Test B: Doors Do Not Lock Or Unlock Using Keypad

1. Unlock driver's door with keypad code obtained from vehicle owner. Ensure keypad and interior lights illuminate with first button press. Press 3/4 button within 5 seconds of unlocking driver's doors with keypad code to unlock all doors. Press 7/8 and 9/0 button to lock all doors, and turn off keypad and interior lights. If system operates as specified, no problem is indicated at this time. If keypad code did not work, go to next step. If keypad illuminates but interior lights do not illuminate when buttons are pressed, go to TEST G: ILLUMINATED ENTRY DOES NOT OPERATE USING REMOTE TRANSMITTER . If doors unlock but keypad does not illuminate, go to step  7. If only one keypad button does not seem to function, go to step  5.
2. Connect Next Generation Star (NGS) tester following manufacturers instructions. Retrieve continuous DTCs. Clear DTCs. Perform RAP self-test. If no DTCs are retrieved, go to step  4. If DTC B1526 is retrieved, go to next step.
3. Using NGS tester, select RAP PID KEY_PAD. If display shows any buttons active, go to step  11. If display shows no buttons active, go to next step.
4. Using NGS tester, select RAP PID KEY_CODE. Ensure displayed keycode matches vehicle owners keycode. If keycodes match, go to next step. If keycodes do not match, inform vehicle owner of correct keycode to use. Repeat step  1.
5. With RAP PID KEY_PAD selected, ensure numbers do not display when keypad buttons are not pressed. Press all keypad buttons separately. Display should show only button being pressed. Display will show only odd numbers of each keypad button. If keypad does not operate as specified, go to next step. If keypad operates as specified, replace RAP module. Recheck system operation.
6. Turn ignition off. Disconnect RAP module 26-pin connector C336 and keypad connector. Measure resistance in circuits between keypad connector and RAP module 26-pin connector C336 as specified. See KEYLESS ENTRY CIRCUIT CONTINUITY  table. See Figure and Fig 1 . If resistance is less than 5 ohms in all circuits, replace keypad. Clear DTCs and retest system. If resistance is more than 5 ohms, repair suspect circuit(s). See WIRING DIAGRAMS . Clear DTCs and retest system.
   KEYLESS ENTRY CIRCUIT CONTINUITY
   
   

   RAP Connector C336 Terminal No.	Keypad Connector C516 Terminal No.	Wire Color
   5	3	Light Blue/Yellow
   6	4	Light Green/Red
   19	5	Yellow/Black
   7	6	Yellow
   8	1	Red
   15	8	Brown

7. Using NGS tester, enter ACTIVE COMMAND MODES. Select KEYPAD BACK LIGHTING. Turn keypad backlighting ON using NGS tester. If keypad does not illuminate, go to next step. If keypad illuminates, repeat step  5.
8. Turn ignition off. Disconnect RAP module 22-pin connector C338. Check for continuity between ground and RAP module 22-pin connector C338 terminal No. 15 (Light Blue wire). See Figure. If continuity does not exist, go to next step. If continuity exists, replace RAP module.
9. Disconnect keypad connector. Measure resistance of Light Blue wire between RAP module 22-pin connector C338 terminal No. 15 and keypad connector terminal No. 7. See Figure and Fig 1 . If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Light Blue wire. Recheck system operation.
10. Measure resistance between ground and keypad connector terminal No. 2 (Black wire). Fig 1. If resistance is less than 5 ohms, replace keypad. Retest system. If resistance is more than 5 ohms, repair open in Black wire. Install keypad connector. Retest system.
11. Turn ignition off. Disconnect RAP module 26-pin connector C336. Measure resistance between RAP module 22-pin connector C338 terminal No. 14 (Black/White wire) and specified RAP module 26-pin connector C336 terminals. See KEYPAD CIRCUIT IDENTIFICATION  table. See Figure. If resistance's are more than 10 k/ohms, replace RAP module. Retest system. If resistance's are less than 10 k/ohms, go to next step.
12. Disconnect keypad connector Measure resistance between RAP module 22-pin connector C338 terminal No. 14 (Black/White wire) and specified RAP module 26-pin connector C336 terminals. See KEYPAD CIRCUIT IDENTIFICATION  table. See Figure. If resistance's are more than 10 k/ohms, replace keypad. Clear DTCs and retest system. If resistance's are less than 10 k/ohms, repair suspect circuit(s). Clear DTCs and retest system.

KEYPAD CIRCUIT IDENTIFICATION

RAP Module Connector C336 Terminal No.	Wire Color
5	Light Blue/Yellow
6	Light Green/Red
7	Yellow
8	Red
19	Yellow/Black

Fig 1: Identifying Keypad Terminals

Courtesy of FORD MOTOR CO.