Pinpoint Test I: The Doors Do Not Lock/Unlock Using The Keyless Entry Keypad

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

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

I1 CHECK THE DTCs
- Enter the following diagnostic mode on the scan tool: Retrieve DTCs.
- Is DTC B2695, B2696, or B2697 present?
Yes : GO to I2.

No : GO to I4.

I2 CHECK THE KEYPAD INPUT TO THE SJB FOR A SHORT TO GROUND

Key in OFF position.
Disconnect: SJB C2280d.

Measure the resistance between the SJB, harness side and ground as follows:

SJB CONNECTOR-PIN REFERENCE

SJB Connector-Pin	Circuit
C2280d-6	78 (LB/YE)
C2280d-7	79 (LG/RD)
C2280d-8	121 (YE/BK)

Are the resistances greater than 10,000 ohms?

Yes : GO to I7.

No : GO to I3.

I3 CHECK CIRCUITS 78 (LB/YE), 79 (LG/RD) AND 121 (YE/BK) FOR A SHORT TO GROUND

Key in OFF position.
Disconnect: RKE Keypad C500.

Measure the resistance between the SJB, harness side and ground as follows:

SJB CONNECTOR-PIN REFERENCE

SJB Connector-Pin	Circuit
C2280d-6	78 (LB/YE)
C2280d-7	79 (LG/RD)
C2280d-8	121 (YE/BK)

Are the resistances greater than 10,000 ohms?

Yes : INSTALL a new keyless entry RKE keypad. REFER to REMOTE KEYLESS ENTRY KEYPAD in this article.

No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

I4 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN
- Key in OFF position.
- Disconnect: RKE Keypad C500.
- Measure the resistance between the RKE keypad C500-6, circuit 570 (BK/WH), harness side and ground.
  
  Fig 1: Checking Circuit 570 (BK/WH) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to I5.

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

I5 CHECK FOR REFERENCE VOLTAGE SIGNALS TO THE KEYPAD

Measure the voltage between the RKE keypad, harness side and ground as follows:

RKE KEYPAD CONNECTOR-PIN REFERENCE

RKE Keypad Connector-Pin	Circuit
C500-1	78 (LB/YE)
C500-3	79 (LG/RD)
C500-7	121 (YE/BK)

Are the voltages greater than 5 volts?

Yes : INSTALL a new RKE keypad. REFER to REMOTE KEYLESS ENTRY KEYPAD in this article. TEST the system for normal operation

No : GO to I6.

I6 CHECK CIRCUITS 78 (LB/YE), 79 (LG/RD) AND 121 (YE/BK) FOR AN OPEN

Disconnect: SJB C2280d.

Measure the resistance between the SJB, harness side and the RKE keypad, harness side:

SJB CONNECTOR-PIN REFERENCE

SJB Connector-Pin	RKE Keypad Connector-Pin	Circuit
C2280d-6	C500-1	78 (LB/YE)
C2280d-7	C500-3	79 (LG/RD)
C2280d-8	C500-7	121 (YE/BK)

Are the resistances less than 5 ohms?

Yes : GO to I5.

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

I7 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the SJB 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 SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

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.