Pinpoint Test A: The Control Illumination Is Inoperative - All Hardwired Illumination
Instrument Cluster and Panel Illumination
Pinpoint Tests
Pinpoint Test A: The Control Illumination Is Inoperative - All Hardwired Illumination
Refer to Wiring Diagram Set 71 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Cluster and Panel Illumination for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) sends a Pulse Width Modulated (PWM) voltage to the dimmable components through circuit VLN04 (VT/GY). Ground is provided through circuits GD112 (BK/GN), GD114 (BK/BU) and GD908 (BK).
- DTC B2A32 (LED Backlighting Output Circuit Open) - an on-demand DTC that sets when the SJB detects an open on the LED backlighting output circuit.
- DTC 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. The DTC also sets as a result when fuse 10 (15A) has failed or is removed.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- SJB
PINPOINT TEST A: THE CONTROL ILLUMINATION IS INOPERATIVE - ALL HARDWIRED ILLUMINATION
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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A1 CHECK FOR RECORDED SJB DTCs FROM THE ON-DEMAND SELF-TEST
- Use the recorded results from the SJB self-test.
- Is DTC B2A32 or B2A33 recorded?
Yes
GO to A3.
No
GO to A2.
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A2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Monitor the SJB dimmer switch 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?
Yes
GO to A4.
No
INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel Dimmer Switch Service and Repair. CLEAR the DTCs. REPEAT the self-test.
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A3 CHECK THE ILLUMINATION OUTPUT CIRCUIT VLN04 (VT/GY)
NOTE: If the fuse in the jumper wire fails, refer to the Wiring Diagrams to identify the possible causes of the circuit short.
- Ignition OFF.
- Disconnect: SJB C2280b.
- Connect a fused jumper wire between the SJB C2280b-39, circuit VLN04 (VT/GY), harness side and battery positive.
- Do the backlighting components illuminate?
Yes
REMOVE the jumper wire. GO to A4.
No
REMOVE the jumper wire. REPAIR the circuit. 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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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?
Yes
INSTALL a new SJB. 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.
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