Pinpoint Test J: DTC B2633 Driver - Front Microphone Circuit Failure

Test Step 

J1 CHECK THE VOICE SIGNAL INPUT 

• Key in OFF position.
• Disconnect: Navigation System Module C4209.
• Key in ON position.
• Measure the voltage between the navigation system module C4209 pin 7, circuit 1196 (DG/WH), harness side and between the navigation system module C4209 pin 19, circuit 1197 (LG/BU), harness side while speaking loudly into the rear view mirror microphone.
  Fig 1: Checking Voice Signal Input

  Courtesy of FORD MOTOR CO.
• Is any AC voltage indicated? 

Result / Action to Take 

Yes 

GO to J6.

No 

GO to J2.

Test Step 

J2 CHECK CIRCUIT 1002 (BK/PK) FOR VOLTAGE 

• Key in OFF position.
• Disconnect: Rear View Mirror C911.
• Key in ON position.
• Measure the voltage between the rear view mirror C911 pin 13, circuit 1002 (BK/PK), harness side and ground.
  Fig 2: Checking Circuit 1002 (BK/PK) For Voltage

  Courtesy of FORD MOTOR CO.
• Is the voltage greater than 10 volts? 

Result / Action to Take 

Yes 

GO to J3.

No 

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

Test Step 

J3 CHECK CIRCUIT 1203 (BK/LB) FOR AN OPEN 

• Key in OFF position.
• Measure the resistance between the rear view mirror C911 pin 2, circuit 1203 (BK/LB), harness side and ground.
  Fig 3: Checking Circuit 1203 (BK/LB) For Open

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms? 

Result / Action to Take 

Yes 

GO to J4.

No 

REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

Test Step 

J4 CHECK CIRCUITS 1196 (DG/WH) AND 1197 (LG/BU) FOR AN OPEN AND A SHORT TO GROUND 

• Measure the resistances between the navigation system module C4209 pins harness side and the rear view mirror C911 pins harness side; and between the navigation system module C4209 pins harness side and ground as follows:

  Navigation System Module Pin	Rear View Mirror Pin	Circuit
  C4209 pin 7	C911 pin 9	1196 (DG/WH)
  C4209 pin 19	C911 pin 10	1197 (LG/BU)

  Fig 4: Checking Circuits 1196 (DG/WH) And 1197 (LG/BU) For Open And Short To Ground

  Courtesy of FORD MOTOR CO.
• Are the resistances less than 5 ohms between the navigation system module and the rear view mirror; and are the resistances greater than 10,000 ohms between the navigation system module and ground? 

Result / Action to Take 

Yes 

GO to J5.

No 

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

Test Step 

J5 CHECK CIRCUITS 1196 (DG/WH) AND 1197 (LG/BU) FOR A SHORT TO VOLTAGE 

• Key in ON position.
• Measure the voltage between the navigation system module C4209 pin 7, circuit 1196 (DG/WH), harness side and ground; and between the navigation system module C4209 pin 19, 1197 (LG/BU), harness side and ground.
  Fig 5: Checking Circuits 1196 (DG/WH) And 1197 (LG/BU) For Short To Voltage

  Courtesy of FORD MOTOR CO.
• Is any voltage indicated? 

Result / Action to Take 

Yes 

REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

No 

INSTALL a new rear view mirror. REFER to REAR VIEW MIRRORS . CLEAR the DTCs. REPEAT the self-test.

Test Step 

J6 CHECK FOR CORRECT NAVIGATION SYSTEM MODULE OPERATION 

• Disconnect all navigation system module connectors.
• Check for:
  • corrosion
  • pushed-out pins
• Connect all navigation system module connectors and make sure they seat correctly.
• Operate the system and verify the concern is still present.
• Is the concern still present? 

Result / Action to Take 

Yes 

INSTALL a new navigation system module. REFER to NAVIGATION SYSTEM MODULE  . TEST the system for normal operation.

No 

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.