DTC B1775: Microphone Input/Output Shorted to Power or Open
NOTE:
- Check the vehicle 12 volt battery condition first .
- Before you troubleshoot, make sure to follow the General Troubleshooting Information .
- Check the connectors for poor connections or loose terminals.
- 1. Problem verification:
1. Check for HFL DTCs .
Is DTC B1775 indicated?
YES
The failure is duplicated, go to step 2.
NO
Intermittent failure, the system is OK at this time.
- 2. Shorted wire check (MIC+ line to power):
1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connectors.
HandsFreeLink control unit 32P connector HFL microphone 10P connector 3. Turn the vehicle to the ON mode.
4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode HandsFreeLink control unit 32P connector: disconnected HFL microphone 10P connector: disconnected Test point 1 HandsFreeLink control unit 32P connector No. 2 Test point 2 Body ground Is there any voltage?
YES
There is a short to power in the wire between the HandsFreeLink control unit and the HFL microphone. Replace the affected shielded harness.
NO
The MIC+ wire is not shorted to power. Go to step 3.
- 3. Open wire check (MIC+ line, MIC- line):
1. Turn the vehicle to the OFF (LOCK) mode.
2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode HandsFreeLink control unit 32P connector: disconnected HFL microphone 10P connector: disconnected Test point 1 HandsFreeLink control unit 32P connector No. 2 Test point 2 HFL microphone 10P connector No. 5 Test point 1 HandsFreeLink control unit 32P connector No. 1 Test point 2 HFL microphone 10P connector No. 4 Is there continuity?
YES
The MIC+ and the MIC- wires are OK. Go to step 4.
NO
There is an open in the wire(s) between the HandsFreeLink control unit and the HFL microphone. Replace the affected shielded harness.
- 4. HFL microphone check (substitution):
1. Substitute a known-good HFL microphone .
2. Reconnect all the connectors.
3. Check for HFL DTCs .
Is DTC B1775 indicated?
YES
Replace the HandsFreeLink control unit .
NO