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Diagnosis Procedure
1.CHECK MICROPHONE SIGNAL CIRCUIT AND MICROPHONE POWER SUPPLY CIRCUIT CONTINUITY
  1. Turn ignition switch OFF.
  2. Disconnect TCU connector and microphone connector.
  3. Check continuity between TCU connector and microphone connector.
    TCUMicrophoneContinuity
    ConnectorTerminalConnectorTerminal
    M3517R88Existed
    183
  4. Check the continuity between TCU connector and ground.
    TCUGroundContinuity
    ConnectorTerminal
    M3518Not existed
    17
Is the inspection result normal?
.
Repair or replace harness or connectors.
 
2.CHECK MICROPHONE POWER SUPPLY VOLTAGE
  1. Connect TCU connector and microphone connector.
  2. Turn ignition switch ON.
  3. Check voltage between TCU connector and ground.
    (+)(−)Voltage
    (Approx.)
    TCU
    ConnectorTerminal
    M3518Ground5.0 V
Is the inspection result normal?
.
Replace TCU. Refer to Removal & Installation.
 
3.CHECK MICROPHONE SIGNAL
Check signal between TCU connector and ground.
(+)(−)ConditionReference value
TCU
ConnectorTerminal
M3517GroundSpeak into microphone.
Is the inspection result normal?
Replace TCU.Refer to Removal & Installation.
Replace microphone.Refer to Removal and Installation.