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, Cluster and Panel Illumination for schematic and connector information. Diagrams By Number
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 dimmable components through circuit VLN04 (VT/GY).
- 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 SJB 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.
- Are any DTCs recorded?
Yes
For DTC B2A32 or DTC B2A33, GO to A5.
No
GO to A2.
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A2 CHECK THE SJB INSTRUMENT PANEL DIMMER SWITCH PID
- 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
GO to A3.
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A3 CHECK THE INSTRUMENT PANEL DIMMER SWITCH
- Carry out the component test for the instrument panel dimmer switch.
- Is the instrument panel dimmer switch OK?
Yes
GO to A4.
No
INSTALL a new instrument panel dimmer switch. REFER to Instrument Panel Dimmer Switch Service and Repair. TEST the system for normal operation.
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A4 CHECK CIRCUIT VLN18 (BU/WH) FOR A SHORT TO GROUND
- Measure the resistance between the instrument panel dimmer switch C2065-6, circuit VLN18 (BU/WH), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to A6.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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A5 CHECK THE ILLUMINATION OUTPUT CIRCUIT VLN04 (VT/GY)
NOTE: If the fuse in the jumper wire fails, repair circuit VLN04 (VT/GY) for a short to ground.
- Ignition OFF.
- Disconnect: SJB C2280b.
- Connect a fused jumper wire between the SJB C2280b-39, circuit VLN04 (VT/GY) and battery positive.
- Do the backlighting components illuminate?
Yes
REMOVE the jumper wire. GO to A6.
No
REMOVE the jumper wire. VERIFY the SJB fuse 10 (15A) is OK. 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. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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A6 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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