
Test
- Item No.5: Microphone check (Door speaker)
OK: Your voice is played (during the test).
Q.
Is the check result normal?
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction).
NO 
: Go to Step 2.
STEP 2. Check the hands free system
Q.
Is the hands-free system installed?
Go to Step 3.
Go to Step 4.
STEP 3. Check the handsfree talking.
Q.
Is the check result normal?
Replace the e-Call control unit (Refer to ).
Troubleshooting the hands free-ECU (Refer to ).
STEP 4. Resistance measurement at the microphone connector (MIC terminal)
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(1)Disconnect the microphone connector, and measure at the wiring harness side.
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(2)Check the resistance between the microphone connector terminal MIC and body earth.
OK: No continuity
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Q.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
STEP 5. Voltage measurement at the e-Call control unit connector (MI+ terminal)
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(1)Disconnect the e-Call control unit connector, and measure at the wiring harness
side.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check the voltage between the microphone connector terminal MI+ and body
earth.
OK: 0 V
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Q.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.
STEP 6. Resistance measurement at between e-Call control unit and
microphone connector (MI+ or MIC terminals)
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(1)Disconnect the e-Call control unit and microphone connector, and measure at the
wiring harness side.
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(2)Check the resistance between the e-Call control unit connector terminal MI+ and
microphone connector terminal MIC.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
Replace the microphone (Refer to ). Then
go to Step 7.
Repair the connector(s) or wiring harness.
STEP 7. Retest the system
Q.
Is the check result normal?
The procedure is complete.
Replace the e-Call control unit (Refer to ).