DTC B1775

DTC B1775  : Microphone Input/Output Open or Shorted to Power

DTCs (Telematics System)

NOTE:  Check the connectors for poor connections or loose terminals.

1. Problem verification

   -1. Clear the DTCs with the HDS.

   -2. Turn the vehicle to the OFF (LOCK) mode.

   -3. Open the driver's door, and wait more than 1 minute.

   -4. Turn the vehicle to the ON mode.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   B1775 Microphone Input/Output open or shorted to power

   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 SIG line to power)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Open the driver's door, and wait more than 1 minute.

   -3. Disconnect the following connectors.

   Telematics control unit connector A (32P)

   Front HFL-ANC/active sound control microphone 8P connector

   -4. Turn the vehicle to the ON mode.

   -5. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Telematics control unit connector A (32P): disconnected
   	Front HFL-ANC/active sound control microphone 8P connector: disconnected
   Test point 1	Front HFL-ANC/active sound control microphone 8P connector No. 2
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   There is a short to power in the wire. Replace the affected shielded harness.

   NO 

   The MIC SIG wire is not shorted to power. Go to step 3.

3. Determine possible failure area (MIC SIG line, others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Open the driver's door, and wait more than 1 minute.

   -3. Reconnect telematics control unit connector A (32P).

   -4. Turn the vehicle to the ON mode.

   -5. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Front HFL-ANC/active sound control microphone 8P connector: disconnected
   Test point 1	Front HFL-ANC/active sound control microphone 8P connector No. 2
   Test point 2	Body ground

   Is there about 8.0 V?

   YES 

   The MIC SIG wire is OK. Go to step  5.

   NO 

   Go to step 4.

4. Open wire check (MIC SIG line)

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Front HFL-ANC/active sound control microphone 8P connector: disconnected
   Test point 1	Telematics control unit connector A (32P) No. 9
   Test point 2	Body ground

   Is there about 8.0 V?

   YES 

   There is an open in the wire. Replace the affected shielded harness.

   NO 

   Replace the telematics control unit .

5. Open wire check (MIC GND line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Open the driver's door, and wait more than 1 minute.

   -3. Reconnect the front HFL-ANC/active sound control microphone 8P connector.

   -4. Turn the vehicle to the ON mode.

   -5. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   Test point 1	Front HFL-ANC/active sound control microphone 8P connector No. 2
   Test point 2	Body ground

   Is there less than 0.2 V?

   YES 

   Replace the front HFL-ANC/active sound control microphone .

   NO 

   Repair an open or high resistance in the wire. If the wire is OK, replace the telematics control unit .