Pinpoint Test J: The Keyless Entry Keypad Illumination Is Inoperative

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

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

J1 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs
- Key in ON position.
- Retrieve continuous and on-demand DTCs with the scan tool.
- Is DTC B1626 retrieved?
Yes : GO to J2.

No : GO to J4.
J2 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs
- Disconnect: RKE Keypad C500.
- Enter the following diagnostic mode on the scan tool: SJB DTCs.
- Repeat the continuous and on-demand self-test with the scan tool.
- Is DTC B1626 still present?
Yes : GO to J3.

No : INSTALL a new RKE keypad. REFER to REMOTE KEYLESS ENTRY KEYPAD in this article. TEST the system for normal operation.
J3 CHECK CIRCUIT 66 (LB) FOR A SHORT TO GROUND
- Disconnect: SJB C2280d.
- Measure the resistance between the SJB C2280d-23, circuit 66 (LB), harness side and ground.
  
  Fig 1: Checking Circuit 66 (LB) For Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000?
Yes : GO to J8.

No : REPAIR the circuit. RUN the on-demand self-test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all the DTCs. TEST the system for normal operation.
J4 CHECK THE SJB KEYPAD SWITCH PIDs
- Enter the following diagnostic mode on the scan tool: SJB Keypad PIDs.
- Press each keypad button while viewing SJB keypad PIDs.
- Do the PID values agree with the keypad button positions?
Yes : GO to J5.

No : GO to PINPOINT TEST I .
J5 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN
- Disconnect: RKE Keypad C500.
- Measure the resistance between the RKE keypad C500-5, circuit 570 (BK/WH), harness side and ground.
  
  Fig 2: Checking Circuit 570 (BK/WH) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to J6.

No : REPAIR the circuit. TEST the system for normal operation.
J6 CHECK THE SJB OUTPUT FUNCTION
- While measuring the voltage between the RKE keypad C500-2, circuit 66 (LB), harness side and ground, connect a fused (5A) jumper wire between the RKE keypad C500-1, circuit 78 (LB/YE), harness side and the RKE keypad C500-6, circuit 570 (BK/WH), harness side.
  
  Fig 3: Checking SJB Output Function
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts when the jumper wire is connected?
Yes : INSTALL a new RKE keypad. REFER to REMOTE KEYLESS ENTRY KEYPAD in this article. TEST the system for normal operation.

No : REMOVE the jumper wire. GO to J7.
J7 CHECK CIRCUIT 66 (LB) FOR AN OPEN
- Disconnect: SJB C2280d.
- Measure the resistance between the SJB C2280d-23, circuit 66 (LB), harness side and the RKE keypad C500-2, circuit 66 (LB), harness side.
  
  Fig 4: Checking Circuit 66 (LB) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to J8.

No : REPAIR the circuit. TEST the system for normal operation.
J8 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - damaged pins
  - 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 MODULES . 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. RUN the on-demand self-test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all the DTCs. TEST the system for normal operation.