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

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

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

G1 RETRIEVE THE RECORDED VSM DTCs FROM THE ON-DEMAND SELF-TEST
- Check for recorded VSM DTCs from the on-demand self-test.
- Are any DTCs recorded?
1. YES : For DTC B2695, B2696 or B2697, go to G2 .
  For all other VSM DTCs, REFER to Vehicle Security Module (VSM) Diagnostic Trouble Code (DTC) Index in this article.
2. NO : Go to G3.
G2 RERUN THE VSM ON-DEMAND SELF-TEST
- Key in OFF position.
- Disconnect: Keyless Entry Keypad C500
- Key in ON position.
- Erase the DTCs, then rerun the VSM on-demand self-test.
- Is DTC B2695, B2696 or B2697 recorded?
1. YES : Go to G6.
2. NO : INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad in this article. CLEAR the DTCs. REPEAT the self-test.
G3 CHECK THE VSM KEYPAD PID
- Enter the following diagnostic mode on the diagnostic tool: VSM PIDs
- Monitor the KEY_PAD PID while pressing each keyless entry keypad button.
- Do the PID values agree with the keypad button positions?
1. YES : Go to G7.
2. NO : Go to G4.

G4 CHECK THE KEYLESS ENTRY KEYPAD SIGNAL CIRCUITS FOR AN OPEN

Key in OFF position.
Disconnect: Keyless Entry Keypad C500
Disconnect: VSM C3008a

Measure the resistance between the keyless entry keypad C500, harness side and the VSM C3008a, harness side as follows:

Keyless Entry Keypad Connector-Pin	Circuit	VSM Connector-Pin
C500-8	78 (LB/YE)	C3008a-14
C500-6	122 (YE)	C3008a-15
C500-5	123 (RD)	C3008a-16

Fig 1: Checking Keyless Entry Keypad Signal Circuits For Open

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?

YES : Go to G5.
NO : REPAIR the circuit in question. TEST the system for normal operation.

G5 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Measure the resistance between the keyless entry keypad C500-3, circuit 57 (BK), harness side and ground.
  
  Fig 2: Checking Circuit 57 (BK) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
1. YES : INSTALL a new keyless entry keypad. REFER to Keyless Entry Keypad in this article. TEST the system for normal operation.
2. NO : REPAIR the circuit. TEST the system for normal operation.

G6 CHECK THE KEYLESS ENTRY KEYPAD SIGNAL CIRCUITS FOR A SHORT TO GROUND

Key in OFF position.
Disconnect: VSM C3008a

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

VSM Connector-Pin	Circuit
C3008a-14	78 (LB/YE)
C3008a-15	122 (YE)
C3008a-16	123 (RD)

Fig 3: Checking Keyless Entry Keypad Signal Circuits For Short To Ground

Courtesy of FORD MOTOR CO.

Are the resistances greater than 10,000 ohms?

YES : Go to G7.
NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

G7 CHECK FOR CORRECT VSM OPERATION
- Disconnect all the VSM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the VSM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
1. YES : INSTALL a new VSM. REFER to MULTIFUNCTION ELECTRONIC MODULES article. CLEAR the DTCs. REPEAT the VSM self-test.
2. 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.