Pinpoint Test N: All Remote Keyless Entry (RKE) Transmitters Are Inoperative

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

N1 CHECK THE FUNCTIONALITY OF ALL RKE TRANSMITTERS
- Press each button on all the transmitters.
- Does any button operate correctly?
Yes : GO to SYMPTOM CHART to continue diagnosis of the RKE transmitter system.

No : GO to N2.
N2 CHECK CIRCUIT 2308 (RD/WH) FOR VOLTAGE
- Key in ON position.
- Measure the voltage by back-probing the antenna C3183-4, circuit 2308 (RD/WH), harness side and ground.
  
  Fig 1: Checking Circuit 2308 (RD/WH) For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 4.5 volts?
Yes : GO to N4.

No : GO to N3.
N3 CHECK CIRCUIT 2308 (RD/WH) FOR AN OPEN OR A SHORT TO GROUND
- Disconnect: Antenna C3183.
- Disconnect: DDM C501c.
- Measure the resistance between the antenna C3183-4, circuit 2308 (RD/WH), harness side and the DDM C501c-4, circuit 2308 (RD/WH), harness side; and between the antenna C3183-4, circuit 2308 (RD/WH), harness side and ground.
  
  Fig 2: Checking Circuit 2308 (RD/WH) For An Open Or A Short To Ground
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms between the antenna and the DDM, and greater than 10,000 ohms between the antenna and ground?
Yes : GO to N4.

No : REPAIR the circuit. TEST the system for normal operation.
N4 CHECK CIRCUIT 2307 (BK/WH) FOR A SHORT TO VOLTAGE
- Disconnect: Antenna C3183.
- Measure the voltage between the antenna C3183-3, circuit 2307 (BK/WH), harness side and ground.
  
  Fig 3: Checking Circuit 2307 (BK/WH) For A Short To Voltage
  Courtesy of FORD MOTOR CO.
- Is there any voltage present?
Yes : REPAIR the circuit. TEST the system for normal operation.

No : GO to N5.
N5 CHECK CIRCUIT 2307 (BK/WH) FOR AN OPEN
- Disconnect: DDM C501c.
- Measure the resistance between the antenna C3183-3, circuit 2307 (BK/WH), harness side and the DDM C501c-3, circuit 2307 (BK/WH), harness side.
  
  Fig 4: Checking Circuit 2307 (BK/WH) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to N6.

No : REPAIR the circuit. TEST the system for normal operation.

N6 CHECK CIRCUITS 2305 (VT/LB), 2306 (GY/RD), AND 2309 (LB/BK) FOR A SHORT TO VOLTAGE

Measure the voltage between the antenna connector, harness side and ground using the following table.

ANTENNA CONNECTOR-PIN REFERENCE

Connector-Pin	Circuit
C3183-1	2305 (VT/LB)
C3183-2	2306 (GY/RD)
C3183-5	2309 (LB/BK)

Is there any voltage present?

Yes : REPAIR the affected circuit. TEST the system for normal operation.

No : GO to N7.

N7 CHECK CIRCUITS 2305 (VT/LB), 2306 (GY/RD) AND 2309 (LB/BK) FOR AN OPEN

Measure the resistance between the antenna connector, harness side and the DDM connector, harness side using the following table.

ANTENNA CONNECTOR-PIN REFERENCE

Connector-Pin	Circuit	Connector-Pin
C3183-1	2305 (VT/LB)	C501d-1
C3183-2	2306 (GY/RD)	C501d-2
C3183-5	2309 (LB/BK)	C501d-5

Are the resistances less than 5 ohms?

Yes : GO to N8.

No : REPAIR the affected circuit. TEST the system for normal operation.

N8 CHECK CIRCUITS 2305 (VT/LB), 2306 (GY/RD) AND 2309 (LB/BK) FOR A SHORT TO GROUND

Measure the resistance between the antenna connector and ground using the following table.

ANTENNA CONNECTOR-PIN REFERENCE

Connector-Pin	Circuit
C3183-1	2305 (VT/LB)
C3183-2	2306 (GY/RD)
C3183-5	2309 (LB/BK)

Are the resistances greater than 10,000 ohms?

Yes : GO to N9.

No : REPAIR the affected circuit. TEST the system for normal operation.

N9 TEST THE SYSTEM WITH A KNOWN GOOD ANTENNA
- Key in OFF position.
- Install a new antenna.
- Key in ON position.
- Test the system for normal operation.
- Does the system operate correctly?
Yes : The system is OK.

No : GO to N10.
N10 CHECK THE DDM FOR CORRECT OPERATION
- Disconnect all the DDM connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the DDM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new DDM. REFER to MULTIFUNCTION ELECTRONIC MODULES . PROGRAM all RKE transmitters. REFER to REMOTE KEYLESS ENTRY TRANSMITTER PROGRAMMING . INFORM the customer that any RKE transmitters not present need to be programmed. CLEAR the DTCs. REPEAT the self-test.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.