Pinpoint Test L: The Remote Keyless Entry (RKE) Keypad Illumination Is Inoperative

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

L1 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Key in OFF position.
- Disconnect: RKE Keypad C500.
- Measure the resistance between the RKE keypad C500-6, circuit 1205 (BK), harness side and ground.
  
  Fig 1: Measuring Resistance Between RKE Keypad C500-6, Circuit 1205 (BK), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: GO to L2.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
L2 CHECK CIRCUIT 66 (LB) FOR AN OPEN OR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB C2280c.
- Measure the resistance between the RKE keypad C500-2, circuit 66 (LB), harness side and ground; and between the RKE keypad C500-2, circuit 66 (LB), harness side and the SJB C2280c-12, circuit 66 (LB), harness side.
  
  Fig 2: Checking Circuit 66 (LB) For Open Or Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms between the RKE keypad and ground, and less than 5 ohms between the RKE keypad and the SJB?
Yes: GO to L3.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
L3 CHECK THE RKE KEYPAD ILLUMINATION
- Connect: RKE Keypad C500.
- Connect a fused (5A) jumper wire between the SJB C2280c-12, circuit 66 (LB), harness side and the positive battery terminal.
  
  Fig 3: Connecting Fused (5A) Jumper Wire Between SJB C2280c-12, Circuit 66 (LB), Harness Side & Positive Battery Terminal
  Courtesy of FORD MOTOR CO.
- Does the RKE keypad illuminate?
Yes: GO to L4.

No: INSTALL a new RKE keypad. refer to REMOTE KEYLESS ENTRY KEYPAD . CLEAR the DTCs. REPEAT the self-test.
L4 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - 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 REMOVAL AND INSTALLATION . PROGRAM all the RKE transmitters. REFER to REMOTE KEYLESS ENTRY TRANSMITTER PROGRAMMING . INFORM the customer that any RKE transmitters not present need to be programmed. 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.