Symptom:
GENERAL MICROPHONE FAULT
POSSIBLE CAUSES
AUTOMATIC DAY/NIGHT MIRROR
HANDS FREE MODULE
MICROPHONE CIRCUITS OPEN
MICROPHONE CIRCUITS SHORT TO GROUND
MICROPHONE CIRCUITS SHORT TO VOLTAGE
MICROPHONE CIRCUITS SHORTED TOGETHER
INTERMITTENT CONDITION
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, erase DTCs.
Attempt to make a phone call using the system.
With the DRBIIIt, read DTCs.
Does the DRBIIIt display this DTC?
All
Yes → Go To 2
No → Go To 7
2 Turn the ignition off.
Disconnect the Automatic Day/Night Mirror harness connectors.
Disconnect the Hands Free Module harness connectors.
Measure the resistance of each Microphone circuit between the HFM connector and
the Automatic Day/Night Mirror connector.
Is the resistance below 10.0 ohms for each measurement?
All
Yes → Go To 3
No → Repair the Microphone circuits for an open.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off.
Disconnect the Automatic Day/Night Mirror harness connectors.
Disconnect the Hands Free Module harness connectors.
Measure the resistance between ground and each Microphone circuit.
Is the resistance above 1000.0 ohms for each measurement?
All
Yes → Go To 4
No → Repair the Microphone circuits for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
499
TELECOMMUNICATION
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