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

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

N1 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN
- Key in OFF position.
- Disconnect: Remote Keyless Entry (RKE) Keypad C530.
- Measure the resistance between the RKE keypad C530-3, circuit GD126 (BK/WH), harness side and ground.
  
  Fig 1: Checking Circuit GD126 (BK/WH) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to N2.

No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
N2 CHECK CIRCUIT CPK28 (WH) FOR AN OPEN OR A SHORT TO GROUND
- Disconnect: SJB C2280c.
- Measure the resistance between the RKE keypad C530-6, circuit CPK28 (WH), harness side and ground; and between the RKE keypad C530-6, circuit CPK28 (WH), harness side and the SJB C2280C-13, circuit CPK28 (WH), harness side.
  
  Fig 2: Checking Circuit CPK28 (WH) 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 N3.

No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
N3 CHECK THE RKE KEYPAD ILLUMINATION
- Connect: Remote Keyless Entry (RKE) Keypad C530.
- Connect a fused (5A) jumper wire between the SJB C2280c-13, circuit CPK28 (WH), harness side and the positive battery terminal.
  
  Fig 3: Checking RKE Keypad Illumination
  Courtesy of FORD MOTOR CO.
- Does the RKE keypad illuminate?
Yes : GO to N4.

No : INSTALL a new RKE keypad. REFER to REMOTE KEYLESS ENTRY KEYPAD . CLEAR the DTCs. REPEAT the self-test.
N4 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 MULTIFUNCTION ELECTRONIC CONTROL MODULES . CYCLE each key to the ON position for a minimum of 6 seconds to program the RKE function of the integrated keys. 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.