Pinpoint Test M: The Keyless Entry Keypad Illumination Is Inoperative Or Always On

M1 CHECK THE KEYLESS ENTRY KEYPAD ILLUMINATION
NOTE: It is normal operation for the keypad to illuminate when the illuminated entry/exit feature is active. Make sure all the doors are closed and the feature times out.
- Ignition ON.
- Wait 45 seconds and observe the keyless entry keypad illumination.
Is the keyless entry keypad illumination always on?
- Yes : GO to M2 .
- No : GO to M4.
M2 ISOLATE THE RFA MODULE
- Ignition OFF.
- Disconnect: RFA Module C2135D .
- Ignition ON.
Is the keypad still illuminated?
- Yes : GO to M3 .
- No : GO to M10.
M3 CHECK THE RFA MODULE KEYPAD ILLUMINATION OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Keyless Entry Keypad C500 .
- Ignition ON.
- Measure the voltage between the keyless entry keypad C500-2 , circuit CPK28 (WH/GN), harness side and ground.
  
  Fig 1: Measuring Voltage Between Keyless Entry Keypad C500-2 And Ground
  Courtesy of FORD MOTOR CO.
Is any voltage present?
- Yes : REPAIR the circuit.
- No : INSTALL a new keyless entry keypad. REFER to KEYLESS ENTRY KEYPAD .
M4 CHECK THE KEYLESS ENTRY KEYPAD OPERATION
- Press the 7/8 and 9/0 buttons simultaneously on the keyless entry keypad.
Do the doors lock using the keyless entry keypad?
- Yes : GO to M5 .
- No : GO to PINPOINT TEST L .
M5 PERFORM THE RFA MODULE SELF-TEST
- Ignition ON.
- Using a scan tool, perform the RFA module self-test.
Is DTC B121A:11 present?
- Yes : GO to M6 .
- No : GO to M8.
M6 CHECK THE KEYLESS ENTRY KEYPAD FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Keyless Entry Keypad C500 .
- Ignition ON.
- Using a scan tool, clear the DTCs, then repeat the RFA module self-test.
Is DTC B121A:11 still present?
- Yes : GO to M7 .
- No : INSTALL a new keyless entry keypad. REFER to KEYLESS ENTRY KEYPAD .
M7 CHECK THE KEYPAD ILLUMINATION OUTPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: RFA Module C2153D .
- Measure the resistance between the keyless entry keypad C500-2 , circuit CPK28 (WH/GN), harness side and ground.
  
  Fig 2: Measuring Resistance Between Keyless Entry Keypad C500-2 And Ground
  Courtesy of FORD MOTOR CO.
Is the resistance greater than 10, 000 ohms?
- Yes : GO to M10.
- No : REPAIR the circuit.
M8 CHECK THE RFA MODULE OUTPUT
- Ignition OFF.
- Disconnect: Keyless Entry Keypad C500 .
- Ignition ON.
- Using a scan tool, command the RFA module KEYPD_LMP_OS PID on.
- Measure the voltage between the keyless entry keypad C500-2 , circuit CPK28 (WH/GN), harness side and ground.
  
  Fig 3: Measuring Voltage Between Keyless Entry Keypad C500-2 And Ground
  Courtesy of FORD MOTOR CO.
Is the voltage greater than 11 volts?
- Yes : INSTALL a new keyless entry keypad. REFER to KEYLESS ENTRY KEYPAD .
- No : GO to M9 .
M9 CHECK THE BCM KEYPAD ILLUMINATION OUTPUT CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: RFA Module C2153D .
- Measure the resistance between the keyless entry keypad C500-2 , circuit CPK28 (WH/GN), harness side and the RFA module C2153D-10 , circuit CPK28 (WH/GN), harness side.
  
  Fig 4: Measuring Resistance Between Keyless Entry Keypad C500-2 And RFA Module C2153D-10
  Courtesy of FORD MOTOR CO.
Is the resistance less than 3 ohms?
- Yes : GO to M10 .
- No : REPAIR the circuit.
M10 CHECK FOR CORRECT RFA MODULE OPERATION
- Disconnect and inspect all the RFA module connectors.
- Repair:
  - corrosion (install new connector or terminals - clean module pins)
  - damaged or bent pins - install new terminals/pins
  - pushed-out pins - install new pins as necessary
- Reconnect the RFA module connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
- Yes : CHECK On-Line Automotive Service Information System (OASIS) for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new RFA module. REFER to MULTIFUNCTION ELECTRONIC MODULES .
- No : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.