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

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

B1 CHECK THE VEHICLE SECURITY MODULE KEYPAD SWITCH PIDS
- Enter the following diagnostic mode on the diagnostic tool: Vehicle security module KEYPAD PIDS
- Press each keypad button while viewing vehicle security module KEYPAD PIDS.
- Do the PID values agree with the keypad button positions?
Yes

GO to B5.

No

GO to B2.

B2 CHECK CIRCUITS 78 (LB/YE), 122 (YE) AND 123 (RD) FOR RESISTANCE TO GROUND

Key in OFF position.
Disconnect: Vehicle Security Module C3203f.

Using the following table, measure the resistance between the vehicle security module C3203f harness side and ground:

VEHICLE SECURITY MODULE

Vehicle Security Module C3203f	Circuit
pin 2	78 (LB/YE)
pin 3	123 (RD)
pin 9	122 (YE)

Fig 1: Checking Circuits 78 (LB/YE), 122 (YE) And 123 (RD) For Resistance To Ground

Courtesy of FORD MOTOR CO.

Is any resistance less than 10,000 ohms?

Yes

GO to B3.

GO to B4.

B3 CHECK CIRCUITS 78 (LB/YE), 122 (YE) AND 123 (RD) FOR A SHORT TO GROUND

Disconnect: Keyless Entry Keypad C500.

Using the following table, measure the resistance between the vehicle security module C3203f harness side and ground:

VEHICLE SECURITY MODULE

Vehicle Security Module C3203f	Circuit
pin 2	78 (LB/YE)
pin 3	123 (RD)
pin 9	122 (YE)

Fig 2: Checking Circuits 78 (LB/YE), 122 (YE) And 123 (RD) For A Short To Ground

Courtesy of FORD MOTOR CO.

Is any resistance less than 10,000 ohms?

Yes

REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

INSTALL a new keyless entry keypad. refer to KEYLESS ENTRY KEYPAD . CLEAR the DTCs. REPEAT the self-test.

B4 CHECK CIRCUITS 78 (LB/YE), 122 (YE), 123 (RD) AND 124 (BR) FOR AN OPEN

Disconnect: Keyless Entry Keypad C500.

Using the following table, measure the resistance between the vehicle security module C3203f, harness side and keyless entry keypad C500, harness side:

VEHICLE SECURITY MODULE

Vehicle Security Module C3203f	Circuit	Keyless entry keypad C500
pin 2	78 (LB/YE)	pin 1
pin 3	123 (RD)	pin 7
pin 4	124 (BN)	pin 6
pin 9	122 (YE)	pin 3

Fig 3: Checking Circuits 78 (LB/YE), 122 (YE), 123 (RD) And 124 (BR) For An Open

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?

Yes

INSTALL a new keyless entry keypad. refer to KEYLESS ENTRY KEYPAD . CLEAR the DTCs. REPEAT the self-test.

REPAIR the circuit(s). CLEAR the DTCs. REPEAT the self-test.

B5 CHECK FOR CORRECT VEHICLE SECURITY MODULE OPERATION
- Disconnect all vehicle security module connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all vehicle security module 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 vehicle security module. REFER to MODULE COMMUNICATIONS NETWORK . CLEAR the DTCs. REPEAT the vehicle security module self-test.

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.