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Pinpoint Test A: The Control Illumination Is Inoperative - All Hardwired Illumination

Refer to appropriate SYSTEM WIRING DIAGRAM article for Cluster and Panel Illumination schematic and connector information.

Normal Operation 

Based on input received from the instrument panel dimmer switch, the smart junction box (SJB) sends a pulse-width modulated (PWM) voltage to the hardwired dimmable illumination sources through circuit VLN37 (BU/WH) (MKX) or circuit VLN04 (VT/GY) (Edge).

DTC Description Fault Trigger Conditions
B2A32 - LED Backlighting Output Circuit Open An on-demand DTC that sets when the SJB detects an open on the LED backlighting output circuit.
B2A33 - LED Backlighting Output Circuit Short to Ground A continuous and on-demand DTC that sets when the SJB detects a short to ground on the LED backlighting output circuit. This DTC also sets when fuse 10 (15A) has failed or is removed.
B29B7 - White Lighting Output Circuit Open An on-demand DTC that sets when the SJB detects an open on the white lighting output circuit.
B29B8 - White Lighting Output Circuit Short to Ground A continuous and on-demand DTC that sets when the SJB detects a short to ground on the white lighting output circuit. This DTC also sets when fuse 10 (15A) has failed or is removed.

This pinpoint test is intended to diagnose the following: 

PINPOINT TEST A: THE CONTROL ILLUMINATION IS INOPERATIVE - ALL HARDWIRED ILLUMINATION 

  1. A1 CHECK FOR RECORDED SJB DTCs FROM THE ON-DEMAND SELF-TEST 
    • Use the recorded results from the SJB self-test.
    • Are any DTCs recorded? 
    1. YES  : For DTC B2A33, B2A32, B29B7 or B29B8, go to  A3.
    2. NO  : Go to  A2.
  2. A2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: SJB DataLogger
    • Monitor the SJB PID (DIM_SW_3) while rotating the instrument panel dimmer switch from the lowest setting to the highest setting.
    • Does the PID indicate the switch is operating correctly? 
    1. YES  : Go to  A4.
    2. NO  : INSTALL a new instrument panel dimmer switch. REFER to INSTRUMENT PANEL DIMMER SWITCH . TEST the system for normal operation.
  3. A3 CHECK CIRCUIT VLN37 (BU/WH) OR CIRCUIT VLN04 (VT/GY) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280b
      • Fig 1: Connecting Fused (5A) Jumper Wire Between SJB C2280B-39, Circuit VLN04 (VT/GY) & Battery Positive
      GF0023318Courtesy of FORD MOTOR CO.
      NOTE: If the jumper wire fails, repair circuit VLN04 (VT/GY) for a short to ground.
    • For Edge, connect a fused (5A) jumper wire between the SJB C2280b-39, circuit VLN04 (VT/GY) and battery positive.
      • Fig 2: Connecting Fused (5A) Jumper Wire Between SJB C2280B-52, Circuit VLN37 (BU/WH) & Battery Positive
      GF0023319Courtesy of FORD MOTOR CO.
      NOTE: If the jumper wire fails, repair circuit VLN37 (BU/WH) for a short to ground.
    • For MKX, connect a fused (5A) jumper wire between the SJB C2280b-52, circuit VLN37 (BU/WH) and battery positive.
    • Do the backlighting components illuminate? 
    1. YES  : REMOVE the jumper wire. Go to  A4.
    2. NO  : REMOVE the jumper wire. VERIFY the BJB fuse 10 (15A) is OK. REPAIR the circuit in question for a short to ground. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  4. A4 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? 
    1. YES  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
    2. 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 certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
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